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  • Microsoft Access and Java JDBC-ODBC Error

    - by user1638362
    Trying to insert some values in a Microsoft access database using java. I can an error however, java.sql.SQLException: [Microsoft][ODBC Driver Manager] The specified DSN contains an architecture mismatch between the Driver and Application Exception in thread "main" java.lang.NullPointerException To create the data source im using SysWoW64 odbcad32 and adding it the datasource to system DNS. I say this as i have seen else where there are problems which occur with 64bit systems. However it still doesn't work for me. Microsoft Office 32bit. import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement; public class RMIAuctionHouseJDBC { /** * @param args */ public static void main(String[] args) { String theItem = "Car"; String theClient="KHAN"; String theMessage="1001"; Connection conn =null; // Create connection object try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); System.out.println("Driver Found"); } catch(Exception e) { System.out.println("Driver Not Found"); System.err.println(e); } // connecting to database try{ String database ="jdbc:odbc:Driver={Microsoft Access Driver (*.accdb)};DBQ=AuctionHouseDatabase.accdb;"; conn = DriverManager.getConnection(database,"",""); System.out.println("Conn Found"); } catch(SQLException se) { System.out.println("Conn Not Found"); System.err.println(se); } // Create select statement and execute it try{ /*String insertSQL = "INSERT INTO AuctionHouse VALUES ( " +"'" +theItem+"', " +"'" +theClient+"', " +"'" +theMessage+"')"; */ Statement stmt = conn.createStatement(); String insertSQL = "Insert into AuctionHouse VALUES ('Item','Name','Price')"; stmt.executeUpdate(insertSQL); // Retrieve the results conn.close(); } catch(SQLException se) { System.out.println("SqlStatment Not Found"); System.err.println(se); } } } java.sql.SQLException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified at sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source) at sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source) at sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(Unknown Source) at sun.jdbc.odbc.JdbcOdbcConnection.initialize(Unknown Source)

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  • AccessControlException: access denied - caller function failed to load properties file

    - by Michael Mao
    Hi all: I am having a jar archive environment which is gonna call my class in a folder like this: java -jar "emarket.jar" ../tournament 100 My compiled class is deployed into the ../tournament folder, this command runs well. After I changed my code to load a properties file, it gets the following exception message: Exception in thread "main" java.security.AccessControlException: access denied (java.io.FilePermission agent.properties read) at java.security.AccessControlContext.checkPermission(Unknown Source) at java.security.AccessController.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkRead(Unknown Source) at java.io.FileInputStream.<init>(Unknown Source) at java.io.FileInputStream.<init>(Unknown Source) at Agent10479475.getPropertiesFromConfigFile(Agent10479475.java:110) at Agent10479475.<init>(Agent10479475.java:100) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at emarket.client.EmarketSandbox.instantiateClientObjects(EmarketSandbox.java:92) at emarket.client.EmarketSandbox.<init>(EmarketSandbox.java:27) at emarket.client.EmarketSandbox.main(EmarketSandbox.java:166) I am wondering why this security checking will fail. I issue the getPropertitiesFromConfigFile() function inside my class's default constructor, like this: public class Agent10479475 extends AbstractClientAgent { //default constructor public Agent10479475() { //set all properties to their default values in constructor FT_THRESHOLD = 400; FT_THRESHOLD_MARGIN = 50; printOut("Now loading properties from a config file...", ""); getPropertiesFromConfigFile(); printOut("Finished loading",""); } private void getPropertiesFromConfigFile() { Properties props = new Properties(); try { props.load(new FileInputStream("agent.properties")); FT_THRESHOLD = Long.parseLong(props.getProperty("FT_THRESHOLD")); FT_THRESHOLD_MARGIN = Long.parseLong(props.getProperty("FT_THRESHOLD_MARGIN ")); } catch(java.io.FileNotFoundException fnfex) { printOut("CANNOT FIND PROPERTIES FILE :", fnfex); } catch(java.io.IOException ioex) { printOut("IOEXCEPTION OCCURED :", ioex); } } } My class is loading its own .properties file under the same folder. why would the Java environment complains about such a denial of access? Must I config the emarket.client.EmarketSandbox class, which is not written by me and stored inside the emarket.jar, to access my agent.properties file? Any hints or suggestions is much appreciated. Many thanks in advance.

