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From Mark Thomas <>
Subject Re: Blocked threads
Date Wed, 22 Oct 2008 15:39:49 GMT
Darren Kukulka wrote:
> Hi,
> We've got a Tomcat 6.0.13 server running a single application under
> 64-bit windows with 64-bit SUN JDK 1.6_03
> It runs into situations where a large number of blocked threads appear
> that seem to relate to hibernate functions unable to obtain database
> connections/resources.  This leads to the application slowing down
> considerably to the point where we need to restart Tomcat to restore
> service.
> At the moment we are having a performance review of the back-end
> database which runs separately on a SQL Server 2005 server.  We thought
> it would be prudent to see if there is any tuning we could do within
> Tomcat to help alleviate the pain felt by the users.
> Is anybody aware of any parameters that can be utilised, either
> programmatically or through Tomcat configuration?

Sounds like you have a connection leak. There are various techniques for
tracking these down. One I like is setting the connection pool size to 1 in
your dev environment and then running your tests.


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