illegalmonitorstateexcep

Threads synchronizing in Java, IllegalMonitorStateException

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问题 I am trying to synchronize two threads - the "Main" thread, and a runnable. I get the IllegalMonitorStateException, but I do not completelty understand what "you do not have the lock of the object" means. Here is my code: public class ThreadsTest { private static ThreadsTest instance; public volatile boolean flag = false; public void doStuff() { System.out.println("first"); this.flag = true; } public Runnable mDrawer = new Runnable() { public void run() { synchronized (ThreadsTest.getInstance

IllegalMonitorStateException notify() and wait() [duplicate]

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问题 This question already has answers here : Java Wait and Notify: IllegalMonitorStateException (2 answers) Closed last year . I have a problem. When I use notify() in synchronized block I have IllegalMonitorStateException. Can anyone help me to solve this problem? I have to do that, one thread will send to second thread char, then this thread has to wait and second thread print this char. After that second thread wait, and first one again send next char Main.java: import java.util.logging.Level;

IllegalMonitorStateException in code

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问题 class Test { public static void main(String[] args) { System.out.println("1.. "); synchronized (args) { System.out.println("2.."); try { Thread.currentThread().wait(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("3.."); } } } I am getting IllegalMonitorStateException monitor exception in this code. As per my understanding, because of synchronized block around args which is string array object, current thread must have

Why does notifyAll() raise IllegalMonitorStateException when synchronized on Integer?

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Why does this test program result in a java.lang.IllegalMonitorStateException ? public class test { static Integer foo = new Integer(1); public static void main(String[] args) { synchronized(foo) { foo++; foo.notifyAll(); } System.err.println("Success"); } } Result: Exception in thread "main" java.lang.IllegalMonitorStateException at java.lang.Object.notifyAll(Native Method) at test.main(test.java:6) You have noted correctly that notifyAll must be called from a synchronized block. However, in your case, because of auto-boxing, the object you synchronized on is not the same instance that you

IllegalMonitorStateException on notify() when synchronized on an Integer

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I'm new to using wait() and notify() in Java and I'm getting an IllegalMonitorStateException. Main Code public class ThreadTest { private static Integer state = 0; public static void main(String[] args) { synchronized(state) { System.out.println("Starting thread"); Thread t = new Thread(new AnotherTest()); t.start(); synchronized(state) { state = 0; while(state == 0) { try { state.wait(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println("State is: " + state); } } } public static class AnotherTest implements Runnable {

Why does notifyAll() raise IllegalMonitorStateException when synchronized on Integer?

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问题 Why does this test program result in a java.lang.IllegalMonitorStateException ? public class test { static Integer foo = new Integer(1); public static void main(String[] args) { synchronized(foo) { foo++; foo.notifyAll(); } System.err.println("Success"); } } Result: Exception in thread "main" java.lang.IllegalMonitorStateException at java.lang.Object.notifyAll(Native Method) at test.main(test.java:6) 回答1: You have noted correctly that notifyAll must be called from a synchronized block.

IllegalMonitorStateException on notify() when synchronized on an Integer

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问题 I'm new to using wait() and notify() in Java and I'm getting an IllegalMonitorStateException. Main Code public class ThreadTest { private static Integer state = 0; public static void main(String[] args) { synchronized(state) { System.out.println("Starting thread"); Thread t = new Thread(new AnotherTest()); t.start(); synchronized(state) { state = 0; while(state == 0) { try { state.wait(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System