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• Error whilst starting rails server

  - by Sajeer

  I am new to rails and the bundle install works fine for the project. but when I start the rails server errors are shown.The shown errors are attached herewith. Exiting C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in `parse': (): could not find e xpected ':' while scanning a simple key at line 27 column 3 (Psych::SyntaxError) from C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in `parse_stream' from C:/Ruby193/lib/ruby/1.9.1/psych.rb:151:in `parse' from C:/Ruby193/lib/ruby/1.9.1/psych.rb:127:in `load' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/applic ation/configuration.rb:115:in database_configuration' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.2/lib/active_r ecord/railtie.rb:75:inblock (2 levels) in ' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_ support/lazy_load_hooks.rb:36:in instance_eval' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_ support/lazy_load_hooks.rb:36:inexecute_hook' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_ support/lazy_load_hooks.rb:26:in on_load' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.2/lib/active_r ecord/railtie.rb:74:inblock in ' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initia lizable.rb:30:in instance_exec' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initia lizable.rb:30:inrun' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initia lizable.rb:55:in block in run_initializers' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initia lizable.rb:54:ineach' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initia lizable.rb:54:in run_initializers' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/applic ation.rb:136:ininitialize!' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/railti e/configurable.rb:30:in method_missing' from D:/ROR/appmallserver/config/environment.rb:22:in' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_ support/dependencies.rb:251:in require' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_ support/dependencies.rb:251:inblock in require' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_ support/dependencies.rb:236:in load_dependency' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_ support/dependencies.rb:251:inrequire' from D:/ROR/appmallserver/config.ru:4:in block in <main>' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb: 51:ininstance_eval' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb: 51:in initialize' from D:/ROR/appmallserver/config.ru:1:innew' from D:/ROR/appmallserver/config.ru:1:in <main>' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb: 40:ineval' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb: 40:in parse_file' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:2 00:inapp' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/comman ds/server.rb:46:in app' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:3 01:inwrapped_app' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:2 52:in start' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/comman ds/server.rb:70:instart' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/comman ds.rb:55:in block in <top (required)>' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/comman ds.rb:50:intap' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/comman ds.rb:50:in <top (required)>' from script/rails:21:inrequire' from script/rails:21:in `'

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• Bug in CF9: values for unique struct keys referenced and overwritten by other keys.

  - by Gin Doe

  We've run into a serious issue with CF9 wherein values for certain struct keys can be referenced by other keys, despite those other keys never being set. See the following examples: Edit: Looks like it isn't just something our servers ate. This is Adobe bug-track ticket 81884: http://cfbugs.adobe.com/cfbugreport/flexbugui/cfbugtracker/main.html#bugId=81884. <cfset a = { AO = "foo" } /> <cfset b = { AO = "foo", B0 = "bar" } /> <cfoutput> The following should throw an error. Instead both keys refer to the same value. <br />Struct a: <cfdump var="#a#" /> <br />a.AO: #a.AO# <br />a.B0: #a.B0# <hr /> The following should show a struct with 2 distinct keys and values. Instead it contains a single key, "AO", with a value of "bar". <br />Struct b: <cfdump var="#b#" /> This is obviously a complete show-stopper for us. I'd be curious to know if anyone has encountered this or can reproduce this in their environment. For us, it happens 100% of the time on Apache/CF9 running on Linux, both RH4 and RH5. We're using the default JRun install on Java 1.6.0_14. To see the extent of the problem, we ran a quick loop to find other naming sequences that are affected and found hundreds of matches for 2 letter key names. A similar loop found more conflicts in 3 letter names. <cfoutput>Testing a range of affected key combinations. This found hundreds of cases on our platform. Aborting after 50 here.</cfoutput> <cfscript> teststring = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; stringlen = len(teststring); matchesfound = 0; matches = ""; for (i1 = 1; i1 <= stringlen; i1++) { symbol1 = mid(teststring, i1, 1); for (i2 = 1; i2 <= stringlen; i2++) { teststruct = structnew(); symbol2 = mid(teststring, i2, 1); symbolwhole = symbol1 & symbol2; teststruct[ symbolwhole ] = "a string"; for (q1 = 1; q1 <= stringlen; q1++) { innersymbol1 = mid(teststring, q1, 1); for (q2 = 1; q2 <= stringlen; q2++) { innersymbol2 = mid(teststring, q2, 1); innersymbolwhole = innersymbol1 & innersymbol2; if ((i1 != q1 || i2 != q2) && structkeyexists(teststruct, innersymbolwhole)) { // another affected pair of keys! writeoutput ("<br />#symbolwhole# = #innersymbolwhole#"); if (matchesfound++ > 50) { // we've seen enough abort; } } } } } } </cfscript> And edit again: This doesn't just affect struct keys but names in the variables scope as well. At least the variables scope has the presence of mind to throw an error, "can't load a null": <cfset test_b0 = "foo" /> <cfset test_ao = "bar" /> <cfoutput> test_b0: #test_b0# <br />test_ao: #test_ao# </cfoutput>

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• System.InvalidOperationException: Unable to generate a temporary class (result=1).

  - by keepsmilinyaar

  Hi, I have developed an application using .net 3.5 and have deployed it as an .exe on a number of machines with the same environment. However, on one particular machine I get the following error. Am puttin in the Stack Trace. See the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box. ********** Exception Text ********** System.InvalidOperationException: Unable to generate a temporary class (result=1). error CS2001: Source file 'C:\WINDOWS\TEMP\wz58eig4.0.cs' could not be found error CS2008: No inputs specified at System.Xml.Serialization.Compiler.Compile(Assembly parent, String ns, XmlSerializerCompilerParameters xmlParameters, Evidence evidence) at System.Xml.Serialization.TempAssembly.GenerateAssembly(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, Evidence evidence, XmlSerializerCompilerParameters parameters, Assembly assembly, Hashtable assemblies) at System.Xml.Serialization.TempAssembly..ctor(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, String location, Evidence evidence) at System.Xml.Serialization.XmlSerializer.GetSerializersFromCache(XmlMapping[] mappings, Type type) at System.Xml.Serialization.XmlSerializer.FromMappings(XmlMapping[] mappings, Type type) at System.Web.Services.Protocols.SoapClientType..ctor(Type type) at System.Web.Services.Protocols.SoapHttpClientProtocol..ctor() at SSOClient..ctor() at sc.tradesvc.SSOManager..ctor() at sc.tradesvc.SSOManager.get_Inst() at sc.cashflowgenerator.Controls.LoginForm.btnLogin_Click(Object sender, EventArgs e) at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnClick(EventArgs e) at System.Windows.Forms.Button.PerformClick() at System.Windows.Forms.Form.ProcessDialogKey(Keys keyData) at System.Windows.Forms.TextBoxBase.ProcessDialogKey(Keys keyData) at System.Windows.Forms.Control.PreProcessMessage(Message& msg) at System.Windows.Forms.Control.PreProcessControlMessageInternal(Control target, Message& msg) at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg) ********** Loaded Assemblies ********** mscorlib Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400) CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll CashflowGenerator Assembly Version: 1.0.0.0 Win32 Version: 1.0.0.0 CodeBase: file:///C:/DATA/DEVEL/Output/CashflowGenerator.exe System.Windows.Forms Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400) CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll System Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400) CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll System.Drawing Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400) CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll System.Configuration Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400) CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll System.Xml Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400) CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll System.Core Assembly Version: 3.5.0.0 Win32 Version: 3.5.21022.8 built by: RTM CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll System.Web.Services Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400) CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Web.Services/2.0.0.0__b03f5f7f11d50a3a/System.Web.Services.dll ********** JIT Debugging ********** To enable just-in-time (JIT) debugging, the .config file for this application or computer (machine.config) must have the jitDebugging value set in the system.windows.forms section. The application must also be compiled with debugging enabled. For example: When JIT debugging is enabled, any unhandled exception will be sent to the JIT debugger registered on the computer rather than be handled by this dialog box. Could someone help me with this? As I am new to .net could someone also tell me when why a temporary class needs to be created in the first place? Thank you very much.

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• DataTable to JSON

  - by Joel Coehoorn

  I recently needed to serialize a datatable to JSON. Where I'm at we're still on .Net 2.0, so I can't use the JSON serializer in .Net 3.5. I figured this must have been done before, so I went looking online and found a number of different options. Some of them depend on an additional library, which I would have a hard time pushing through here. Others require first converting to List<Dictionary<>>, which seemed a little awkward and needless. Another treated all values like a string. For one reason or another I couldn't really get behind any of them, so I decided to roll my own, which is posted below. As you can see from reading the //TODO comments, it's incomplete in a few places. This code is already in production here, so it does "work" in the basic sense. The places where it's incomplete are places where we know our production data won't currently hit it (no timespans or byte arrays in the db). The reason I'm posting here is that I feel like this can be a little better, and I'd like help finishing and improving this code. Any input welcome. public static class JSONHelper { public static string FromDataTable(DataTable dt) { string rowDelimiter = ""; StringBuilder result = new StringBuilder("["); foreach (DataRow row in dt.Rows) { result.Append(rowDelimiter); result.Append(FromDataRow(row)); rowDelimiter = ","; } result.Append("]"); return result.ToString(); } public static string FromDataRow(DataRow row) { DataColumnCollection cols = row.Table.Columns; string colDelimiter = ""; StringBuilder result = new StringBuilder("{"); for (int i = 0; i < cols.Count; i++) { // use index rather than foreach, so we can use the index for both the row and cols collection result.Append(colDelimiter).Append("\"") .Append(cols[i].ColumnName).Append("\":") .Append(JSONValueFromDataRowObject(row[i], cols[i].DataType)); colDelimiter = ","; } result.Append("}"); return result.ToString(); } // possible types: // http://msdn.microsoft.com/en-us/library/system.data.datacolumn.datatype(VS.80).aspx private static Type[] numeric = new Type[] {typeof(byte), typeof(decimal), typeof(double), typeof(Int16), typeof(Int32), typeof(SByte), typeof(Single), typeof(UInt16), typeof(UInt32), typeof(UInt64)}; // I don't want to rebuild this value for every date cell in the table private static long EpochTicks = new DateTime(1970, 1, 1).Ticks; private static string JSONValueFromDataRowObject(object value, Type DataType) { // null if (value == DBNull.Value) return "null"; // numeric if (Array.IndexOf(numeric, DataType) > -1) return value.ToString(); // TODO: eventually want to use a stricter format // boolean if (DataType == typeof(bool)) return ((bool)value) ? "true" : "false"; // date -- see http://weblogs.asp.net/bleroy/archive/2008/01/18/dates-and-json.aspx if (DataType == typeof(DateTime)) return "\"\\/Date(" + new TimeSpan(((DateTime)value).ToUniversalTime().Ticks - EpochTicks).TotalMilliseconds.ToString() + ")\\/\""; // TODO: add Timespan support // TODO: add Byte[] support //TODO: this would be _much_ faster with a state machine // string/char return "\"" + value.ToString().Replace(@"\", @"\\").Replace(Environment.NewLine, @"\n").Replace("\"", @"\""") + "\""; } }

