I have Ant build and execute a java program. This program tries to do something that sometimes hangs, so we execute it in a thread.

actionThread.start();
try {
    actionThread.join(10000);
} catch (InterruptedException e) {
    System.out.println("InterruptedException: "+e.getMessage());
} 
if (actionThread.isAlive()) {
    actionThread.interrupt();
    System.out.println("Thread timed out and never died");
}

The ant call looks like this:

<java fork="true" failonerror="yes" classname="myPackage.myPathName" classpath="build">  
    <arg line=""/>
    <classpath>
        <pathelement location="bin" />
        <fileset dir="lib">
            <include name="**/*.jar"/>
        </fileset>
    </classpath>
</java>

And when this runs I see the "Thread timed out and never died" statement, and I also see the main program finish execution, but then Ant just hangs. Presumably it is waiting for the child threads to finish, but they never will.

How can I have Ant be done once it is done executing main() and just kill or ignore dead threads?