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• Error! How to install glassfish in ubuntu 9.04??

  - by artaxerxe

  I try to install GlassFish on my ubuntu, and gets the error: Could not locate a suitable jar utility. Please ensure that you have Java 6 or newer installed on your system and accessible in your PATH or by setting JAVA_HOME when I type: echo $PATH it prints out: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/opt/jdk1.6.0_20:/opt/jdk1.6.0_20/bin Can anybody explain me where is the problem and how to solve it? i have also read this topic, but it doesn't work. N.B. Before to reinstall Ubuntu it works fine. This problem comes after reinstallation.

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• Compile OpenSSL from source using Xilinx EDK

  - by Asanka

  I want to use openSSL functions in my xilinx C++ project. So i downloaded the source and tried to compile using the makefile. But unfortunately the linux box I was provided did not contained the required software (perl5, make, etc) to compile the source using makefile. So as the second option i tried to compile the source as a shared library. So i made a new project using existing openSSL source. But all the attempts were failed since it gave lots of errors including missing headers, unknown defines etc. If someone knows how to compile openssl as a shared library using Xilinx toolchains please help me. It would be really helpful if someone can provide the complete project which can be opened using Xilinx EDK. If better alternative exists to use openssl with xilinx toolchains please explain that also. Thanks in advance....

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• Dynamic find methods Vs conditional statements

  - by piemesons

  Student.find(:all, :conditions => [‘name = ? and status = ?’ ‘mohit’, 1]) Vs Student.find_all_by_name_and_status(‘mohit’, 1) Both the queries will result the same set of row but first one is preferable cause in the second way there will be exception generated method_missing and then rails will try to relate it as dynamic method. if fine then result set to returned. Can any body explain me this in a good manner. What exactly is happening behind the screen. Please correct me if i am wrong.

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• Google Chrome Speed Tracer what does Request Timing and Response Timing actually measure?

  - by Bryce Thomas

  I'm testing out the Google Chrome Speed Tracer on a few common web pages and taking a look through the results. One thing I'm not sure I understand is what the "Request Timing" and "Response Timing" properties of resources are actually measuring. Initially I thought Request Timing must measure the time from a request for a resource being sent and when that request arrived at the server. However, I then wondered how the Speed Tracer would actually have any way of measuring this. Furthermore, the Response Timing that I'm getting for resources tends to be far less than the Request Timing (e.g. 500ms request, 1ms response), which is a little bit suss. So is anyone able to explain exactly what Request Timing and Response Timing are measuring?

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• C# Conditional Operator Not a Statement?

  - by abelenky

  I have a simple little code fragment that is frustrating me: HashSet<long> groupUIDs = new HashSet<long>(); groupUIDs.Add(uid)? unique++ : dupes++; At compile time, it generates the error: Only assignment, call, increment, decrement, and new object expressions can be used as a statement HashSet.Add is documented to return a bool, so the ternary (?) operator should work, and this looks like a completely legitimate way to track the number of unique and duplicate items I add to a hash-set. When I reformat it as a if-then-else, it works fine. Can anyone explain the error, and if there is a way to do this as a simple ternary operator?

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• How do i compile a static library (fat) for armv6, armv7 and i386

  - by unforgiven

  I know this question has been posed several times, but my goal is slightly different with regard to what I have found searching the web. Specifically, I am already able to build a static library for iPhone, but the final fat file I am able to build only contains arm and i386 architectures (and I am not sure to what arm refers: is v6 or v7?). I am not able to compile specifically for armv6 and armv7 and them merge both architectures using lipo. The lipo tool complains that the same architecture (arm, not armv6 or armv7) is present in both the armv6 and armv7 libraries. Can someone explain exactly how to build for armv6 and armv7, and them merge these libraries into a fat file using lipo?