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• Ant + JUnit: NoClassDefFoundError

  - by K-Boo

  Ok, I'm frustrated! I've hunted around for a good number of hours and am still stumped. Environment: WinXP, Eclipse Galileo 3.5 (straight install - no extra plugins). So, I have a simple JUnit test. It runs fine from it's internal Eclipse JUnit run configuration. This class has no dependencies on anything. To narrow this problem down as much as possible it simply contains: @Test public void testX() { assertEquals("1", new Integer(1).toString()); } No sweat so far. Now I want to take the super advanced step of running this test case from within Ant (the final goal is to integrate with Hudson). So, I create a build.xml: <project name="Test" default="basic"> <property name="default.target.dir" value="${basedir}/target" /> <property name="test.report.dir" value="${default.target.dir}/test-reports" /> <target name="basic"> <mkdir dir="${test.report.dir}" /> <junit fork="true" printSummary="true" showOutput="true"> <formatter type="plain" /> <classpath> <pathelement path="${basedir}/bin "/> </classpath> <batchtest fork="true" todir="${test.report.dir}" > <fileset dir="${basedir}/bin"> <include name="**/*Test.*" /> </fileset> </batchtest> </junit> </target> </project> ${basedir} is the Java project name in the workspace that contains the source, classes and build file. All .java's and the build.xml are in ${basedir}/src. The .class files are in ${basedir}/bin. I have added eclipse-install-dir/plugins/org.junit4_4.5.0.v20090423/junit.jar to the Ant Runtime Classpath via Windows / Preferences / Ant / Runtime / Contributed Entries. ant-junit.jar is in Ant Home Entries. So, what happens when I run this insanely complex target? My report file contains: Testsuite: com.xyz.test.RussianTest Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 0 sec Testcase: initializationError took 0 sec Caused an ERROR org/hamcrest/SelfDescribing java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$000(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) Caused by: java.lang.ClassNotFoundException: org.hamcrest.SelfDescribing at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) What is this org.hamcrest.SelfDescribing class? Something to do with mocks? OK, fine. But why the dependency? I'm not doing anything at all with it. This is literally a Java project with no dependencies other than JUnit. Stumped (and frustrated)!!

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• Paging, sorting and filtering in a stored procedure (SQL Server)

  - by Fruitbat

  I was looking at different ways of writing a stored procedure to return a "page" of data. This was for use with the asp ObjectDataSource, but it could be considered a more general problem. The requirement is to return a subset of the data based on the usual paging paremeters, startPageIndex and maximumRows, but also a sortBy parameter to allow the data to be sorted. Also there are some parameters passed in to filter the data on various conditions. One common way to do this seems to be something like this: [Method 1] ;WITH stuff AS ( SELECT CASE WHEN @SortBy = 'Name' THEN ROW_NUMBER() OVER (ORDER BY Name) WHEN @SortBy = 'Name DESC' THEN ROW_NUMBER() OVER (ORDER BY Name DESC) WHEN @SortBy = ... ELSE ROW_NUMBER() OVER (ORDER BY whatever) END AS Row, ., ., ., FROM Table1 INNER JOIN Table2 ... LEFT JOIN Table3 ... WHERE ... (lots of things to check) ) SELECT * FROM stuff WHERE (Row > @startRowIndex) AND (Row <= @startRowIndex + @maximumRows OR @maximumRows <= 0) ORDER BY Row One problem with this is that it doesn't give the total count and generally we need another stored procedure for that. This second stored procedure has to replicate the parameter list and the complex WHERE clause. Not nice. One solution is to append an extra column to the final select list, (SELECT COUNT(*) FROM stuff) AS TotalRows. This gives us the total but repeats it for every row in the result set, which is not ideal. [Method 2] An interesting alternative is given here (http://www.4guysfromrolla.com/articles/032206-1.aspx) using dynamic SQL. He reckons that the performance is better because the CASE statement in the first solution drags things down. Fair enough, and this solution makes it easy to get the totalRows and slap it into an output parameter. But I hate coding dynamic SQL. All that 'bit of SQL ' + STR(@parm1) +' bit more SQL' gubbins. [Method 3] The only way I can find to get what I want, without repeating code which would have to be synchronised, and keeping things reasonably readable is to go back to the "old way" of using a table variable: DECLARE @stuff TABLE (Row INT, ...) INSERT INTO @stuff SELECT CASE WHEN @SortBy = 'Name' THEN ROW_NUMBER() OVER (ORDER BY Name) WHEN @SortBy = 'Name DESC' THEN ROW_NUMBER() OVER (ORDER BY Name DESC) WHEN @SortBy = ... ELSE ROW_NUMBER() OVER (ORDER BY whatever) END AS Row, ., ., ., FROM Table1 INNER JOIN Table2 ... LEFT JOIN Table3 ... WHERE ... (lots of things to check) SELECT * FROM stuff WHERE (Row > @startRowIndex) AND (Row <= @startRowIndex + @maximumRows OR @maximumRows <= 0) ORDER BY Row (Or a similar method using an IDENTITY column on the table variable). Here I can just add a SELECT COUNT on the table variable to get the totalRows and put it into an output parameter. I did some tests and with a fairly simple version of the query (no sortBy and no filter), method 1 seems to come up on top (almost twice as quick as the other 2). Then I decided to test probably I needed the complexity and I needed the SQL to be in stored procedures. With this I get method 1 taking nearly twice as long as the other 2 methods. Which seems strange. Is there any good reason why I shouldn't spurn CTEs and stick with method 3? UPDATE - 15 March 2012 I tried adapting Method 1 to dump the page from the CTE into a temporary table so that I could extract the TotalRows and then select just the relevant columns for the resultset. This seemed to add significantly to the time (more than I expected). I should add that I'm running this on a laptop with SQL Server Express 2008 (all that I have available) but still the comparison should be valid. I looked again at the dynamic SQL method. It turns out I wasn't really doing it properly (just concatenating strings together). I set it up as in the documentation for sp_executesql (with a parameter description string and parameter list) and it's much more readable. Also this method runs fastest in my environment. Why that should be still baffles me, but I guess the answer is hinted at in Hogan's comment.

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• Debugging EXC_BAD_ACCESS that occurs only on release target for an iPhone app?