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  • DateTime c# parsing

    - by Dani
    I try to parse DateTime.TryParse("30-05-2010"), and it throws an exception because it accepts MMddyyyy, and I need ddMMyyyy format. how can I change TryParse format? thanks, Dani

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  • my version of strlcpy

    - by robUK
    Hello, gcc 4.4.4 c89 My program does a lot of string coping. I don't want to use the strncpy as it doesn't nul terminate. And I can't use strlcpy as its not portable. Just a few questions. How can I put my function those its paces to ensure that it is completely safe and stable. Unit testing? Is this good enough for production? size_t s_strlcpy(char *dest, const char *src, const size_t len) { size_t i = 0; /* Always copy 1 less then the destination to make room for the nul */ for(i = 0; i < len - 1; i++) { /* only copy up to the first nul is reached */ if(*src != '\0') { *dest++ = *src++; } else { break; } } /* nul terminate the string */ *dest = '\0'; /* Return the number of bytes copied */ return i; } Many thanks for any suggestions,

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  • PowerShell script failure on remote execution

    - by rinotom
    On executing a PowerShell Remote Script I am getting an error like following Invoke-Command : Exception calling "ToXmlString" with "1" argument(s): "The requested operation cannot be completed. Th e computer must be trusted for delegation and the current user account must be configured to allow delegation. The exact line of code the execution is breaking is as follows: $rsa = New-Object System.Security.Cryptography.RSACryptoServiceProvider $key = $rsa.ToXmlString($true) Can anybody help me to resolve out the issue??

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  • Spring.NET. How actively is it being developed/supported?

    - by Bubba88
    I've made my choice for the developement components on the .NET platform: Spring.NET for IoC and NHibernate for data access. But how safe is it? I've heard here on SO (don't remember which post exactly) that Spring.NET is on its way down, cause for example the Java original version is developed by a large number of people; but (they say that) the sole person behind the .NET version is Mr. Mark Pollack. Is that so? And, if so, does it still make sense to count on Spring.NET for my production applications? if you have similar information about NHibernate, I'll appreciate it; though it seems that the latter is actively supported.

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  • Need help with Java Producer Consumer Problem, NullPointerException

    - by absk
    This is my code: package test; import java.util.logging.Level; import java.util.logging.Logger; class Data{ int ar[]=new int[50]; int ptr; Data() { for(int i=0;i<50;i++) ar[i]=0; ptr=0; } public int produce() { if(this.ptr<50) { this.ar[this.ptr]=1; this.ptr++; return this.ptr; } else return -1; } public int consume() { if(this.ptr>0) { this.ar[this.ptr]=0; this.ptr--; return this.ptr; } else return -1; } } class Prod implements Runnable{ private Main m; Prod(Main mm) { m=mm; } public void run() { int r = m.d.produce(); if (r != -1) { System.out.println("Produced, total elements: " + r); } else { try { wait(); } catch (InterruptedException ex) { Logger.getLogger(Prod.class.getName()).log(Level.SEVERE, null, ex); } } } } class Cons implements Runnable{ private Main m; Cons(Main mm) { m=mm; } public void run() { int r=m.d.consume(); if(r!=-1) System.out.println("Consumed, total elements: " + r); else { try { wait(); } catch (InterruptedException ex) { Logger.getLogger(Prod.class.getName()).log(Level.SEVERE, null, ex); } } notify(); } } public class Main{ Data d; public static void main(String s[]) throws InterruptedException{ Main m = new Main(); Prod p = new Prod(m); Cons c = new Cons(m); new Thread(p).start(); new Thread(c).start(); } } It is giving following errors: Exception in thread "Thread-0" Exception in thread "Thread-1" java.lang.NullPointerException at test.Cons.run(Main.java:84) at java.lang.Thread.run(Thread.java:619) java.lang.NullPointerException at test.Prod.run(Main.java:58) at java.lang.Thread.run(Thread.java:619) I am new to Java. Any help will be appreciated.

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  • access list element from thread

    - by phm
    Hello I have a "List" in the main application and I am trying to access its elements from within a thread. I am getting this exception: {"The calling thread cannot access this object because a different thread owns it."} System.SystemException {System.InvalidOperationException} Thanks

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  • How can JVM arguments be passed to apps started through java webstart in MacOS?

    - by siva
    We have a application which is triggered from browser. This application consumes around 800 mb of memory. This works perfectly when invoked from any browsers in windows OS. The same application when triggered from MacOS throws an out of memory exception which occurs when the application is short of memory. Is there any way to increase the memory allocated for apps running in mac os environment. Also please let me know how JVM arguments can be passed to apps started through java webstart in macOS.