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• What is the relaxation condition in graph theory

  - by windopal

  Hi, I'm trying to understand the main concepts of graph theory and the algorithms within it. Most algorithms seem to contain a "Relaxation Condition" I'm unsure about what this is. Could some one explain it to me please. An example of this is dijkstras algorithm, here is the pseudo-code. 1 function Dijkstra(Graph, source): 2 for each vertex v in Graph: // Initializations 3 dist[v] := infinity // Unknown distance function from source to v 4 previous[v] := undefined // Previous node in optimal path from source 5 dist[source] := 0 // Distance from source to source 6 Q := the set of all nodes in Graph // All nodes in the graph are unoptimized - thus are in Q 7 while Q is not empty: // The main loop 8 u := vertex in Q with smallest dist[] 9 if dist[u] = infinity: 10 break // all remaining vertices are inaccessible from source 11 remove u from Q 12 for each neighbor v of u: // where v has not yet been removed from Q. 13 alt := dist[u] + dist_between(u, v) 14 if alt < dist[v]: // Relax (u,v,a) 15 dist[v] := alt 16 previous[v] := u 17 return dist[] Thanks

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• posix pthreads in c

  - by Codenotguru

  Iam new to c programming and needs some help. long *taskids[NUM_THREADS]; for(t=0; t<NUM_THREADS; t++) { taskids[t] = (long *) malloc(sizeof(long)); *taskids[t] = t; printf("Creating thread %ld\n", t); rc = pthread_create(&threads[t], NULL, PrintHello, (void *) taskids[t]); ... } This code fragment demonstrates how to pass a simple integer to each thread. The calling thread uses a unique data structure for each thread, insuring that each thread's argument remains intact throughout the program. Iam not able to understand how this is happening can somebody explain it??

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• Crystal Report, Group based Summary at report footer

  - by yesosuresh

  HI, Is it possible to display summary of a group at the report footer ? Let me explain the scenario. I've to create the following kind of report: Client Amount Currency Customer 123: WWWW 300 SGD XXXX 400 SGD YYYY 200 USD ZZZZ 300 USD Customer 456: W1W1 300 SGD X1X1 400 SGD Y1Y1 200 USD Z1Z1 300 USD . . . . . At the report footer, I need to show the following: Grand total: USD 1000 Grand total: SGD 1400 Need to display grand total of amount by Currency at Report footer.Is it possible to do in Crystal report? I'm using crystal report version 11. Could anyone suggest me a solution ?

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• Excel / VB - How do I loop through each row/column and do formatting based on the value?

  - by Johnny 5

  Here's what I need to do: 1) Loop through every cell in a worksheet 2) Make formatting changes (bold, etc) to fields relative to each field based on the value What I mean is that if a field has a value of "foo", I want to make the field that is (-1, -3) from it bold, etc. I tried to do this with the following script with no luck. Thanks Johnny Pseudo Code to Explain: For Each Cell in WorkSheet If Value of Cell is 'Subtotal' Make the cell 2 cells to the left and 1 cell up from here bold and underlined End If End ForEach The Failed Macro (I don't really know VB at all): Sub Macro2() ' ' ' Dim rnArea As Range Dim rnCell As Range Set rnArea = Range("J1:J2000") For Each rnCell In rnArea With rnCell If Not IsError(rnCell.Value) Then Select Case .Value Case "000 Total" ActiveCell.Offset(-1, -3).Select ActiveCell.Font.Underline = XlUnderlineStyle.xlUnderlineStyleSingleAccounting End Select End If End With Next End Sub

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• Sending Facebook notifications

  - by antpaw

  Hey i have a little facebook iframe application written with rails and the facebooker plugin. I can loop through the users friends and see whether they also have this application. To do this I use a fql qeury, and my own html (no fbml). Now i want to create a button right beside every friend who doesn't have this app, that sends an invite massage. Is it possible to do this without this FBML/JS voodoo? I looked through the RESTful api but the only thing i could found was this deprecated method :( Can someone provide me an code example on how to do this? I really don't want to use this FBML stuff because it doesn't fit into the ui concept of the app, but if that the only way, please explain how to do this (every fbml tag I've tried is just invisible :( ) Thanks a lot.

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• java generics covariance

  - by soocracy42

  I am having trouble understanding the following article: http://www.ibm.com/developerworks/java/library/j-jtp01255.html Under, Generics are not covariant the author states, Because ln is a List, adding a Float to it seems perfectly legal. But if ln were aliased with li, then it would break the type-safety promise implicit in the definition of li -- that it is a list of integers, which is why generic types cannot be covariant. I can't understand the part where it says "if ln were aliased with li". What does the author means by alias?(reference?). The code snippet above the quoted line seems to illustrate WHAT is illegal in java and not WHY. It would be very helpful to me if somebody could explain with an example. Thanks in advance.