  - by Bobby Moretti

  I'm developing an iPhone application. I have an EXC_BAD_ACCESS that occurs only in the release target; when I build the debug target the exception does not occur. However, when I set the NSZombieEnabled environment variable to YES, I still get the EXC_BAD_ACCESS with no further information. Is it even possible for NSZombieEnabled to work when executing the release target? I don't see why not, since gdb is running in both cases... Update: here is a printout of the top of the stack: #0 0x33369ebc in objc_msgSend () #1 0x3144f968 in -[EAInputStream _streamEventTrigger] () #2 0x3144fe78 in __streamEventTrigger () #3 0x338ae3a6 in CFRunLoopRunSpecific () #4 0x338adc1e in CFRunLoopRunInMode () #5 0x32ed6966 in -[NSRunLoop(NSRunLoop) runMode:beforeDate:] () #6 0x00005b06 in -[IOStreamDelegate removeMsg:] (self=0x142cc0, _cmd=<value temporarily unavailable, due to optimizations>, message=0x2fffe544) at /Users/robertmoretti/Documents/XXXXXXX/IOStreamDelegate.m:191 Here is a gdb session from inside the objc_msgSend call at the top: (gdb) p/x $r0 $6 = 0x3100000 (gdb) x/s $r1 0x32d7cff8: "release" (gdb) disassemble $pc Dump of assembler code for function objc_msgSend: 0x33369ea8 <objc_msgSend+0>: teq r0, #0 ; 0x0 0x33369eac <objc_msgSend+4>: moveq r1, #0 ; 0x0 0x33369eb0 <objc_msgSend+8>: bxeq lr 0x33369eb4 <objc_msgSend+12>: push {r3, r4, r5, r6} 0x33369eb8 <objc_msgSend+16>: ldr r4, [r0] 0x33369ebc <objc_msgSend+20>: ldr r5, [r4, #8] 0x33369ec0 <objc_msgSend+24>: ldr r6, [r5] 0x33369ec4 <objc_msgSend+28>: add r3, r5, #8 ; 0x8 0x33369ec8 <objc_msgSend+32>: and r5, r6, r1, lsr #2 0x33369ecc <objc_msgSend+36>: ldr r4, [r3, r5, lsl #2] 0x33369ed0 <objc_msgSend+40>: teq r4, #0 ; 0x0 0x33369ed4 <objc_msgSend+44>: add r5, r5, #1 ; 0x1 0x33369ed8 <objc_msgSend+48>: beq 0x33369efc <objc_msgSend+84> 0x33369edc <objc_msgSend+52>: ldr r12, [r4] 0x33369ee0 <objc_msgSend+56>: teq r1, r12 0x33369ee4 <objc_msgSend+60>: and r5, r5, r6 0x33369ee8 <objc_msgSend+64>: bne 0x33369ecc <objc_msgSend+36> 0x33369eec <objc_msgSend+68>: ldr r12, [r4, #8] 0x33369ef0 <objc_msgSend+72>: teq r4, r4 0x33369ef4 <objc_msgSend+76>: pop {r3, r4, r5, r6} 0x33369ef8 <objc_msgSend+80>: bx r12 0x33369efc <objc_msgSend+84>: pop {r3, r4, r5, r6} 0x33369f00 <objc_msgSend+88>: b 0x33369f04 <objc_msgSend_uncached> End of assembler dump. (gdb) p/x *$r0 $9 = 0x0 The exception occurs on the line 0x33369ebc <objc_msgSend+20>: ldr r5, [r4, #8]. r4 has just been given the value pointed to by r0, which happens to be 0. I am wondering what is supposed to be in the memory region of 0x3100000. Here's a memory dump of that area: (gdb) x/256w 0x3100000 0x3100000: 0x00000000 0x0000a293 0xaa650505 0x00000000 0x3100010: 0x0000a294 0xaa670505 0x00000000 0x0000a295 0x3100020: 0xaa690505 0x00000000 0x0000a296 0xaa6b0505 0x3100030: 0x00000000 0x0000a297 0xaa6d0505 0x00000000 0x3100040: 0x0000a298 0xaa6f0505 0x00000000 0x0000a299 0x3100050: 0xaa710505 0x00000000 0x0000a29a 0xaa730505 0x3100060: 0x00000000 0x0000a29b 0xaa750505 0x00000000 0x3100070: 0x0000a29c 0xaa770505 0x00000000 0x0000a29d 0x3100080: 0xaa790505 0x00000000 0x0000a29e 0xaa7b0505 0x3100090: 0x00000000 0x0000a29f 0xaa7d0505 0x00000000 0x31000a0: 0x0000a2a0 0xaa7f0505 0x00000000 0x0000a2a1 0x31000b0: 0xaa810505 0x00000000 0x0000a2a2 0xaa830505 0x31000c0: 0x00000000 0x0000a2a3 0xaa850505 0x00000000 0x31000d0: 0x0000a2a4 0xaa870505 0x00000000 0x0000a2a5 0x31000e0: 0xaa890505 0x00000000 0x0000a2a6 0xaa8b0505 0x31000f0: 0x00000000 0x0000a2a7 0xaa8d0505 0x00000000 0x3100100: 0x0000a2a8 0xaa8f0505 0x00000000 0x0000a2a9 0x3100110: 0xaa910505 0x00000000 0x0000a2aa 0xaa930505 0x3100120: 0x00000000 0x0000a2ab 0xaa950505 0x00000000 0x3100130: 0x0000a2ac 0xaa970505 0x00000000 0x0000a2ad 0x3100140: 0xaa990505 0x00000000 0x0000a2ae 0xaa9b0505 0x3100150: 0x00000000 0x0000a2af 0xaa9d0505 0x00000000 0x3100160: 0x0000a2b0 0xaa9f0505 0x00000000 0x0000a2b1 0x3100170: 0xaaa10505 0x00000000 0x0000a2b2 0xaaa30505 0x3100180: 0x00000000 0x0000a2b3 0xaaa50505 0x00000000 0x3100190: 0x0000a2b4 0xaaa70505 0x00000000 0x0000a2b5 0x31001a0: 0xaaa90505 0x00000000 0x0000a2b6 0xaaab0505 0x31001b0: 0x00000000 0x0000a2b7 0xaaad0505 0x00000000 0x31001c0: 0x0000a2b8 0xaaaf0505 0x00000000 0x0000a2b9 0x31001d0: 0xaab10505 0x00000000 0x0000a2ba 0xaab30505 0x31001e0: 0x00000000 0x0000a2bb 0xaab50505 0x00000000 0x31001f0: 0x0000a2bc 0xaab70505 0x00000000 0x0000a2bd 0x3100200: 0xaab90505 0x00000000 0x0000a2be 0xaabb0505 0x3100210: 0x00000000 0x0000a2bf 0xaabd0505 0x00000000 0x3100220: 0x0000a2c0 0xaabf0505 0x00000000 0x0000a2c1 0x3100230: 0xaac10505 0x00000000 0x0000a2c2 0xaac30505 0x3100240: 0x00000000 0x0000a2c3 0xaac50505 0x00000000 0x3100250: 0x0000a2c4 0xaac70505 0x00000000 0x0000a2c5 0x3100260: 0xaac90505 0x00000000 0x0000a2c6 0xaacb0505 0x3100270: 0x00000000 0x0000a2c7 0xaacd0505 0x00000000 0x3100280: 0x0000a2c8 0xaacf0505 0x00000000 0x0000a2c9 0x3100290: 0xaad10505 0x00000000 0x0000a2ca 0xaad30505 0x31002a0: 0x00000000 0x0000a2cb 0xaad50505 0x00000000 0x31002b0: 0x0000a2cc 0xaad70505 0x00000000 0x0000a2cd 0x31002c0: 0xaad90505 0x00000000 0x0000a2ce 0xaadb0505 0x31002d0: 0x00000000 0x0000a2cf 0xaadd0505 0x00000000 0x31002e0: 0x0000a2d0 0xaadf0505 0x00000000 0x0000a2d1 0x31002f0: 0xaae10505 0x00000000 0x0000a2d2 0xaae30505 0x3100300: 0x00000000 0x0000a2d3 0xaae50505 0x00000000 0x3100310: 0x0000a2d4 0xaae70505 0x00000000 0x0000a2d5 0x3100320: 0xaae90505 0x00000000 0x0000a2d6 0xaaeb0505 0x3100330: 0x00000000 0x0000a2d7 0xaaed0505 0x00000000 0x3100340: 0x0000a2d8 0xaaef0505 0x00000000 0x0000a2d9 0x3100350: 0xaaf10505 0x00000000 0x0000a2da 0xaaf30505 0x3100360: 0x00000000 0x0000a2db 0xaaf50505 0x00000000 0x3100370: 0x0000a2dc 0xaaf70505 0x00000000 0x0000a2dd 0x3100380: 0xaaf90505 0x00000000 0x0000a2de 0xaafb0505 0x3100390: 0x00000000 0x0000a2df 0xaafd0505 0x00000000 0x31003a0: 0x0000a2e0 0xab050505 0x00000000 0x0000a2e1 0x31003b0: 0xab070505 0x00000000 0x0000a2e2 0xab090505 0x31003c0: 0x00000000 0x0000a2e3 0xab0b0505 0x00000000 0x31003d0: 0x0000a2e4 0xab0d0505 0x00000000 0x0000a2e5 0x31003e0: 0xab0f0505 0x00000000 0x0000a2e6 0xab110505 0x31003f0: 0x00000000 0x0000a2e7 0xab130505 0x00000000 I don't really know what else to try; hopefully someone with more iphone experience will be able to recognize this memory as something meaningful.

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• design suggestion for a message decoder in delphi

  - by stanleyxu2005

  Hi All, I want to implement a RPC module. Different requests are encoded as JSON objects. They will be decoded and then be handled by a request handler. At last a corresponding response will be returned. The demo code looks as follows: type IRequestHandler = interface function Handle(const Request: TAaaRequest): TResponse; function Handle(const Request: TBbbRequest): TResponse; end; TDecoder = class class function Decode(const Json: TJsonObject; const RequestHandler: IRequestHandler): TResponse; end; class function TDecoder.Decode(const Json: TJsonObject; const RequestHandler: IRequestHandler): TResponse; var Method: string; Request: TObject; begin Method := Json['method'].AsString; if (Method = TAaaRequest.ClassName) then begin Request := TAaaRequest.FromJSON(Json); // Casted as TObject if Request <> nil then begin Result := RequestHandler.Handle(TAaaRequest(Request)); Request.Free; end; end else if (Method = TBbbRequest.ClassName) then begin Request := TBbbRequest.FromJSON(Json); // Casted as TObject if Request <> nil then begin Result := RequestHandler.Handle(TBbbRequest(Request)); Request.Free; end; end else Result := CreateErrorResponse('Unknown method: ' + Json.ToString); end; According to the code, the handling of different request types are very similar. If I have 100 different request types, I have to copy and paste the above code block 100 times. This is not clever. I am looking for a better way to do the same logic. My imagination is as follows: TDecoder = class private FRequestTypes: TDictionary<string, TClassInfo>; // Does this work? public constructor Create; destructor Destroy; override; function Decode(const Json: TJsonObject; const RequestHandler: IRequestHandler): TResponse; end; constructor TDecoder.Create; begin FRequestTypes := TDictionary<string, TClassInfo>.Create; FRequestTypes.Add(TAaaRequest.ClassName, TAaaRequest); // Does this work? FRequestTypes.Add(TBbbRequest.ClassName, TBbbRequest); end; destructor TDecoder.Destroy; begin FRequestTypes.Free; inherited; end; function TDecoder.Decode(const Json: TJsonObject; const RequestHandler: IRequestHandler): TResponse; var Method: string; Info: TClassInfo; Request: TObject; begin Method := Json['method'].AsString; if FRequestTypes.ContainsKey(Method) then begin // An universal way Info := FRequestTypes[Method]; Request := Info.FromJSON(Json); // Casted as TObject if Request <> nil then begin Result := RequestHandler.Handle(Info(Request)); // Casted to corresponding class type (e.g. TAaaRequest or TBbbRequest) Request.Free; end; end else Result := CreateErrorResponse('Unknown method: ' + Json.ToString); end; I do not know, if I can write an universal way to handle a great number of different request types. Development environment Delphi 2010. Any hint is appreciated.

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• Javascript Closures - What are the negatives?

