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From: "Caldarale, Charles R" <Chuck.Caldarale@unisys.com>
To: Tomcat Users List <users@tomcat.apache.org>
Date: Thu, 17 Sep 2009 12:38:54 -0500
Subject: RE: Object.Wait() in thread dumps...
Thread-Topic: Object.Wait() in thread dumps...
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> From: keeplearning [mailto:p_sodhani@yahoo.com]
> Subject: Object.Wait() in thread dumps...
>=20
> I took the thread dumps and I see most threads are waiting on
> "Object.Wait" as follows:
>=20
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:474) at
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPoo
> l.java:661)
> - locked [0x00002aaac91012b0] (a
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at
> java.lang.Thread.run(Thread.java:595)
>=20
> It looks to me they are waiting for threads.

They aren't "waiting for threads"; those *are* threads, waiting for somethi=
ng to work on.  That's the normal state of a Tomcat thread when no requests=
 are present.

> Also, I am looking at server.xml and I see multiple sections=20
> and not sure where to increase thread number.

If you're not using httpd for anything other than serving static content, c=
onsider just eliminating it and letting Tomcat handle everything.  If, on t=
he other hand, you are using httpd for something useful, then the requests =
for Tomcat will arrive on the AJP <Connector>.  You can tell from the threa=
d dump which <Connector> the threads are associated with.

Also, if you're using Tomcat 6.0.x (you didn't bother to tell us), you can =
configure an <Executor> as a shared thread pool for all <Connector>s.  It's=
 all in the doc.

 - Chuck


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