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• Referencing a union inside a structure using union tag gives incorrect address

  - by AlanKley

  I had a need to declare a union inside a structure as defined below: struct MyStruct { int m_DataType; DWORD m_DataLen; union theData { char m_Buff [_MAX_PATH]; struct MyData m_myData; } m_Data; }; Initially, I tried accessing the union data as follows (before I added the m_Data declaration): MyStruct m_myStruct; char* pBuff = m_myStruct.theData::m_Buff; This compiles but returns to pBuff a pointer to the beginning of the MyStruct structure which caused me to overwrite the m_DataType & m_DataLength members when I thought I was writing to the m_Buff buffer. I am using Visual Studio 2008. Can anyone explain this unexpected behavior? Thanks.

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• Why is the user.dir system property working in Java?

  - by Geo

  Almost every article I read told me that you can't have chdir in Java. The accepted answer to this question says you can't do it in Java. However, here's some of the stuff I tried : geo@codebox:~$ java -version java version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode, sharing) Here's a test class I'm using : import java.io.*; public class Ch { public static void main(String[] args) { System.out.println(new File(".").getAbsolutePath()); System.setProperty("user.dir","/media"); System.out.println(new File(".").getAbsolutePath()); } } geo@codebox:~$ pwd /home/geo geo@codebox:~$ java Ch /home/geo/. /media/. Please explain why this worked. Can I use this from now on and expect it to work the same way on all platforms?

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• Does JSONP scale? How many JSONP requests can I send?

  - by Cheeso

  Based on Please explain JSONP, I understand that JSONP can be used to get around the same-origin policy. But in order to do that, the page must use a <script> tag. I know that pages can dynamically emit new script tags, such as with: <script type="text/javascript" language='javascript'> document.write('<script type="text/javascript" ' + 'id="contentloadtag" defer="defer" ' + 'src="javascript:void(0)"><\/script>'); var contentloadtag=document.getElementById("contentloadtag"); contentloadtag.onreadystatechange=function(){ if (this.readyState=="complete") { init(); } } </script> (the above works in IE, don't think it works in FF). ... but does this mean, effectively, that every JSONP call requires me to emit another <script> tag into the document? Can I remove the <script> tags that are done?

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• Why callback functions needs to be static when declared in class

  - by Dave17

  I was trying to declare a callback function in class and then somewhere i read the function needs to be static but It didn't explain why? #include <iostream> using std::cout; using std::endl; class Test { public: Test() {} void my_func(void (*f)()) { cout << "In My Function" << endl; f(); //Invoke callback function } static void callback_func() {cout << "In Callback function" << endl;} }; int main() { Test Obj; Obj.my_func(t.callback_func); }

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• internet explorer ashx file problem

  - by vondip

  My problem is a bit complicated: I am writing in c#, asp.net and using jquery I have a page that sends requests to the server using jquery's ajax method. I have a ashx file (handler) to respond to these request. User can perform several changes on several pages, then use some method that will call the ajax method. My ashx file reads some values From the session variables and acts accordingly. This works fine in all browsers but in internet explorer. In internet explorer the session seems to hold old information (old user ids'). It's incredible, the same code works fine in firefox, chrome and safari but fails with ie. What could be causing it? I have no clue where to even start looking for a solution. btw, Sorry for the general title, couldn't figure out how to explain in just few words. Thank You!

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• Formatting the date in unix to include suffix on day (st, nd, rd and th)

  - by skymook

  How can I add the suffix on the day number of a unix date? I'll explain. I have a TextMate bundle snippit that writes out today's date. It uses unix date and formatting. Here is the code: `date +%A` `date +%d` `date +%B` `date +%Y` It outputs: Monday 22 March 2010 I would like to add the suffix to the day (st, nd, rd and th) like so: Monday 22nd March 2010 As far as I can see, there is no native function in the unix date formatting, like there is in PHP (j). How would I achieve this in unix? A complicated regex on the day number?

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• Programatical authentication in J2EE 6

  - by Kevin

  Hello, is it possible to authenticate programmatically a user in J2ee 6? Let me explain with some more details: I've got an existing Java SE project with Servlets and hibernate; where I manage manually all the authentication and access control: class Authenticator { int Id string username } Authenticator login(string username, string password) ; void doListData(Authenticator auth) { if (isLoggedIn(auth)) listData(); else doListError } void doUpdateData (Authenticator auth) { if (isLoggedAsAdmin(auth)) updateData() ; else doListError(); } void doListError () { listError() ; } And Im integrating J2ee/jpa/servlet 3/... (Glassfish 3) in this project. I've seen anotations like : @RolesAllowed ("viewer") void doListdata (...) { istData() ; } @RolesAllowed("admin") void doUpdateData (...) { updateData() ; } @PermotAll void dolisterror () { listerror() ; } but how can I manually state, in login(), that my user is in the admin and/or viewer role?