  - by vol7ron

  Question: There seem to be many benefits to Closures, but what are the negatives (memory leakage? obfuscation problems? bandwidth increasage?)? Additionally, is my understanding of Closures correct? Finally, once closures are created, can they be destroyed? I've been reading a little bit about Javascript Closures. I hope someone a little more knowledgeable will guide my assertions, correcting me where wrong. Benefits of Closures: Encapsulate the variables to a local scope, by using an internal function. The anonymity of the function is insignificant. What I've found helpful is to do some basic testing, regarding local/global scope: <script type="text/javascript"> var global_text = ""; var global_count = 0; var global_num1 = 10; var global_num2 = 20; var global_num3 = 30; function outerFunc() { var local_count = local_count || 0; alert("global_num1: " + global_num1); // global_num1: undefined var global_num1 = global_num1 || 0; alert("global_num1: " + global_num1); // global_num1: 0 alert("global_num2: " + global_num2); // global_num2: 20 global_num2 = global_num2 || 0; // (notice) no definition with 'var' alert("global_num2: " + global_num2); // global_num2: 20 global_num2 = 0; alert("local_count: " + local_count); // local_count: 0 function output() { global_num3++; alert("local_count: " + local_count + "\n" + "global_count: " + global_count + "\n" + "global_text: " + global_text ); local_count++; } local_count++; global_count++; return output; } var myFunc = outerFunc(); myFunc(); /* Outputs: ********************** * local_count: 1 * global_count: 1 * global_text: **********************/ global_text = "global"; myFunc(); /* Outputs: ********************** * local_count: 2 * global_count: 1 * global_text: global **********************/ var local_count = 100; myFunc(); /* Outputs: ********************** * local_count: 3 * global_count: 1 * global_text: global **********************/ alert("global_num1: " + global_num1); // global_num1: 10 alert("global_num2: " + global_num2); // global_num2: 0 alert("global_num3: " + global_num3); // global_num3: 33 </script> Interesting things I took out of it: The alerts in outerFunc are only called once, which is when the outerFunc call is assigned to myFunc (myFunc = outerFunc()). This assignment seems to keep the outerFunc open, in what I would like to call a persistent state. Everytime myFunc is called, the return is executed. In this case, the return is the internal function. Something really interesting is the localization that occurs when defining local variables. Notice the difference in the first alert between global_num1 and global_num2, even before the variable is trying to be created, global_num1 is considered undefined because the 'var' was used to signify a local variable to that function. -- This has been talked about before, in the order of operation for the Javascript engine, it's just nice to see this put to work. Globals can still be used, but local variables will override them. Notice before the third myFunc call, a global variable called local_count is created, but it as no effect on the internal function, which has a variable that goes by the same name. Conversely, each function call has the ability to modify global variables, as noticed by global_var3. Post Thoughts: Even though the code is straightforward, it is cluttered by alerts for you guys, so you can plug and play. I know there are other examples of closures, many of which use anonymous functions in combination with looping structures, but I think this is good for a 101-starter course to see the effects. The one thing I'm concerned with is the negative impact closures will have on memory. Because it keeps the function environment open, it is also keeping those variables stored in memory, which may/may not have performance implications, especially regarding DOM traversals and garbage collection. I'm also not sure what kind of role this will play in terms of memory leakage and I'm not sure if the closure can be removed from memory by a simple "delete myFunc;." Hope this helps someone, vol7ron

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• How do I properly add existing source code files to my Xcode project?

  - by BeachRunnerJoe

  I'm new to iPhone development and I'm still getting familiar with the Mac dev environment, including Xcode. I want to add some 3rd party code to my iPhone project, but when I add the "existing files" to my Xcode project, I'm presented with a dialog box that has far too many options that I don't understand and, as such, my project isn't working. When I #import headerfilename.h, I get a build error that reads headerfilename.h: No such file or directory. Can anyone explain to me what all these options mean or give me a link to some documentation that can? I'm having a hard time finding anything in Apple's docs. Which options do I want to choose to add existing source code files to my Xcode project? I should note that the source code files that I'm trying to add are located in my project/Classes/frameworkname/ directory. After they're added, do I need to reference this new code directory in my project settings anywhere (i.e. some kind of header file directory variable)? Thanks so much! Update: I found the following answers/responses on the apple dev forums that were very useful and helped me fix my issue... To make it simple : - if you do not check the copy option, the file stay where it is. - if you check it, it is copied in your project folders In the first case (what it seems you are doing) you need to tell the compiler that the header files are in another directory : - project info - build - search paths - User Header Search Path : add the directory from where you took the header file Hope this will help You have discovered the most confusing dialog box that ever came out of Cupertino. Six years of Xcode, and this thing still is partly a mystery to me. To even get that far, I had to make many test projects to try and reverse-engineer what this thing does. The "Copy" box means that it will copy the files as they are right now, into the project. If this box is not checked, then it just references those files during a build and copies them as they are at THAT time. For source code, you want the Copy box checked. The "relative to" is a total mystery to me and I can't help you with that. I usually leave it however it is already set. Does it mean relative to where they are on disk, or the arrangement in Xcode, or in the bundle? Who knows. The last 2 radio buttons SEEM to mean that it will either re-create the folder structure of the folder you are adding, or just put "fake" folders in Xcode that point to the real folders. This is probably your problem - you are adding source code that is not all at the top level, and when it goes to find it, it does not re-create the hierarchy. Others can supply a better way, hopefully, but what I would do is put all of the source in one folder and add that, using the Copy box. Then in Xcode you can make whatever bogus folders you want and put the source file names in those fake folders.

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• Is this a right way to use NHibernate?

  - by Venemo

  I spent the rest of the evening reading StackOverflow questions and also some blog entries and links about the subject. All of them turned out to be very helpful, but I still feel that they don't really answer my question. So, I'm developing a simple web application. I'd like to create a reusable data access layer which I can later reuse in other solutions. 99% of these will be web applications. This seems to be a good excuse for me to learn NHibernate and some of the patterns around it. My goals are the following: I don't want the business logic layer to know ANYTHING about the inner workings of the database, nor NHibernate itself. I want the business logic layer to have the least possible number of assumptions about the data access layer. I want the data access layer as simplistic and easy-to-use as possible. This is going to be a simple project, so I don't want to overcomplicate anything. I want the data access layer to be as non-intrusive as possible. Will all this in mind, I decided to use the popular repository pattern. I read about this subject on this site and on various dev blogs, and I heard some stuff about the unit of work pattern. I also looked around and checked out various implementations. (Including FubuMVC contrib, and SharpArchitecture, and stuff on some blogs.) I found out that most of these operate with the same principle: They create a "unit of work" which is instantiated when a repository is instantiated, they start a transaction, do stuff, and commit, and then start all over again. So, only one ISession per Repository and that's it. Then the client code needs to instantiate a repository, do stuff with it, and then dispose. This usage pattern doesn't meet my need of being as simplistic as possible, so I began thinking about something else. I found out that NHibernate already has something which makes custom "unit of work" implementations unnecessary, and that is the CurrentSessionContext class. If I configure the session context correctly, and do the clean up when necessary, I'm good to go. So, I came up with this: I have a static class called NHibernateHelper. Firstly, it has a static property called CurrentSessionFactory, which upon first call, instantiates a session factory and stores it in a static field. (One ISessionFactory per one AppDomain is good enough.) Then, more importantly, it has a CurrentSession static property, which checks if there is an ISession bound to the current session context, and if not, creates one, and binds it, and it returns with the ISession bound to the current session context. Because it will be used mostly with WebSessionContext (so, one ISession per HttpRequest, although for the unit tests, I configured ThreadStaticSessionContext), it should work seamlessly. And after creating and binding an ISession, it hooks an event handler to the HttpContext.Current.ApplicationInstance.EndRequest event, which takes care of cleaning up the ISession after the request ends. (Of course, it only does this if it is really running in a web environment.) So, with all this set up, the NHibernateHelper will always be able to return a valid ISession, so there is no need to instantiate a Repository instance for the "unit of work" to operate properly. Instead, the Repository is a static class which operates with the ISession from the NHibernateHelper.CurrentSession property, and exposes some functionality through that. I'm curious, what do you think about this? Is it a valid way of thinking, or am I completely off track here?

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• Ruby on Rails is complaining about a method that doesn't exist that is built into Active Record. Wha

  - by grg-n-sox

  This will probably just be a simple problem and I am just blind or an idiot but I could use some help. So I am going over some basic guides in Rails, reviewing the basics and such for an upcoming exam. One of the guides included was the sort-of-standard getting started guide over at guide.rubyonrails.org. Here is the link if you need it. Also all my code is for my app is from there, so I have no problem releasing any of my code since it should be the same as shown there. I didn't do a copy paste, but I basically was typing with Vim in one half of my screen and the web page in the other half, typing what I see. http://guides.rubyonrails.org/getting_started.html So like I said, I am going along the guide when I noticed past a certain point in the tutorial, I was always getting an error on the site. To find the section of code, just hit Ctrl+f on the page (or whatever you have search/find set to) and enter "accepts_". This should immediately direct you to this chunk of code. class Post < ActiveRecord::Base validates_presence_of :name, :title validates_length_of :title, :minimum => 5 has_many :comments has_many :tags accepts_nested_attributes_for :tags, :allow_destroy => :true , :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } } end So I tried putting this in my code. It is in ~/Rails/blog/app/models/post.rb in case you are wondering. However, even after all the other code I put in past that in the guide, hoping I was just missing some line of code that would come up later in the guide. But nothing, same error every time. This is what I get. NoMethodError in PostsController#index undefined method `accepts_nested_attributes_for' for #<Class:0xb7109f98> /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1833:in `method_missing' app/models/post.rb:7 app/controllers/posts_controller.rb:9:in `index' Request Parameters: None Response Headers: {"Content-Type"=>"", "cookie"=>[], "Cache-Control"=>"no-cache"} Now, I copied the above code from the guide. The two code sections I edited mentioned in the error message I will paste as is below. class PostsController < ApplicationController # GET /posts # GET /posts.xml before_filter :find_post, :only => [:show, :edit, :update, :destroy] def index @posts = Post.find(:all) # <= the line 9 referred to in error message respond_to do |format| format.html # index.html.erb format.xml { render :xml => @posts } end end class Post < ActiveRecord::Base validates_presence_of :name, :title validates_length_of :title, :minimum => 5 has_many :comments has_many :tags accepts_nested_attributes_for :tags, :allow_destroy => :true , # <= problem :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } } end Also here is gem local gem list. I do note that they are a bit out of date, but the default Rails install any of the school machines (an environment likely for my exam) is basically 'gem install rails --version 2.2.2' and since they are windows machines, they come with all the normal windows ruby gems that comes with the ruby installer. However, I am running this off a Debian virtual machine of mine, but trying to set it up similarly and I figured the windows ruby gems wouldn't change anything in Rails. *** LOCAL GEMS *** actionmailer (2.2.2) actionpack (2.2.2) activerecord (2.2.2) activeresource (2.2.2) activesupport (2.2.2) gem_plugin (0.2.3) hpricot (0.8.2) linecache (0.43) log4r (1.1.7) ptools (1.1.9) rack (1.1.0) rails (2.2.2) rake (0.8.7) sqlite3-ruby (1.2.3) So any ideas on what the problem is? Thanks in advanced.