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  • VerifyError When Running jUnit Test on Android 1.6

    - by DKnowles
    Here's what I'm trying to run on Android 1.6: package com.healthlogger.test; public class AllTests extends TestSuite { public static Test suite() { return new TestSuiteBuilder(AllTests.class).includeAllPackagesUnderHere().build(); } } and: package com.healthlogger.test; public class RecordTest extends AndroidTestCase { /** * Ensures that the constructor will not take a null data tag. */ @Test(expected=AssertionFailedError.class) public void testNullDataTagInConstructor() { Record r = new Record(null, Calendar.getInstance(), "Data"); fail("Failed to catch null data tag."); } } The main project is HealthLogger. These are run from a separate test project (HealthLoggerTest). HealthLogger and jUnit4 are in HealthLoggerTest's build path. jUnit4 is also in HealthLogger's build path. The class "Record" is located in com.healthlogger. Commenting out the "@Test..." and "Record r..." lines allows this test to run. When they are uncommented, I get a VerifyError exception. I am severely blocked by this; why is it happening? EDIT: some info from logcat after the crash: E/AndroidRuntime( 3723): Uncaught handler: thread main exiting due to uncaught exception E/AndroidRuntime( 3723): java.lang.VerifyError: com.healthlogger.test.RecordTest E/AndroidRuntime( 3723): at java.lang.Class.getDeclaredConstructors(Native Method) E/AndroidRuntime( 3723): at java.lang.Class.getConstructors(Class.java:507) E/AndroidRuntime( 3723): at android.test.suitebuilder.TestGrouping$TestCasePredicate.hasValidConstructor(TestGrouping.java:226) E/AndroidRuntime( 3723): at android.test.suitebuilder.TestGrouping$TestCasePredicate.apply(TestGrouping.java:215) E/AndroidRuntime( 3723): at android.test.suitebuilder.TestGrouping$TestCasePredicate.apply(TestGrouping.java:211) E/AndroidRuntime( 3723): at android.test.suitebuilder.TestGrouping.select(TestGrouping.java:170) E/AndroidRuntime( 3723): at android.test.suitebuilder.TestGrouping.selectTestClasses(TestGrouping.java:160) E/AndroidRuntime( 3723): at android.test.suitebuilder.TestGrouping.testCaseClassesInPackage(TestGrouping.java:154) E/AndroidRuntime( 3723): at android.test.suitebuilder.TestGrouping.addPackagesRecursive(TestGrouping.java:115) E/AndroidRuntime( 3723): at android.test.suitebuilder.TestSuiteBuilder.includePackages(TestSuiteBuilder.java:103) E/AndroidRuntime( 3723): at android.test.InstrumentationTestRunner.onCreate(InstrumentationTestRunner.java:321) E/AndroidRuntime( 3723): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3848) E/AndroidRuntime( 3723): at android.app.ActivityThread.access$2800(ActivityThread.java:116) E/AndroidRuntime( 3723): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831) E/AndroidRuntime( 3723): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime( 3723): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime( 3723): at android.app.ActivityThread.main(ActivityThread.java:4203) E/AndroidRuntime( 3723): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 3723): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime( 3723): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) E/AndroidRuntime( 3723): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) E/AndroidRuntime( 3723): at dalvik.system.NativeStart.main(Native Method)

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  • Why does this program crash: passing of std::string between DLLs

    - by msiemeri
    Hello together. I have some trouble figuring out why the following crashes (MSVC9): //// the following compiles to A.dll with release runtime linked dynamically //A.h class A { __declspec(dllexport) std::string getString(); }; //A.cpp #include "A.h" std::string A::getString() { return "I am a string."; } //// the following compiles to main.exe with debug runtime linked dynamically #include "A.h" int main() { A a; std::string s = A.getString(); return 0; } // crash on exit Obviously (?) this is due to the different memory models for the executable and DLL. Could it be that the string A::getString() returns is being allocated in A.dll and freed in main.exe? If so, why - and what would be a safe way to pass strings between DLLs (or executables, for that matter)? Without using wrappers like shared_ptr with a custom deleter.