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• Understanding NSHTTPCookieStorage for the iPhone

  - by psychotik

  Maybe I'm missing something, but from Apple's documentation for NSHTTPCookieStorage, I can't help but wonder how this is safe to use. Does this mean that cookie storage is shared across all apps on the iPhone? If my app makes an Http call that results in some cookies being saved, do all apps now have access to these cookies? Methods like: cookiesForURL: Returns all the receiver's cookies that will be sent to a specified URL. make it look even more suspicious. Can someone explain how this is OK, and what the class does? Also, assuming my understanding is flawed and this is indeed sandboxed per-app, do calls made using NSURLRequest automatically save/retrieve cookies from this store or is it the developers responsibility to set request headers before dispatching the request?

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• GNU Smalltalk API?

  - by Zachary

  I have recently been learning Smalltalk, mainly by going through the tutorial at gnu.org. While it has been really helpful and I have learned a lot, I would really like an extensive smalltalk API where I could view all of the built in objects and which messages they can receive, and what they will do with those messages. The manual has a list of all of the built in objects, but doesn't really explain anything about them. Some are obvious, like an Array, but I still don't know what all the messages are an Array understands. There is a link to a 'class reference' here, which is generated by Smalltalk, but the link is broken. I was wondering if anyone knows of something like this hosted elsewhere, or could point me towards a similar resource.

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• how to use Facebook.showPermissionDialog(‘publish_stream,read_stream’) in asp.net application for th

  - by ibrahimkhan

  Hi All, I am using Facebook.showPermissionDialog("publish_stream,read_stream"). It is displaying dialog in pageload. In facebook wikipage they are showing ex: Facebook.showPermissionDialog('publish_stream,read_stream', ondone, enableProfileSelector, [1234,2345]); Can any one explain me here : what is - ondone, enableProfileSelector, [1234,2345]);?? i know these[1234,2345] are pageids. How to display these things to pageadmin only.?? Pls help me regarding this. Thanks in advance, Ibrahim.

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• Excel VSTO ->Hide/Unhide Ribbon Button based on another Ribbon Button click

  - by Jignesh

  We are creating Excel 2007 AddIn using VSTO. Now we have a scenario where in there are 2 buttons. Button 'A' and Button 'B'. Button 'B'needs to be hidden based on the click on the button 'A'. But since the ribbon bar is not getting refreshed dynamically we are unable to see the change on the Ribbon Bar. I heard from some blods we need to use callback methods for the same. Could you please explain and put some code snippet on how to do that ? Will highly appreciate if anyone can help asap ...

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• Why Do Browsers Leak Memory?

  - by Dane Balia

  A colleague and I were speaking about browsers (using browser control in a project), and it appears as plain as day that all browsers (Firefox, Chrome, IE, Opera) display the same characteristic or side-effect from their usage and that being 'Leaking Memory'. Can someone explain why that is the case? Surely as with any form of code, there should be proper garbage collection? PS. I've read about some defensive patterns on why this can happen from a developer's perspective. I am aware of an article Crockford wrote on IE; but why is the problem symptomatic of every browser? Thanks

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• Flash ActionScript 2.0 problem with the object's _visible parameter

  - by GMan

  Hey guys, I've been trying to build something simple in Flash 8, and I stumbled across something weird I cannot explain: I have an object, and at some point of the program, I want it to be visible (it is invisible at first), so I write: _root.myObj._visible = true; _root.gameOver.swapDepths(_root.getNextHighestDepth()); //so it will be on the top and this works fine, the object becomes visible and etc. What I planned to happen next is that the user presses a button on that same object, and the object will go invisible: on(release) { trace(_root.myObj._visible); _root.myObj._visible = false; trace(_root.myObj._visible); _root.gotoAndPlay("three"); } The trace returns at first true and later on false, so the command works, but oddly the object stays visible, that's what I don't understand. Thanks everybody in advance.

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