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• Error when opening .tar.gz via Shell to install Apache Maven

  - by adamsquared

  Thank you in advance for the help. My Goal: To install apache maven per its websites instructions (http://maven.apache.org/download.html), in order to install the JUNG package according to its install instructions (http://sourceforge.net/apps/trac/jung/wiki/JUNGManual), so I can use the JUNG classes in various Java GUIs. The Problem: I get an error message when I try to extract the apache-maven .gz (install?) file in shell. Background: I'm trying to install the JUNG (http://jung.sourceforge.net/index.html) package to my system's Java, so I can write object-oriented code using various GUIs (Ecliplse, Dr. Java) using the classes in JUNG. I don't understand how the building/installing process works, and how I can get what I build/install to work on various GUIs and the command line. I'm new to shell and the command line, and mostly have experience using a simple IDE (DrJava, Python IDLE, R GUI) to write and compile object-oriented code. Machine: Mac OSX 10.5.8 32-bit. The Instructions: For the maven building Extract the distribution archive, i.e. apache-maven-3.0.4-bin.tar.gz to the directory you wish to install Maven 3.0.4. These instructions assume you chose /usr/local/apache-maven. The subdirectory apache-maven-3.0.4 will be created from the archive. ... for the JUNG installation Appendix: How to Build JUNG This is a brief intro to building JUNG jars with maven2 (the build system that JUNG currently uses). First, ensure that you have a JDK of at least version 1.5: JUNG 2.0+ requires Java 1.5+. Ensure that your JAVA_HOME variable is set to the location of the JDK. On a Windows platform, you may have a separate JRE (Java Runtime Environment) and JDK (Java Development Kit). The JRE has no capability to compile Java source files, so you must have a JDK installed. If your JAVA_HOME variable is set to the location of the JRE, and not the location of the JDK, you will be unable to compile. Get Maven Download and install maven2 from maven.apache.org: http://maven.apache.org/download.html At time of writing (early December 2009), the latest version was maven-2.2.1. Install the downloaded maven2 (there are installation instructions on the Maven website). Follow the installation instructions and confirm a successful installation by typing 'mvn --version' in a command terminal window. Get JUNG ... What I Did: I downloaded the file apache-maven-2.2.1-bin.tar.gz. The JUNG website specified to use apache maven 2. I wanted to stick to the recommended installation instructions, but I couldn't get to /usr on my GUI (i've noticed you click on the MacHD symbol on the desktop its missing several directories/folders that you can see using the shell using the ls command at root directory I couldn't find a way to access the file using my mac GUI. Therefore, I used the shell to navigate to the root directory and then to /usr/local, and used the mkdir command to make the directory apache-maven and entered it. I then moved the file using the mv command. Next I tried extracting the file using tar -zxvf apache-maven-2.2.1-bin.tar.gz. The Error Message: tar: apache-maven-2.2.1/direcoryandfile: Cannot open: No such file or directory ... apache-maven-2.2.1/lib/ext: Cannot mkdir: No such file or directory apache-maven-2.2.1/lib/ext/README.txt tar: apache-maven-2.2.1/lib/ext/README.txt: Cannot open: No such file or directory tar: Error exit delayed from previous errors From what I can tell the archive file is missing some directories or something. I tried deleting the file, redownloading the .tar.gz file from a different mirror and repeating the process. Same result. Thanks again for the help

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• Is it a missing implementation with JPA implementation of hibernate??

  - by Jegan

  Hi all, On my way in understanding the transaction-type attribute of persistence.xml, i came across an issue / discrepency between hibernate-core and JPA-hibernate which looks weird. I am not pretty sure whether it is a missing implementation with JPA of hibernate. Let me post the comparison between the outcome of JPA implementation and the hibernate implementation of the same concept. Environment Eclipse 3.5.1 JSE v1.6.0_05 Hibernate v3.2.3 [for hibernate core] Hibernate-EntityManger v3.4.0 [for JPA] MySQL DB v5.0 Issue 1.Hibernate core package com.expt.hibernate.core; import java.io.Serializable; public final class Student implements Serializable { private int studId; private String studName; private String studEmailId; public Student(final String studName, final String studEmailId) { this.studName = studName; this.studEmailId = studEmailId; } public int getStudId() { return this.studId; } public String getStudName() { return this.studName; } public String getStudEmailId() { return this.studEmailId; } private void setStudId(int studId) { this.studId = studId; } private void setStudName(String studName) { this.studName = stuName; } private void setStudEmailId(int studEmailId) { this.studEmailId = studEmailId; } } 2. JPA implementaion of Hibernate package com.expt.hibernate.jpa; import java.io.Serializable; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name = "Student_Info") public final class Student implements Serializable { @Id @GeneratedValue @Column(name = "STUD_ID", length = 5) private int studId; @Column(name = "STUD_NAME", nullable = false, length = 25) private String studName; @Column(name = "STUD_EMAIL", nullable = true, length = 30) private String studEmailId; public Student(final String studName, final String studEmailId) { this.studName = studName; this.studEmailId = studEmailId; } public int getStudId() { return this.studId; } public String getStudName() { return this.studName; } public String getStudEmailId() { return this.studEmailId; } } Also, I have provided the DB configuration properties in the associated hibernate-cfg.xml [in case of hibernate core] and persistence.xml [in case of JPA (hibernate entity manager)]. create a driver and perform add a student and query for the list of students and print their details. Then the issue comes when you run the driver program. Hibernate core - output Exception in thread "main" org.hibernate.InstantiationException: No default constructor for entity: com.expt.hibernate.core.Student at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:84) at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:100) at org.hibernate.tuple.entity.AbstractEntityTuplizer.instantiate(AbstractEntityTuplizer.java:351) at org.hibernate.persister.entity.AbstractEntityPersister.instantiate(AbstractEntityPersister.java:3604) .... .... This exception is flashed when the driver is executed for the first time itself. JPA Hibernate - output First execution of the driver on a fresh DB provided the following output. DEBUG SQL:111 - insert into student.Student_Info (STUD_EMAIL, STUD_NAME) values (?, ?) 17:38:24,229 DEBUG SQL:111 - select student0_.STUD_ID as STUD1_0_, student0_.STUD_EMAIL as STUD2_0_, student0_.STUD_NAME as STUD3_0_ from student.Student_Info student0_ student list size == 1 1 || Jegan || [email protected] second execution of the driver provided the following output. DEBUG SQL:111 - insert into student.Student_Info (STUD_EMAIL, STUD_NAME) values (?, ?) 17:40:25,254 DEBUG SQL:111 - select student0_.STUD_ID as STUD1_0_, student0_.STUD_EMAIL as STUD2_0_, student0_.STUD_NAME as STUD3_0_ from student.Student_Info student0_ Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.InstantiationException: No default constructor for entity: com.expt.hibernate.jpa.Student at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614) at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:76) at driver.StudentDriver.main(StudentDriver.java:43) Caused by: org.hibernate.InstantiationException: No default constructor for entity: com.expt.hibernate.jpa.Student .... .... Could anyone please let me know if you have encountered this sort of inconsistency? Also, could anyone please let me know if the issue is a missing implementation with JPA-Hibernate? ~ Jegan

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• How might maven's buildNumber metadata become inconsistent across multiple build agents?

  - by Brian Laframboise

  We recently added a second build machine to our build environment and began experiencing very odd occasional build failures. I have two separate Maven build machines, A and B, each running Maven 2.2.1 and communicating to a shared Nexus 1.5.0 repository manager. My problem is that builds on B will occasionally fail because it refuses to download a newer version of a common dependency 'acme-1.0.0-SNAPSHOT' previously built by A and uploaded to Nexus. Looking inside the local repositories on both machines I noticed some oddities in the repository metadata. Machine A's acme\1.0.0-SNAPSHOT\maven-metadata-nexus.xml: <metadata> <groupId>acme</groupId> <artifactId>acme</artifactId> <version>1.0.0-SNAPSHOT</version> <versioning> <snapshot> <buildNumber>1</buildNumber> </snapshot> <lastUpdated>20100525173546</lastUpdated> </versioning> </metadata> Machine B's acme\1.0.0-SNAPSHOT\maven-metadata-nexus.xml: <metadata> <groupId>acme</groupId> <artifactId>acme</artifactId> <version>1.0.0-SNAPSHOT</version> <versioning> <snapshot> <buildNumber>2</buildNumber> </snapshot> <lastUpdated>20100519232317</lastUpdated> </versioning> </metadata> In Nexus's acme/1.0.0-SNAPSHOT/maven-metadata.xml: <metadata> <groupId>acme</groupId> <artifactId>acme</artifactId> <version>1.0.0-SNAPSHOT</version> <versioning /> </metadata> If I'm interpreting the metadata files correctly (documentation online is scant), it appears machine B believes it has a newer version of the acme dependency (based on buildNumber) despite the fact that machine A last built it 6 days after machine B did (based on timestamp). Nexus also appears to be unaware of a universally correct buildNumber. How could this situation possibly arise? What could I do to prevent my builds from failing due to inconsistent metadata? Have you experienced anything similar? Important notes: Both build machines have settings.xml files where the updatePolicy is "always". Nexus does indeed have the newer version of acme that was built by A. B simply refuses to download it. A and B are the only machines uploading to Nexus. Both servers share the same system time. All processes involved have write privileges to the metadata files so that they can be updated as necessary. I was unable to find any open Maven or Nexus issues describing this behaviour. Our CI server (Atlassian Bamboo) prevents builds of the same artifact from happening concurrently, so some race condition while uploading to Nexus is rather unlikely.

