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From Chirag Dewan <>
Subject OOME issue in Tomcat 6.0.18(with SSL)
Date Wed, 12 Jun 2013 05:01:14 GMT
Hi All,

I am facing an Out of Memory Issue with my application. I am using Embedded Tomcat 6.0.18.
I have a simple servlet deployed which does nothing but set the HTTPResponse and return it.

Now I have 2 testing clients

Client 1:

HTTPClient 3.1 with MultiThreadedHttpConnectionManager with SSL 
maxConnections = 200

Client 2:

HTTPClient 4.1 in which I configured multiple threads  

                for (int i = 0; i < noofConnections; i++) { 
                Thread t = new Thread(my); 

With every thread executing HTTPGet on the servlet. This too with SSL.

Now with client 1,my JVM crashes after just a few minutes. Running with 8gb heap space. 

I took a heap dump for 2gb heap space using Jmap and analyzed it with MAT. It seems that there
were many instances of org.apache.catalina.session.StandardManager consuming almost 95% of
heap space.

CPU utilization is only 13 -14% and I can see only 65 threads active with netstat.

With Client 2,everything looks fine. Though JVM crashes at 2gb,but at 8gb it works fine. Though
CPU utilization is almost 90% and 100 simultaneous threads created for 100 simultaneous threads. 

Both my server and clients are on Linux 64 bit machines.

I believe that this is something related to the client 1 i.e. either the HTTPClient 3.1 or
the MultiThreadedConnectionManager,but posting here if someone can assist me in what might
be the root cause.

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