IllegalMonitorStateException?

[Benjamin John Turner <bj...@WhoWhere.Com>]

	Under moderately heavy load on a single, trivial test servlet, 
I'm getting the following error every once in a while from Tomcat 3.1 
under solaris with Sun's java 1.2. Does anyone know why this is 
happening or what it means?

================
Context log: path="/examples" <b>Internal Servlet Error:</b><br>
<pre>
java.lang.IllegalMonitorStateException: current thread not owner
         at java.lang.String.<init>(Compiled Code)
         at java.lang.StringBuffer.toString(Compiled Code)
         at test.HelloWorld.doGet(Compiled Code)
         at javax.servlet.http.HttpServlet.service(Compiled Code)
         at javax.servlet.http.HttpServlet.service(Compiled Code)
         at org.apache.tomcat.core.ServletWrapper.handleRequest(Compiled Code)
         at org.apache.tomcat.core.ServletWrapper.handleRequest(Compiled Code)
         at org.apache.tomcat.servlets.InvokerServlet.service(Compiled Code)
         at javax.servlet.http.HttpServlet.service(Compiled Code)
         at org.apache.tomcat.core.ServletWrapper.handleRequest(Compiled Code)
         at org.apache.tomcat.core.ContextManager.service(Compiled Code)
         at 
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Compiled 
Code)
         at org.apache.tomcat.service.TcpWorkerThread.run(Compiled Code)
         at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(Compiled Code)
         at java.lang.Thread.run(Compiled Code)
</pre>
=================

		Benjamin Turner
		bjturner@whowhere.com

Re: IllegalMonitorStateException?

[William Brogden <wb...@bga.com>]

Benjamin John Turner wrote:
> 
>         Under moderately heavy load on a single, trivial test servlet,
> I'm getting the following error every once in a while from Tomcat 3.1
> under solaris with Sun's java 1.2. Does anyone know why this is
> happening or what it means?
> 
> ================
> Context log: path="/examples" <b>Internal Servlet Error:</b><br>
> <pre>
> java.lang.IllegalMonitorStateException: current thread not owner
>          at java.lang.String.<init>(Compiled Code)
>          at java.lang.StringBuffer.toString(Compiled Code)
>          at test.HelloWorld.doGet(Compiled Code)
>          at javax.servlet.http.HttpServlet.service(Compiled Code)
>          at javax.servlet.http.HttpServlet.service(Compiled Code)
.... etc
It is something to do with methods that require a Thread to have
obtained a lock on an object (become the owner) - typically 
synchronized blocks, the wait() method or the notify() method
is involved.

-- 
WBB - wbrogden@bga.com  Chief Scientist, LANWrights, Inc.
Java Programmer Certification information and mock exam
at  http://www.lanw.com/java/javacert/