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• NetBeans 7.2 MinGW installing for OpenCV

  - by Gligorijevic

  i have installed minGW on my PC according to http://netbeans.org/community/releases/72/cpp-setup-instructions.html, and i have "restored defaults" using NetBeans 7.2 who has found all necessary files. But when I made test sample C++ app i got following error: c:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../../mingw32/bin/ld.exe: cannot find -ladvapi32 c:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../../mingw32/bin/ld.exe: cannot find -lshell32 c:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../../mingw32/bin/ld.exe: cannot find -luser32 c:/mingw/bin/../lib/gcc/mingw32/4.6.2/../../../../mingw32/bin/ld.exe: cannot find -lkernel32 collect2: ld returned 1 exit status make[2]: *** [dist/Debug/MinGW-Windows/welcome_1.exe] Error 1 make[1]: *** [.build-conf] Error 2 make: *** [.build-impl] Error 2 Can anyone give me a hand with installing openCV and minGW for NetBeans? generated Makefiles file goes like this: > # CMAKE generated file: DO NOT EDIT! > # Generated by "MinGW Makefiles" Generator, CMake Version 2.8 > > # Default target executed when no arguments are given to make. default_target: all .PHONY : default_target > > #============================================================================= > # Special targets provided by cmake. > > # Disable implicit rules so canonical targets will work. .SUFFIXES: > > # Remove some rules from gmake that .SUFFIXES does not remove. SUFFIXES = > > .SUFFIXES: .hpux_make_needs_suffix_list > > # Suppress display of executed commands. $(VERBOSE).SILENT: > > # A target that is always out of date. cmake_force: .PHONY : cmake_force > > #============================================================================= > # Set environment variables for the build. > > SHELL = cmd.exe > > # The CMake executable. CMAKE_COMMAND = "C:\Program Files (x86)\cmake-2.8.9-win32-x86\bin\cmake.exe" > > # The command to remove a file. RM = "C:\Program Files (x86)\cmake-2.8.9-win32-x86\bin\cmake.exe" -E remove -f > > # Escaping for special characters. EQUALS = = > > # The program to use to edit the cache. CMAKE_EDIT_COMMAND = "C:\Program Files (x86)\cmake-2.8.9-win32-x86\bin\cmake-gui.exe" > > # The top-level source directory on which CMake was run. CMAKE_SOURCE_DIR = C:\msys\1.0\src\opencv > > # The top-level build directory on which CMake was run. CMAKE_BINARY_DIR = C:\msys\1.0\src\opencv\build\mingw > > #============================================================================= > # Targets provided globally by CMake. > > # Special rule for the target edit_cache edit_cache: @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --cyan > "Running CMake cache editor..." "C:\Program Files > (x86)\cmake-2.8.9-win32-x86\bin\cmake-gui.exe" -H$(CMAKE_SOURCE_DIR) > -B$(CMAKE_BINARY_DIR) .PHONY : edit_cache > > # Special rule for the target edit_cache edit_cache/fast: edit_cache .PHONY : edit_cache/fast

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• Why might a System.String object not cache its hash code?

  - by Dan Tao

  A glance at the source code for string.GetHashCode using Reflector reveals the following (for mscorlib.dll version 4.0): public override unsafe int GetHashCode() { fixed (char* str = ((char*) this)) { char* chPtr = str; int num = 0x15051505; int num2 = num; int* numPtr = (int*) chPtr; for (int i = this.Length; i > 0; i -= 4) { num = (((num << 5) + num) + (num >> 0x1b)) ^ numPtr[0]; if (i <= 2) { break; } num2 = (((num2 << 5) + num2) + (num2 >> 0x1b)) ^ numPtr[1]; numPtr += 2; } return (num + (num2 * 0x5d588b65)); } } Now, I realize that the implementation of GetHashCode is not specified and is implementation-dependent, so the question "is GetHashCode implemented in the form of X or Y?" is not really answerable. I'm just curious about a few things: If Reflector has disassembled the DLL correctly and this is the implementation of GetHashCode (in my environment), am I correct in interpreting this code to indicate that a string object, based on this particular implementation, would not cache its hash code? Assuming the answer is yes, why would this be? It seems to me that the memory cost would be minimal (one more 32-bit integer, a drop in the pond compared to the size of the string itself) whereas the savings would be significant, especially in cases where, e.g., strings are used as keys in a hashtable-based collection like a Dictionary<string, [...]>. And since the string class is immutable, it isn't like the value returned by GetHashCode will ever even change. What could I be missing? UPDATE: In response to Andras Zoltan's closing remark: There's also the point made in Tim's answer(+1 there). If he's right, and I think he is, then there's no guarantee that a string is actually immutable after construction, therefore to cache the result would be wrong. Whoa, whoa there! This is an interesting point to make (and yes it's very true), but I really doubt that this was taken into consideration in the implementation of GetHashCode. The statement "therefore to cache the result would be wrong" implies to me that the framework's attitude regarding strings is "Well, they're supposed to be immutable, but really if developers want to get sneaky they're mutable so we'll treat them as such." This is definitely not how the framework views strings. It fully relies on their immutability in so many ways (interning of string literals, assignment of all zero-length strings to string.Empty, etc.) that, basically, if you mutate a string, you're writing code whose behavior is entirely undefined and unpredictable. I guess my point is that for the author(s) of this implementation to worry, "What if this string instance is modified between calls, even though the class as it is publicly exposed is immutable?" would be like for someone planning a casual outdoor BBQ to think to him-/herself, "What if someone brings an atomic bomb to the party?" Look, if someone brings an atom bomb, party's over.

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• Spring MVC working with Web Designers

  - by jboyd

  When working with web-designers in a Spring-MVC and JSP environment, are there any tools or helpful patterns to reduce the pain of going back and forth from HTML to JSP and back? Project requirements dictate that views will change often, and it can be difficult to make changes efficiently because of the amount of Java code that leaks into the view layer. Ideally I'd like to remove almost all Java code from the view, but it does not seem like this works with the Spring/JSP philosophy where often the way to remove Java code is to replace that code with tag libraries, which will still have a similar problem. To provide a little clarity to my question I'm going to include some existing code (inherited by me) to show the kinds of problems I'm likely to face when change the look of our views: <%-- Begin looping through results --%> <% List memberList = memberSearchResults.getResults(); for(int i = start - 1; i < memberList.size() && i < end; i++) { Profile profile = (Profile)memberList.get(i); long profileId = profile.getProfileId(); String nickname = profile.getNickname(); String description = profile.getDescription(); Image image = profile.getAvatarImage(); String avatarImageSrc = null; int avatarImageWidthNum = 0; int avatarImageHeightNum = 0; if(null != image) { avatarImageSrc = image.getSrc(); avatarImageWidthNum = image.getWidth(); avatarImageHeightNum = image.getHeight(); } String bgColor = i % 2 == 1 ? "background-color:#FFF" : ""; %> <div style="float:left;clear:both;padding:5px 0 5px 5px;cursor:pointer;<%= bgColor %>" onclick='window.location="profile.sp?profileId=<%= profileId %>"'> <div style="float:right;clear:right;padding-left:10px;width:515px;font-size:10px;color:#7e7e7e"> <h6><%= nickname %></h6> <%= description %> </div> <img style="float:left;clear:left;" alt="Avatar Image" src="<%= null != avatarImageSrc && avatarImageSrc.trim().length() > 0 ? avatarImageSrc : "images/defaultUserImage.png" %>" <%= avatarImageWidthNum < avatarImageHeightNum ? "height='59'" : "width='92'" %> /> </div> <% } // End loop %> Now, ignoring some of the code smells there, it's obvious that if someone wants to change the look of that DIV it would be neccesary to re-place all the Java/JSP code into the new HTML given (the designers don't work in JSP files, they have their own HTML versions of the website). Which is tedious, and prone to errors.

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• Opinions on Dual-Salt authentication for low sensitivity user accounts?

  - by Heleon

  EDIT - Might be useful for someone in the future... Looking around the bcrypt class in php a little more, I think I understand what's going on, and why bcrypt is secure. In essence, I create a random blowfish salt, which contains the number of crypt rounds to perform during the encryption step, which is then hashed using the crypt() function in php. There is no need for me to store the salt I used in the database, because it's not directly needed to decrypt, and the only way to gain a password match to an email address (without knowing the salt values or number of rounds) would be to brute force plain text passwords against the hash stored in the database using the crypt() function to verify, which, if you've got a strong password, would just be more effort than it's worth for the user information i'm storing... I am currently working on a web project requiring user accounts. The application is CodeIgniter on the server side, so I am using Ion Auth as the authentication library. I have written an authentication system before, where I used 2 salts to secure the passwords. One was a server-wide salt which sat as an environment variable in the .htaccess file, and the other was a randomly generated salt which was created at user signup. This was the method I used in that authentication system for hashing the password: $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; //create a random string to be used as the random salt for the password hash $size = strlen($chars); for($i = 0; $i < 22; $i++) { $str .= $chars[rand(0, $size - 1)]; } //create the random salt to be used for the crypt $r_blowfish_salt = "$2a$12$" . $str . "$"; //grab the website salt $salt = getenv('WEBSITE_SALT'); //combine the website salt, and the password $password_to_hash = $pwd . $salt; //crypt the password string using blowfish $password = crypt($password_to_hash, $r_blowfish_salt); I have no idea whether this has holes in it or not, but regardless, I moved over to Ion Auth for a more complete set of functions to use with CI. I noticed that Ion only uses a single salt as part of its hashing mechanism (although does recommend that encryption_key is set in order to secure the database session.) The information that will be stored in my database is things like name, email address, location by country, some notes (which will be recommended that they do not contain sensitive information), and a link to a Facebook, Twitter or Flickr account. Based on this, i'm not convinced it's necessary for me to have an SSL connection on the secure pages of my site. My question is, is there a particular reason why only 1 salt is being used as part as the Ion Auth library? Is it implied that I write my own additional salting in front of the functionality it provides, or am I missing something? Furthermore, is it even worth using 2 salts, or once an attacker has the random salt and the hashed password, are all bets off anyway? (I assume not, but worth checking if i'm worrying about nothing...)