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  • sql locking on silverlight app

    - by immuner
    Hi, i am not sure if this is the correct term, but this is what id like to do: I have an application that uses a mssql database. This application can operate in 3 modes. mode 1) user does not alter, but only read the database mode 2) user can add rows (one at a time) onto a table in the database mode 3) user can alter several tables in the database (one person at a time) question 1) how can i ensure that when a user in in mode 3 that the database will "lock" and all logged in users who operate in mode 2 or mode 3 will not be able to change the database until he finishes? question 2) how can i ensure that while there are several users in mode 2, that there will be no conflict while they all update the table? my guess here, is that before adding a new row, you make a server query for the table's current unique keys and add the new entry. will this be safe enough though? Thanks

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  • how to make IXMLHTTPRequest work over HTTPS, client being WinCE

    - by siddharth
    hi, i am creating a client, which uploads to and dowloads from WinCE client. the code works properly for HTTP but not for HTTPS. Can any one help me about the changes that needs to be done. Code of client on PC : private void btnUpload_Click(object sender, EventArgs e) { try { MSXML2.DOMDocument xmlDOM = new DOMDocumentClass(); xmlDOM.load(txtUpload.Text); MSXML2.IXMLHTTPRequest x = new XMLHTTPClass(); x.open("POST", "http://192.168.1.12/server.asp?cmd=1", false, "", ""); x.send(xmlDOM); string result = x.responseText; if (x.status == 200) { MessageBox.Show(result); MessageBox.Show("upload file successfully"); } else { MessageBox.Show("upload file unsuccessful"); MessageBox.Show(x.status.ToString() + "\n" + x.statusText); } } catch(Exception ex) { MessageBox.Show(ex.Message + "\n" + ex.Data); } } private void btnDownload_Click(object sender, EventArgs e) { try { HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create("http://192.168.1.12/server.asp?cmd=2"); WebReq.Method = "GET"; HttpWebResponse WebResp = null; WebResp = (HttpWebResponse)WebReq.GetResponse(); Stream myResponseStream = WebResp.GetResponseStream(); StreamReader myStreamReader = new StreamReader(myResponseStream); string s = myStreamReader.ReadToEnd(); MessageBox.Show(s); StreamWriter SW; SW = File.CreateText(txtDownload.Text); SW.WriteLine(s); SW.Close(); MessageBox.Show(@"save file at" + txtDownload.Text); myStreamReader.Close(); myResponseStream.Close(); WebResp.Close(); } catch (Exception ex) { MessageBox.Show(ex.Message + "\n" + ex.Data); } The client asp page that acts according to the command is : On Error Resume Next Response.Expires = 0 Dim cmd cmd = Request.QueryString("cmd") if cmd = "2" Then Dim xml_dom1 set xml_dom1 = CreateObject("MSXML2.DOMDocument") xml_dom1.load("\Windows\Config.xml") '(Server.MapPath("Config.xml")) Response.Write(xml_dom1.xml) set xml_dom1 = nothing end if if cmd = "1" Then dim xml_dom set xml_dom = CreateObject("MSXML2.DOMDocument") xml_dom.load(request) xml_dom.save("\Windows\Config.xml") set xml_dom = Nothing end if If err.number < 0 Then Response.Write(err.Description) Response.Write(err.number) End If

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  • Why can i read dirty rows in MySql

