Stop Thread

**TyCox94** · 09-30-2011, 02:11 AM

I'm trying to set up my thread so it can start/interrupted/stop/start/interrupted.... How do I end a Thread? This is what i have so far but it keeps giving errors.

Java Code:

    public void run() {
        
        while (!interrupted()) {
            try {
                System.out.println("asf");
                Thread.sleep(1500);
            } catch (InterruptedException ex) {
                interrupt();
            }
        }
        stop();
    }

Error:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalThreadStateException

**jammas615** · 09-30-2011, 02:13 AM

Try:

Java Code:

Thread.stop();

instead of just stop();

Regards, James

**TyCox94** · 09-30-2011, 02:16 AM

Ok replaced it, but I can't compile. Error with Thread.stop():

non-static method stop() cannot be referenced from a static context

**Norm** · 09-30-2011, 02:18 AM

What method throws the IllegalThreadStateException exception?
What does the API doc for that method say about why it throws that exception?

**jammas615** · 09-30-2011, 02:19 AM

Hmmm. what other code do you have?
Maybe post that, like the main() method and stuff relating to your thread.

**TyCox94** · 09-30-2011, 02:23 AM

This all the code being used except my GUI generated code.

Java Code:

class mainBot extends Thread {
    
    public void run() {
        
        while (!interrupted()) {
            try {
                System.out.println("asf");
                Thread.sleep(1500);
            } catch (InterruptedException ex) {
                interrupt();
            }
        }
        Thread.stop();
    }
}

**Norm** · 09-30-2011, 02:25 AM

What statement throws the Exception?

**TyCox94** · 09-30-2011, 02:26 AM

When I use the sleep() method

**Norm** · 09-30-2011, 02:30 AM

Your first post said you get
Exception in thread "AWT-EventQueue-0" java.lang.IllegalThreadStateException
Where is this exception thrown?
What is the source statement in your program that was executing when the above error happened?

**TyCox94** · 09-30-2011, 02:50 AM

Honestly I haven't got a clue when it's thrown. I don't think it was...?

Java Code:

class mainBot extends Thread {
    
    public void run() {
        
        while (!interrupted()) {
            try {
                System.out.println("asf");
                Thread.sleep(1500);
            } catch (InterruptedException ex) {
                interrupt();
            }
        }
        stop();
    }
}

Ok so i have a start button:

Java Code:

mainBot.start();

and also a stop button:

Java Code:

mainBot.interrupt();

So I run it. Then I click the start button.... Everything works great! So then i click the stop button. The thread stops. Works as needed. Now I try to start(button) the thread again. Doesn't run... error:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalThreadStateException

**Fubarable** · 09-30-2011, 02:52 AM

Originally Posted by TyCox94

Honestly I haven't got a clue when it's thrown. I don't think it was...?

The exception tells you exactly where it's thrown. Please post the entire text of the exception message.

**TyCox94** · 09-30-2011, 02:53 AM

This is the full Exception

Exception in thread "AWT-EventQueue-0" java.lang.IllegalThreadStateException
at java.lang.Thread.start(Thread.java:638)
at mainFrame.jButton1ActionPerformed(mainFrame.java:8 4)
at mainFrame.access$000(mainFrame.java:1)
at mainFrame$1.actionPerformed(mainFrame.java:28)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.jav a:6289)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3267)
at java.awt.Component.processEvent(Component.java:605 4)
at java.awt.Container.processEvent(Container.java:204 1)
at java.awt.Component.dispatchEventImpl(Component.jav a:4652)
at java.awt.Container.dispatchEventImpl(Container.jav a:2099)
at java.awt.Component.dispatchEvent(Component.java:44 82)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:4168)
at java.awt.Container.dispatchEventImpl(Container.jav a:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478 )
at java.awt.Component.dispatchEvent(Component.java:44 82)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.j ava:644)
at java.awt.EventQueue.access$000(EventQueue.java:85)
at java.awt.EventQueue$1.run(EventQueue.java:603)
at java.awt.EventQueue$1.run(EventQueue.java:601)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:617)
at java.awt.EventQueue$2.run(EventQueue.java:615)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectio nPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 614)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:122)

**Norm** · 09-30-2011, 02:54 AM

Read the API doc for the Thread class. Do a Find for :IllegalThreadStateException
See what methods that error is thrown for and read the doc for the reasons why the exception is thrown.

Exception in thread "AWT-EventQueue-0" java.lang.IllegalThreadStateException
at java.lang.Thread.start(Thread.java:638)
at mainFrame.jButton1ActionPerformed(mainFrame.java:84)

EDIT: Just saw your error message posted.
Read the API doc for the Thread class's start method. That is the method causing the exception.

**TyCox94** · 09-30-2011, 03:06 AM

-ops-

Cluster of posts. Sorry about this.

**Norm** · 09-30-2011, 03:08 AM

What state is the thread in when the thread's execution exits the run() method?

**Norm** · 09-30-2011, 03:12 AM

What happened to the doc for some Thread class you posted earlier?
It didn't look like it was from the doc for the start method.

**TyCox94** · 09-30-2011, 03:12 AM

Ok quick question. How do i find the state of my thread?

Java Code:

System.out.println(Thread.State.values().toString());

One second

Java Code:

class mainBot extends Thread {
    
    public void run() {
        
        while (!interrupted()) {
            System.out.println("asf");
        }
        System.out.println(Thread.State.values().toString());
    }

**Norm** · 09-30-2011, 03:14 AM

First you need to see what statement caused the error.
Then you read the API doc for the method that caused the exception and see why it throws the exception.
Then you change your code so it doesn't create the condition for the error.

What does the doc say?

**TyCox94** · 09-30-2011, 03:15 AM

Java Platform SE 6

Thrown to indicate that a thread is not in an appropriate state for the requested operation. See, for example, the suspend and resume methods in class Thread.