Re: How to get a thread stack dump programmatically

[Rodrigo Ruiz]

My problem is I want a full stack dump, so I need to obtain stack traces 
from all threads, even those out of my control. Specifically, I would 
like to obtain a stack thread from all Tomcat worker threads, and if 
they are in a deadlock state, I cannot print their stack trace from 
within them ;-)

I know it is technically possible, because there are some commercial 
libraries that do it. For example, BEA systems seems to have an 
implementation, as from their javadocs:

http://edocs.bea.com/wljrockit/docs142/jmapi/javadoc/Management%20API/com/bea/jvm/ThreadSystem.html

But I do not know if that implementation is only for their JRockit 
virtual machine, or they use JNI to access internal JVM data, or if 
there is something else involved.

I am implementing a rather complex server, and detecting / reporting a 
deadlock condition would be a great advantage in the development process.

Anyway, thanks for your comments :-)

Thomas Kellerer wrote:

Rodrigo Ruiz schrieb:

Hi all, is there any way to get a stack trace of a given thread?

I want to obtain a full thread stack dump from a JSP, just like the 
one obtained via kill -QUIT, but I do not find any method in the 
Thread class that could be used to get this information.

I seem to recall that some code was posted some time ago in this 
list, but I have not found it in the archives. Any ideas?

PS: What I really want to do is a tool for detecting deadlocks via 
thread dump analysis :-)


Create an exception within that thread, and write it's stack dump via 
a StringWriter into a String

Thomas

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