problem regarding batch file

[pvsr rao]

i have to execute two batch files.after the first batch file is executed and after some time second batch file should be executed .when iam giving wait() for second batch exception is comming
Process p1=r.exec("d:/surya/a.bat");
Process p2=r.exec("c:/suresh/c.bat");
the exception is
java.lang.IllegalMonitorStateException: current thread not owner
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:429)
at swings.swing1.actionPerformed(swing1.java:184)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5100)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

please tellme what is the problem.

[Jeff Albertson]

Do you understand why one of the following methods works and the other
throws that exception?

public class Test {
    public static void main(String[] args) {
        Test app = new Test();
        app.synch(); //versus
        app.synch();
    }
 
    synchronized void synch() {
        f();
    }
 
    void nosynch() {
        f();
    }
 
    void f() {
        try {
            wait(1000);
        } catch (InterruptedException e) {
            System.out.println("interrupted");
        }
    }
}

[pvsr rao]

when i executed your program no output is comming. when synchronized keyword is given one method is executed after the other.but inmy program also i have givenlike that.but the exception is comming.please tellme how to solve this problem

[Ernest Friedman-Hill]

The answer is, I think, that wait() doesn't do what you think it does. Rather than teach you about wait(), I'll just tell you that the correct method for you to use is the static Thread.sleep() method. You'll have to catch InterruptedException when you call it.

[pvsr rao]

my program is using swings.iam not using threads.if i have to use threads ia have to implement runnable interface.when iam giving that interface it is giving error as classname is not abstract and does not override run(). if i have given my class name as abstract we should not create an object for that class.but iam instantiating my class.please tell me how to solve this problem.my class is extending JFrame.so we should not give extends Thread class

[Ernest Friedman-Hill]

As I said, Thread.sleep() is a static method. Just call it.

Thread.sleep(1000); // Pauses for one second

You don't need to use Threads otherwise.

Of course, you shouldn't sleep or wait (or execute processes, for that matter!) on the event thread, as this will make your program appear to "lock up." You need to do this kind of thing in a separate thread anyway.

[pvsr rao]

according to your suggestion i have called Thread.sleep(10000)eventhough the eception is raising.iam providing that exception also
ava.lang.IllegalMonitorStateException: current thread not owner
at java.lang.Object.notify(Native Method)
at swings.swing1.actionPerformed(swing1.java:190)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5100)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
please help me to solve this as iam trying for this since 1 day

[Ernest Friedman-Hill]

Originally posted by pvsr rao:

java.lang.IllegalMonitorStateException: current thread not owner
at java.lang.Object.notify(Native Method)
at swings.swing1.actionPerformed(swing1.java:190)

This trace says that at line 190 of swing1.java, you're calling "notify" without holding the monitor of the object on which you're calling it -- i.e., you're calling x.notify() outside of a synchronized method of x or a synchronized(x) block.

Now why are you calling "notify", if you're no longer calling "wait"?

[pvsr rao]

Thankyou for sending. i have forgotten to delete notify().now it is working fine