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From fcxjp <>
Subject tomcat memory leak problem
Date Thu, 05 Feb 2009 16:14:01 GMT

My system environment is: Windows 2000 Server. JDK 1.5, tomcat 5.5, Oracle 9
The problems are:
1. After tomcat was started, the memory of the tomcat was normal, about
200M-300M. But after a certain time(this time was not set), the memory began
to grow, and the growing speed was so fast that in about 5 minites the
maximum would be reached. The difference of this problem with other problems
I've checked is, in other problems, the memory growing speed is continual
and not so fast, while in our problem the memory didn't grow at the
beginning, but after a certain time instead.

2. There is another strange phenomenon here.
We restarted tomcat at 23:30 last night. We checked the log at 8:00 this
morning and found out the system was not used by anyone during this time.
But the memory of tomcat had reached to 1.5G, which is the maximun of
tomcat's memory. Later, after some users began to use this system, tomcat'
memory dropped to 500M+. How and why was the memory collected? 

By the way, we have cheched the code for any optimization, including
StringBuffer, Vector, datasource connections, etc., which only resulted with
a faster response speed for users, not any influence for the memory problem.
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