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• RackSpace Cloud Strips $_SESSION if URL Has Certain File Extensions

  - by macinjosh

  The Situation I am creating a video training site for a client on the RackSpace Cloud using the traditional LAMP stack (RackSpace's cloud has both Windows and LAMP stacks). The videos and other media files I'm serving on this site need to be protected as my client charges money for access to them. There is no DRM or funny business like that, essentially we store the files outside of the web root and use PHP to authenticate user's before they are able to access the files by using mod_rewrite to run the request through PHP. So let's say the user requests a file at this URL: http://www.example.com/uploads/preview_image/29.jpg I am using mod_rewrite to rewrite that url to: http://www.example.com/files.php?path=%2Fuploads%2Fpreview_image%2F29.jpg Here is a simplified version of the files.php script: <?php // Setups the environment and sets $logged_in // This part requires $_SESSION require_once('../../includes/user_config.php'); if (!$logged_in) { // Redirect non-authenticated users header('Location: login.php'); } // This user is authenticated, continue $content_type = "image/jpeg"; // getAbsolutePathForRequestedResource() takes // a Query Parameter called path and uses DB // lookups and some string manipulation to get // an absolute path. This part doesn't have // any bearing on the problem at hand $file_path = getAbsolutePathForRequestedResource($_GET['path']); // At this point $file_path looks something like // this: "/path/to/a/place/outside/the/webroot" if (file_exists($file_path) && !is_dir($file_path)) { header("Content-Type: $content_type"); header('Content-Length: ' . filesize($file_path)); echo file_get_contents($file_path); } else { header('HTTP/1.0 404 Not Found'); header('Status: 404 Not Found'); echo '404 Not Found'; } exit(); ?> The Problem Let me start by saying this works perfectly for me. On local test machines it works like a charm. However once deployed to the cloud it stops working. After some debugging it turns out that if a request to the cloud has certain file extensions like .JPG, .PNG, or .SWF (i.e. extensions of typically static media files.) the request is routed to a cache system called Varnish. The end result of this routing is that by the time this whole process makes it to my PHP script the session is not present. If I change the extension in the URL to .PHP or if I even add a query parameter Varnish is bypassed and the PHP script can get the session. No problem right? I'll just add a meaningless query parameter to my requests! Here is the rub: The media files I am serving through this system are being requested through compiled SWF files that I have zero control over. They are generated by third-party software and I have no hope of adding or changing the URLs that they request. Are there any other options I have on this? Update: I should note that I have verified this behavior with RackSpace support and they have said there is nothing they can do about it.

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• Rails unknown action suddenly everywhere

  - by Joe

  The weird thing is that my app was working perfectly on Sat, and when I check it out on Monday (after doing nothing to it) I kept getting this problem: This behaviour is only happening on my production server. When I try to login or create a new user or do something that interacts with a form I am getting an unknown action error. A simple retrieval of rows does not throw this error however. I don't have all CRUD operations in most of my controllers because it's not necessary - but Rails always looks for the one that doesn't exist - it seams so anyway. If I make a mistake in the form that would normally throw a validation message to the user it will throw this error too, does that mean it has something to do with the model too (I'm not too Rails experienced and didn't know if that would be the case or not)? This is a general error I am getting - I have super_exception_notifier gem installed, so that's what all the extra params are. Processing SessionsController#new (for OMITTED at 2010-04-12 09:11:12) [GET] Rendering template within layouts/application Rendering sessions/new Completed in 3ms (View: 2, DB: 0) | 200 OK [http://OMITTED.com/session/new] Processing SessionsController#show (for OMITTED at 2010-04-12 09:11:14) [GET] ActionController::UnknownAction (No action responded to show. Actions: create, destroy, error_class_status_codes, error_class_status_codes=, error_layout, error_layout=, exception_notifiable_notification_level, exception_notifiable_notification_level=, exception_notifiable_silent_exceptions, exception_notifiable_silent_exceptions=, exception_notifiable_verbose, exception_notifiable_verbose=, http_status_codes, http_status_codes=, and new): dragonfly (0.5.3) lib/dragonfly/middleware.rb:13:in `call' passenger (2.2.9) lib/phusion_passenger/rack/request_handler.rb:92:in `process_request' passenger (2.2.9) lib/phusion_passenger/abstract_request_handler.rb:207:in `main_loop' passenger (2.2.9) lib/phusion_passenger/railz/application_spawner.rb:400:in `start_request_handler' passenger (2.2.9) lib/phusion_passenger/railz/application_spawner.rb:351:in `handle_spawn_application' passenger (2.2.9) lib/phusion_passenger/utils.rb:184:in `safe_fork' passenger (2.2.9) lib/phusion_passenger/railz/application_spawner.rb:349:in `handle_spawn_application' passenger (2.2.9) lib/phusion_passenger/abstract_server.rb:352:in `__send__' passenger (2.2.9) lib/phusion_passenger/abstract_server.rb:352:in `main_loop' passenger (2.2.9) lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously' passenger (2.2.9) lib/phusion_passenger/abstract_server.rb:163:in `start' passenger (2.2.9) lib/phusion_passenger/railz/application_spawner.rb:209:in `start' passenger (2.2.9) lib/phusion_passenger/spawn_manager.rb:262:in `spawn_rails_application' passenger (2.2.9) lib/phusion_passenger/abstract_server_collection.rb:126:in `lookup_or_add' passenger (2.2.9) lib/phusion_passenger/spawn_manager.rb:256:in `spawn_rails_application' passenger (2.2.9) lib/phusion_passenger/abstract_server_collection.rb:80:in `synchronize' passenger (2.2.9) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize' passenger (2.2.9) lib/phusion_passenger/spawn_manager.rb:255:in `spawn_rails_application' passenger (2.2.9) lib/phusion_passenger/spawn_manager.rb:154:in `spawn_application' passenger (2.2.9) lib/phusion_passenger/spawn_manager.rb:287:in `handle_spawn_application' passenger (2.2.9) lib/phusion_passenger/abstract_server.rb:352:in `__send__' passenger (2.2.9) lib/phusion_passenger/abstract_server.rb:352:in `main_loop' passenger (2.2.9) lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously' This is what one of my forms looks like (nothing special) <% form_tag session_path do -%> <p><%= label_tag 'Username' %><br /> <%= text_field_tag 'login', @login %></p> <p><%= label_tag 'password' %><br/> <%= password_field_tag 'password', nil %></p> <p><%= label_tag 'remember_me', 'Remember me' %> <%= check_box_tag 'remember_me', '1', @remember_me %></p> <p><%= submit_tag 'Log in' %></p> <% end -%> It looks like dragonfly is the culprit doesn't it, here's the section from the gem files it says is being naughty: module Dragonfly class Middleware def initialize(app, dragonfly_app_name) @app = app @dragonfly_app_name = dragonfly_app_name end def call(env) response = endpoint.call(env) if response[0] == 404 13 -->> @app.call(env) else response end end I don't know what goes on behind the scenes here so I probably haven't been looking in the right place to fix this issue. Like I said it only throws this in a production environment, which guess is what the 'env' variable is referencing. Thank you for your time! I've spent nearly my whole day trying to figure this out! :(

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• Modern alternatives to Java

  - by Ralph

  I have been a Java developer for 14 years and have written an enterprise-level (~500 kloc) Swing application that uses most of the standard library APIs. Recently, I have become disappointed with the progress that the language has made to "modernize" itself, and am looking for an alternative for ongoing development. I have considered moving to the .NET platform, but I have issues with using something the only runs well in Windows (I know about Mono, but that is still far behind Microsoft). I also plan on buying a new Macbook Pro as soon as Apple releases their new rumored Arrandale-based machines and want to develop in an environment that will feel "at home" in Unix/Linux. I have considered using Python or Ruby, but the standard Java library is arguably the largest of any modern language. In JVM-based languages, I looked at Groovy, but am disappointed with its performance. Rumor has it that with the soon-to-be released JDK7, with its InvokeDynamic instruction, this will improve, but I don't know how much. Groovy is also not truly a functional language, although it provides closures and some of the "functional" features on collections. It does not embrace immutability. I have narrowed my search down to two JVM-based alternatives: Scala and Clojure. Each has its strengths and weaknesses. I am looking for opinions. I am not an expert at either of these languages; I have read 2 1/2 books on Scala and am currently reading Stu Halloway's book on Clojure. Scala is strongly statically typed. I know the dynamic language folks claim that static typing is a crutch for not doing unit testing, but it does provide a mechanism for compile-time location of a whole class of errors. Scala is more concise than Java, but not as much as Clojure. Scala's inter-operation with Java seems to be better than Clojure's, in that most Java operations are easier to do in Scala than in Clojure. For example, I can find no way in Clojure to create a non-static initialization block in a class derived from a Java superclass. For example, I like the Apache commons CLI library for command line argument parsing. In Java and Scala, I can create a new Options object and add Option items to it in an initialization block as follows (Java code): final Options options = new Options() { { addOption(new Option("?", "help", false, "Show this usage information"); // other options } }; I can't figure out how to the same thing in Clojure (except by using (doit...)), although that may reflect my lack of knowledge of the language. Clojure's collections are optimized for immutability. They rarely require copy-on-write semantics. I don't know if Scala's immutable collections are implemented using similar algorithms, but Rich Hickey (Clojure's inventor) goes out of his way to explain how that language's data structures are efficient. Clojure was designed from the beginning for concurrency (as was Scala) and with modern multi-core processors, concurrency takes on more importance, but I occasionally need to write simple non-concurrent utilities, and Scala code probably runs a little faster for these applications since it discourages, but does not prohibit, "simple" mutability. One could argue that one-off utilities do not have to be super-fast, but sometimes they do tasks that take hours or days to complete. I know that there is no right answer to this "question", but I thought I would open it up for discussion. Are there other JVM-based languages that can be used for enterprise level development?

