AddShutdownHook and setUncaughtExceptionHandler not working properly in java

Question

I have a multi-threaded program where I have one thread to view multiple threads. The work is done as follows:

The main program initiates and runs Watcher Thread, in void Main (), I have a line

Runtime.getRuntime().addShutdownHook(new Thread(new ShutdownThread(), "Exit Listener"));

When I do not start the observer thread, ShutdownThread is called when I exit the program, but when I start the Watcher thread that has a dead loop, ShutdownThread is not called (I print a message in this thread). It is very strange. Any explanation?

The observer stream is similar:

public void run(){
   boolean running=false;
   thread a=new thread(...); //Do the same thing for b, c, d...
   while(true){
   if (a.isActive()){
     if (running)
        thread a= new thread(...);
     a.start();
     running=true;
   }
   Thread.sleep(1000); //try catch block...
}

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setUncaughtExceptionHandler . , . . :

    public static class ErrHandler implements Thread.UncaughtExceptionHandler{
    public final void uncaughtException(Thread t, Throwable e) {
            Error(t + "died, threw exception: " + e);
        }
    }//this is in public class globals

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producer.setUncaughtExceptionHandler(Globals.errhandler);

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Answer 1

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