so many thread are blocked

[bo zhao <so...@gmail.com>]

I used command <jstack> to dump threads of tomcat, and I found that 183
threads are blocked, why?

thread dump like this:

Deadlock Detection:

No deadlocks found.

Thread 2584: (state = BLOCKED)
 - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
imprecise)
 - java.lang.Object.wait() @bci=2, line=485 (Compiled frame)
 - org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=458
(Compiled frame)
 - org.apache.tomcat.util.net.JIoEndpoint$Worker.run() @bci=11, line=484
(Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=662 (Interpreted frame)


Thread 2583: (state = BLOCKED)
 - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
imprecise)
 - java.lang.Object.wait() @bci=2, line=485 (Compiled frame)
 - org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=458
(Compiled frame)
 - org.apache.tomcat.util.net.JIoEndpoint$Worker.run() @bci=11, line=484
(Compiled frame)
 - java.lang.Thread.run() @bci=11, line=662 (Interpreted frame)


Thread 2572: (state = BLOCKED)
 - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
imprecise)
 - java.lang.Object.wait() @bci=2, line=485 (Compiled frame)
 - org.apache.tomcat.util.net.JIoEndpoint$Worker.await() @bci=8, line=458
(Compiled frame)
 - org.apache.tomcat.util.net.JIoEndpoint$Worker.run() @bci=11, line=484
(Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=662 (Interpreted frame)

...


thanks.

RE: so many thread are blocked

["Caldarale, Charles R" <Ch...@unisys.com>]

> From: bo zhao [mailto:somanybut@gmail.com] 
> Subject: so many thread are blocked

> I used command <jstack> to dump threads of tomcat, and I found that 183
> threads are blocked, why?

They're waiting for something to do.  When a request arrives, a waiting thread will be activated to process it.  Look at the <Connector> and <Executor> documentation to learn how to configure things to your liking.

 - Chuck


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