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• MVC Persist Collection ViewModel (Update, Delete, Insert)

  - by Riccardo Bassilichi

  In order to create a more elegant solution I'm curios to know your suggestion about a solution to persist a collection. I've a collection stored on DB. This collection go to a webpage in a viewmodel. When the go back from the webpage to the controller I need to persist the modified collection to the same DB. The simple solution is to delete the stored collection and recreate all rows. I need a more elegant solution to mix the collections and delete not present record, update similar records ad insert new rows. this is my Models and ViewModels. public class CustomerModel { public virtual string Id { get; set; } public virtual string Name { get; set; } public virtual IList<PreferredAirportModel> PreferedAirports { get; set; } } public class AirportModel { public virtual string Id { get; set; } public virtual string AirportName { get; set; } } public class PreferredAirportModel { public virtual AirportModel Airport { get; set; } public virtual int CheckInMinutes { get; set; } } // ViewModels public class CustomerViewModel { [Required] public virtual string Id { get; set; } public virtual string Name { get; set; } public virtual IList<PreferredAirporViewtModel> PreferedAirports { get; set; } } public class PreferredAirporViewtModel { [Required] public virtual string AirportId { get; set; } [Required] public virtual int CheckInMinutes { get; set; } } And this is the controller with not elegant solution. public class CustomerController { public ActionResult Save(string id, CustomerViewModel viewModel) { var session = SessionFactory.CurrentSession; var customer = session.Query<CustomerModel>().SingleOrDefault(el => el.Id == id); customer.Name = viewModel.Name; // How cai I Merge collections handling delete, update and inserts ? var modifiedPreferedAirports = new List<PreferredAirportModel>(); var modifiedPreferedAirportsVm = new List<PreferredAirporViewtModel>(); // Update every common Airport foreach (var airport in viewModel.PreferedAirports) { foreach (var custPa in customer.PreferedAirports) { if (custPa.Airport.Id == airport.AirportId) { modifiedPreferedAirports.Add(custPa); modifiedPreferedAirportsVm.Add(airport); custPa.CheckInMinutes = airport.CheckInMinutes; } } } // Remove common airports from ViewModel modifiedPreferedAirportsVm.ForEach(el => viewModel.PreferedAirports.Remove(el)); // Remove deleted airports from model var toDelete = customer.PreferedAirports.Except(modifiedPreferedAirports); toDelete.ForEach(el => customer.PreferedAirports.Remove(el)); // Add new Airports var toAdd = viewModel.PreferedAirports.Select(el => new PreferredAirportModel { Airport = session.Query<AirportModel>(). SingleOrDefault(a => a.Id == el.AirportId), CheckInMinutes = el.CheckInMinutes }); toAdd.ForEach(el => customer.PreferedAirports.Add(el)); session.Save(customer); return View(); } } My environment is ASP.NET MVC 4, nHibernate, Automapper, SQL Server. Thank You!!

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• Neo4j increasing latency as SKIP increases on Cypher query + REST API

  - by voldomazta

  My setup: Java(TM) SE Runtime Environment (build 1.7.0_45-b18) Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode) Neo4j 2.0.0-M06 Enterprise First I made sure I warmed up the cache by executing the following: START n=node(*) RETURN COUNT(n); START r=relationship(*) RETURN count(r); The size of the table is 63,677 nodes and 7,169,995 relationships Now I have the following query: START u1=node:node_auto_index('uid:39') MATCH (u1:user)-[w:WANTS]->(c:card)<-[h:HAS]-(u2:user) WHERE u2.uid <> 39 WITH u2.uid AS uid, (CASE WHEN w.qty < h.qty THEN w.qty ELSE h.qty END) AS have RETURN uid, SUM(have) AS total ORDER BY total DESC SKIP 0 LIMIT 25 This UID has about 40k+ results that I want to be able to put a pagination to. The initial skip was around 773ms. I tried page 2 (skip 25) and the latency was around the same even up to page 500 it only rose up to 900ms so I didn't really bother. Now I tried some fast forward paging and jumped by thousands so I did 1000, then 2000, then 3000. I was hoping the ORDER BY arrangement will already have been cached by Neo4j and using SKIP will just move to that index in the result and wont have to iterate through each one again. But for each thousand skip I made the latency increased by alot. It's not just cache warming because for one I already warmed up the cache and two, I tried the same skip a couple of times for each skip and it yielded the same results: SKIP 0: 773ms SKIP 1000: 1369ms SKIP 2000: 2491ms SKIP 3000: 3899ms SKIP 4000: 5686ms SKIP 5000: 7424ms Now who the hell would want to view 5000 pages of results? 40k even?! :) Good point! I will probably put a cap on the maximum results a user can view but I was just curious about this phenomenon. Will somebody please explain why Neo4j seems to be re-iterating through stuff which appears to be already known to it? Here is my profiling for the 0 skip: ==> ColumnFilter(symKeys=["uid", " INTERNAL_AGGREGATE65c4d6a2-1930-4f32-8fd9-5e4399ce6f14"], returnItemNames=["uid", "total"], _rows=25, _db_hits=0) ==> Slice(skip="Literal(0)", _rows=25, _db_hits=0) ==> Top(orderBy=["SortItem(Cached( INTERNAL_AGGREGATE65c4d6a2-1930-4f32-8fd9-5e4399ce6f14 of type Any),false)"], limit="Add(Literal(0),Literal(25))", _rows=25, _db_hits=0) ==> EagerAggregation(keys=["uid"], aggregates=["( INTERNAL_AGGREGATE65c4d6a2-1930-4f32-8fd9-5e4399ce6f14,Sum(have))"], _rows=41659, _db_hits=0) ==> ColumnFilter(symKeys=["have", "u1", "uid", "c", "h", "w", "u2"], returnItemNames=["uid", "have"], _rows=146826, _db_hits=0) ==> Extract(symKeys=["u1", "c", "h", "w", "u2"], exprKeys=["uid", "have"], _rows=146826, _db_hits=587304) ==> Filter(pred="((NOT(Product(u2,uid(0),true) == Literal(39)) AND hasLabel(u1:user(0))) AND hasLabel(u2:user(0)))", _rows=146826, _db_hits=146826) ==> TraversalMatcher(trail="(u1)-[w:WANTS WHERE (hasLabel(NodeIdentifier():card(1)) AND hasLabel(NodeIdentifier():card(1))) AND true]->(c)<-[h:HAS WHERE (NOT(Product(NodeIdentifier(),uid(0),true) == Literal(39)) AND hasLabel(NodeIdentifier():user(0))) AND true]-(u2)", _rows=146826, _db_hits=293696) And for the 5000 skip: ==> ColumnFilter(symKeys=["uid", " INTERNAL_AGGREGATE99329ea5-03cd-4d53-a6bc-3ad554b47872"], returnItemNames=["uid", "total"], _rows=25, _db_hits=0) ==> Slice(skip="Literal(5000)", _rows=25, _db_hits=0) ==> Top(orderBy=["SortItem(Cached( INTERNAL_AGGREGATE99329ea5-03cd-4d53-a6bc-3ad554b47872 of type Any),false)"], limit="Add(Literal(5000),Literal(25))", _rows=5025, _db_hits=0) ==> EagerAggregation(keys=["uid"], aggregates=["( INTERNAL_AGGREGATE99329ea5-03cd-4d53-a6bc-3ad554b47872,Sum(have))"], _rows=41659, _db_hits=0) ==> ColumnFilter(symKeys=["have", "u1", "uid", "c", "h", "w", "u2"], returnItemNames=["uid", "have"], _rows=146826, _db_hits=0) ==> Extract(symKeys=["u1", "c", "h", "w", "u2"], exprKeys=["uid", "have"], _rows=146826, _db_hits=587304) ==> Filter(pred="((NOT(Product(u2,uid(0),true) == Literal(39)) AND hasLabel(u1:user(0))) AND hasLabel(u2:user(0)))", _rows=146826, _db_hits=146826) ==> TraversalMatcher(trail="(u1)-[w:WANTS WHERE (hasLabel(NodeIdentifier():card(1)) AND hasLabel(NodeIdentifier():card(1))) AND true]->(c)<-[h:HAS WHERE (NOT(Product(NodeIdentifier(),uid(0),true) == Literal(39)) AND hasLabel(NodeIdentifier():user(0))) AND true]-(u2)", _rows=146826, _db_hits=293696) The only difference is the LIMIT clause on the Top function. I hope we can make this work as intended, I really don't want to delve into doing an embedded Neo4j + my own Jetty REST API for the web app.

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• OutOfMemoryError during the pdf merge

  - by Vijay

  the below code merges the pdf files and returns the combined pdf data. while this code runs, i try to combine the 100 files with each file approximately around 500kb, i get outofmemory error in the line document.close();. this code runs in the web environment, is the memory available to webspehere server is the problem? i read in an article to use freeReader method, but i cannot get how to use it my scenario. protected ByteArrayOutputStream joinPDFs(List<InputStream> pdfStreams, boolean paginate) { Document document = new Document(); ByteArrayOutputStream mergedPdfStream = new ByteArrayOutputStream(); try { //List<InputStream> pdfs = pdfStreams; List<PdfReader> readers = new ArrayList<PdfReader>(); int totalPages = 0; //Iterator<InputStream> iteratorPDFs = pdfs.iterator(); Iterator<InputStream> iteratorPDFs = pdfStreams.iterator(); // Create Readers for the pdfs. while (iteratorPDFs.hasNext()) { InputStream pdf = iteratorPDFs.next(); if (pdf == null) continue; PdfReader pdfReader = new PdfReader(pdf); readers.add(pdfReader); totalPages += pdfReader.getNumberOfPages(); } //clear this pdfStreams = null; //WeakReference ref = new WeakReference(pdfs); //ref.clear(); // Create a writer for the outputstream PdfWriter writer = PdfWriter.getInstance(document, mergedPdfStream); writer.setFullCompression(); document.open(); BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED); PdfContentByte cb = writer.getDirectContent(); // Holds the PDF // data PdfImportedPage page; int currentPageNumber = 0; int pageOfCurrentReaderPDF = 0; Iterator<PdfReader> iteratorPDFReader = readers.iterator(); // Loop through the PDF files and add to the output. while (iteratorPDFReader.hasNext()) { PdfReader pdfReader = iteratorPDFReader.next(); // Create a new page in the target for each source page. while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) { pageOfCurrentReaderPDF++; document.setPageSize(pdfReader .getPageSizeWithRotation(pageOfCurrentReaderPDF)); document.newPage(); // pageOfCurrentReaderPDF++; currentPageNumber++; page = writer.getImportedPage(pdfReader, pageOfCurrentReaderPDF); cb.addTemplate(page, 0, 0); // Code for pagination. if (paginate) { cb.beginText(); cb.setFontAndSize(bf, 9); cb.showTextAligned(PdfContentByte.ALIGN_CENTER, "" + currentPageNumber + " of " + totalPages, 520, 5, 0); cb.endText(); } } pageOfCurrentReaderPDF = 0; System.out.println("now the size is: "+pdfReader.getFileLength()); } mergedPdfStream.flush(); document.close(); mergedPdfStream.close(); return mergedPdfStream; } catch (Exception e) { e.printStackTrace(); } finally { if (document.isOpen()) document.close(); try { if (mergedPdfStream != null) mergedPdfStream.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } return mergedPdfStream; } Thanks V

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