    - by acidzombie24
    I cant believe this, i always throught the below would be concurrency safe. I write to a row in one transaction and i am able to read the dirty value from another transaction/command/connection! Why is this possible (not my main question) isnt this not desired and cause more troubles!?! Anyways, i expected that once i write to a row nothing else will be able to read to the row until the transaction is finished. And at least if the row can be still read that the clean (original) value will be read. (but maybe that would cause problems as well if the transaction doesnt use the newly commited data from the other transaction when it is ran) I would like count to == 11. I thought this would be safe in all variants of sql. What can i do to either 1) Not read the dirty value but clean 2) Have that row be locked until the transaction is finished? static MySqlConnection MakeConn() { string connStr = "server=192.168.126.128;user=root;database=TestDB;port=3306;password=a;"; MySqlConnection conn = new MySqlConnection(connStr); conn.Open(); return conn; } static Semaphore sem1 = new Semaphore(1, 1); static Semaphore sem2 = new Semaphore(1, 1); static void Main2() { Console.WriteLine("Starting Test"); // sem1.WaitOne(); Console.WriteLine("1W"); sem2.WaitOne(); Console.WriteLine("2W"); Thread oThread = new Thread(new ThreadStart(fn2)); oThread.Start(); var conn = MakeConn(); var cmd = new MySqlCommand(@" CREATE TABLE IF NOT EXISTS Persons ( P_Id int NOT NULL, name varchar(255), count int, PRIMARY KEY (P_Id) )", conn); cmd.ExecuteNonQuery(); cmd.CommandText = "delete from Persons; insert into Persons(name, count) VALUES('E', '4');"; cmd.ExecuteNonQuery(); cmd.CommandText = "select count from Persons;"; var count = (int)cmd.ExecuteScalar(); Console.WriteLine("Finish inserting. v={0}", count); sem2.Release(); Console.WriteLine("2R"); sem1.WaitOne(); Console.WriteLine("1W"); Console.WriteLine("Starting transaction"); using (var tns = conn.BeginTransaction()) { cmd.CommandText = "update Persons set count=count+1"; cmd.ExecuteNonQuery(); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); sem2.Release(); Console.WriteLine("2R"); sem1.WaitOne(); Console.WriteLine("1W"); count += 5; //10 cmd.CommandText = "update Persons set count=" + count.ToString(); cmd.ExecuteNonQuery(); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); tns.Commit(); } Console.WriteLine("finished transaction 1"); sem2.Release(); Console.WriteLine("2R"); sem1.WaitOne(); Console.WriteLine("1W"); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); sem2.Release(); Console.WriteLine("2R"); //sem1.WaitOne(); Console.WriteLine("1W"); } static void fn2() { int count; Console.WriteLine("Starting thread 2"); sem2.WaitOne(); Console.WriteLine("1W"); var conn = MakeConn(); var cmd = new MySqlCommand("", conn); sem1.Release(); Console.WriteLine("1R"); sem2.WaitOne(); Console.WriteLine("2W"); using (var tns = conn.BeginTransaction()) { cmd.CommandText = "update Persons set count=count+1"; cmd.ExecuteNonQuery(); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); sem1.Release(); Console.WriteLine("1R"); sem2.WaitOne(); Console.WriteLine("2W"); tns.Commit(); } Console.WriteLine("finished transaction 2"); sem1.Release(); Console.WriteLine("1R"); sem2.WaitOne(); Console.WriteLine("2W"); cmd.CommandText = "select count from Persons;"; count = (int)cmd.ExecuteScalar(); Console.WriteLine("count is {0}", count); //should be 11. 4 + 1x2(one each thread) += 5 from first thread == 11 sem1.Release(); Console.WriteLine("1R"); } console Starting Test 1W 2W Starting thread 2 Finish inserting. v=4 2R 1W 1R 1W Starting transaction count is 5 2R 2W count is 6 1R 1W count is 10 finished transaction 1 2R 2W finished transaction 2 1R 1W count is 10 2R 2W count is 10 1R

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  • Seam IllegalStateException: Two components with the same name and precedence

    - by Anand
    Hi, When I run my seam application I get the following error Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener java.lang.IllegalStateException: Two components with the same name and precedence - component name: wizardController, component classes: package.WizardController, package.WizardController at org.jboss.seam.init.Initialization.addComponentDescriptor(Initialization.java:543) at org.jboss.seam.init.Initialization.installScannedComponentAndRoles(Initialization.java:809) at org.jboss.seam.init.Initialization.scanForComponents(Initialization.java:756) at org.jboss.seam.init.Initialization.init(Initialization.java:629) at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:35) I am not able to resolve this problem.

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  • Zend_Search_Lucene and range search

    - by ranza
    I have a bunch of int key fields in my index and trying to do a simple range search like this: `gender:1 AND height:[120 TO 180]` This should give me male in the height range 120 to 180. But for some reason i get this exception: `At least one range query boundary term must be non-empty term` How would i debug this? Is it just Zend_Search_Lucene being buggy?

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  • How should I deploy a patch to a Passenger-based production Rails application without downtime?

    - by Olly
    I have a Passenger-based production Rails application which has thousands of users. Occasionally we need to apply a code patch (we use git) and the current process for doing this (you can assume there are no data migrations) is: Perform git pull origin [production-branch-name] on the server touch tmp/restart.txt to restart Passenger This allows us to patch the server without having to resort to putting up a maintenance page, which is great, but it doesn't feel quite right since it's not actually a proper 'deployment', and we still need to manually update the revision file and our deployment doesn't appear in the Hoptoad or NewRelic services we use. Ideally I would run cap production deploy and just let the standard Capistrano deployment script take care of everything, but is this a dangerous thing to do without putting up a maintenance page? This deployment process seems to be fairly safe in that the new revision is deployed to a completely separate folder and only right at the end of the process is a symlink re-created to switch the currently deployed version, but I'm still fairly paranoid about this somehow resulting in a lost or failed request.

