V Bel

Yes I am working on that too.
Any suggestions on that. ?
Any useful links ?
Thanks

Great Worked for my case...
I am posting the code for further reference for other googlers. I modified your code for the infinite while loop.

import java.io.*; import java.util.*; /// Kill a thread after a given timeout has elapsed // <P> // A simple timeout class. You give it a thread to watch and a timeout // in milliseconds. After the timeout has elapsed, the thread is killed // with a Thread.stop(). If the thread finishes successfully before then, // you can cancel the timeout with a done() call; you can also re-use the // timeout on the same thread with the reset() call. // <P> // <A HREF="/resources/classes/Acme/TimeKiller.java">Fetch the software.</A><BR> // <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A> public class TimeKiller implements Runnable { private Thread targetThread; private long millis; private Thread watcherThread; private boolean loop; private boolean enabled; /// Constructor. Give it a thread to watch, and a timeout in milliseconds. // After the timeout has elapsed, the thread gets killed. If you want // to cancel the kill, just call done(). public TimeKiller( Thread targetThread, long millis ) { this.targetThread = targetThread; this.millis = millis; watcherThread = new Thread( this ); enabled = true; watcherThread.start(); // Hack - pause a bit to let the watcher thread get started. try { Thread.sleep( 100 ); } catch ( InterruptedException e ) {} } /// Constructor, current thread. public TimeKiller( long millis ) { this( Thread.currentThread(), millis ); } /// Call this when the target thread has finished. public synchronized void done() { loop = false; enabled = false; notify(); } /// Call this to restart the wait from zero. public synchronized void reset() { loop = true; notify(); } /// Call this to restart the wait from zero with a different timeout value. public synchronized void reset( long millis ) { this.millis = millis; reset(); } /// The watcher thread - from the Runnable interface. // This has to be pretty anal to avoid monitor lockup, lost // threads, etc. public synchronized void run() { Thread me = Thread.currentThread(); me.setPriority( Thread.MAX_PRIORITY ); if ( enabled ) { do { loop = false; try { wait( millis ); } catch ( InterruptedException e ) {} } while ( enabled && loop ); } if ( enabled && targetThread.isAlive() ) targetThread.stop(); } /// Test routine. public static void main( String[] args ) { System.out.println( (new Date()) + " Setting ten-second timeout..." ); TimeKiller tk = new TimeKiller( 100 ); /** User code will go here or the code which will generate the infinite loop.... */ int i = -1; try { while(i<0) { System.out.println("I am in a loop "); } } catch ( ThreadDeath e ) { System.out.println( (new Date()) + " Caught ThreadDeath" ); throw e; } } }

Thanks a lot. This is really helpful.

If you are using gmail and if you see the mailed by portion when you get a mail you will see a different server than the mailers domain.
So you can easily detect that this email is not the real one.

I am making a website which has java puzzles like "fill in the missing code".
I am compiling and executing the programs online and displaying the results with respect to some test cases.
My problem is when a user tries to implement a program which goes into a infinite loop.
eg,
int i = -1 ; while(i<0) { print ("Anything ") }
I want to know how I can time out programs while they are executing so I can halt the execution of programs which exceed a certain timeout or my web server will become too slow if such infinite loops are allowed to be compiled.