Re: Using "synchronized" but still getting IllegalMonitorStateException

Lew <>
Mon, 6 Apr 2009 11:35:38 -0700 (PDT)
laredotornado wrote:

I'm trying to execute this bit of JUnit test code (Java 1.5):

   public void testEventLoggerFailure() {
           try {

Try using gentler indentation on Usenet!

       synchronized(this) {
         EventLogger el = new EventLogger(null,
       } // synchronized
    } catch (Exception e) {
    } // catch
  } // testEventLoggerFailure

but yet, at the "el.wait()" line the below exceptioin is thrown ...

java.lang.IllegalMonitorStateException: current thread not owner
   at java.lang.Object.wait(Native Method)

Robert Klemme wrote:

You can only wait on the monitor that you are holding, i.e. "this" in
the case above. Frankly, I have no idea what you are trying to achieve
with the code and it seems you do not know how synchronized, wait and
notify work. I suggest you get yourself a copy of Doug Lea's book:

A great book.

You can also refer to the Javadoc for 'wait()':
where it makes the same point.

The Javadocs are the first line of defense against an error in an API

Well, they ought to be, at least.

It's also a good idea for every Java programmer to be cognizant of the
behavior of at least java.lang.Object's methods.


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