Threadproblem - java.lang.IllegalMonitorStateException

Question

does anybody know why i'm getting a IllegalMonitorStateException here:
public class Test()
private TestThread test = null;
public Test()
test = new TestThread()
test.start();
foo();
private foo()
test.notify();
public class TestThread
extends Thread
private synchronized void doIt()
try
wait();
catch (InterruptedException e)
System.out.println("check");
public void run()
while (true)
doIt();
}

Answer 1

test.notify();To call the notify method you must have the monitor of the object. You gain the monitor through e.g. the synchronized-statement:
synchronized (test) {
test.notify();
See the API documentation of the Object.notify method and the threading tutorial for details:
http://java.sun.com/j2se/1.4.2/docs/api/
http://java.sun.com/docs/books/tutorial/essential/threads/multithreaded.html