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  • check if a sheet exists in excel

    - by ps
    How do i check if a sheet exists in a excel using interop. I tried the following but it throws an COMException if not there.. Is there a better way of finding out than actually looking at the exception Worksheet sheet = null; Sheets worksheets = some; sheet = (Worksheet)worksheets.get_Item("sheetName"); if(sheet!=null) { //do something }

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  • Safety of Amazon Community AMIs

    - by Koran
    Hi, I am working for a scientific project and would like to use the Amazon EC2 to host the same. Now, I was going through the existing AMIs to create my own, but I found one AMI in the community list of AMIs - which fits perfectly. My question is the following - are the community AMIs safe? Is it possible for a malicious user to create an AMI in such a way that say the usernames/passwords etc can be sent to a remote server or something? Does Amazon do any sort of checking to make sure it cannot happen? I couldnt find the answers to these in Amazon site. I am pretty sure that you guys would have felt the same issues - could you please provide your answers? Regards K

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  • A Question about using jython when run a receving socket in python

    - by abusemind
    Hi, I have not a lot of knowledge of python and network programming. Currently I am trying to implement a simple application which can receive a text message sent by the user, fetch some information from the google search api, and return the results via text message to the user. This application will continue to listening to the users messages and reply immediately. How I get the text short message sent by the user? It's a program named fetion from the mobile supplier in China. The client side fetion, just like a instant communication tool, can send/receive messages to/from other people who are using mobile to receive/send SMS. I am using a open source python program that simulates the fetion program. So basically I can use this python program to communate with others who using cell phone via SMS. My core program is based on java, so I need to take this python program into java environment. I am using jython, and now I am available to send messages to users by some lines of java codes. But the real question is the process of receving from users via SMS. In python code, a new thread is created to continuously listen to the user. It should be OK in Python, but when I run the similar process in Jython, the following exception occurs: Exception in thread Thread:Traceback (most recent call last): File "D:\jython2.5.1\Lib\threading.py", line 178, in _Thread__bootstrap self.run() File "<iostream>", line 1389, in run File "<iostream>", line 1207, in receive File "<iostream>", line 1207, in receive File "<iostream>", line 150, in recv File "D:\jython2.5.1\Lib\select.py", line 223, in native_select pobj.register(fd, POLLIN) File "D:\jython2.5.1\Lib\select.py", line 104, in register raise _map_exception(jlx) error: (20000, 'socket must be in non-blocking mode') The line 150 in the python code is as follows: def recv(self,timeout=False): if self.login_type == "HTTP": time.sleep(10) return self.get_offline_msg() pass else: if timeout: infd,outfd,errfd = select([self.__sock,],[],[],timeout)//<---line 150 here else: infd,outfd,errfd = select([self.__sock,],[],[]) if len(infd) != 0: ret = self.__tcp_recv() num = len(ret) d_print(('num',),locals()) if num == 0: return ret if num == 1: return ret[0] for r in ret: self.queue.put(r) d_print(('r',),locals()) if not self.queue.empty(): return self.queue.get() else: return "TimeOut" Because of I am not very familiar with python, especially the socket part, and also new in Jython use, I really need your help or only advice or explanation. Thank you very much!

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  • In Java What is the guaranteed way to get a FileLock from FileChannel while accessing a RandomAcces

    - by narasimha.bhat
    I am trying to use FileLock lock(long position, long size,boolean shared) in FileChannel object As per the javadoc it can throw OverlappingFileLockException. When I create a test program with 2 threads lock method seems to be waiting to acquire the lock (both exclusive and non exclusive) But when the number threads increases in the acutal scenario over lapping file lock exception is thrown and processing slows down due the block at File lock table. What is the best way to acquire lock avoiding the OverlappingFileLockException ?

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  • Hex web colours

    - by Mick
    Hi I am displaying a colour as a hex value in php . Is it possible to vary the shade of colour by subtracting a number from the hex value ? What I want to do it display vivid web safe colour but if selected I want to dull or lighten the colour. I know I can just use two shades of colour but I could hundred of potential colours . to be clear #66cc00 is bright green and #99ffcc is a very pale green . What do i subtract to get the second colour ? is there any formula because I just can get it . Thanks for any help Cheers

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  • NSInvocationOperation and main thread

    - by kpower
    Imagine that I have a view with some UIKit object as its subview (for example, UIActivityIndicatorView - this doesn't matter). This view also has a selector, called doSomething, which somehow manages UIKit object (in our example it can start or stop indicator view). I create NSInvocationOperation (from view's code parts) with initWithTarget:self selector:@selector(doSomething) object:nil. Then add it to NSOperationQueue. And all works fine. How?! It should be a new thread and non-thread-safe UIKit object! Why no error found (and no crash happened)?

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