Tomcat memory keep growing

Posted on 2001-07-26
Last Modified: 2013-11-24

My situation is once I invoke a servlet, java.exe occupy more memory (from Task Manager). Normal right? But after the servlet done, memory does not be free.
i.e. java.exe memory usage keep growing.

the servlet involves fileoutputstream, printstream and file. I have closed the former two. But I don't know how to close the file.
i.e. I open the file but do not close it.
I think the memory leak problem may due to this.

Anyone please advise what is the problem? or I missed some settings in Tomcat...

Question by:win97a
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Accepted Solution

black earned 25 total points
ID: 6325078
The file object does not need to be closed, only the streams i.e. your fileoutputstream and printstream.
I assume you are reading the input from the file and storing them as String objects, this tends to be a common cause of memory growth. If you have a profiler of the JVM try to get an object count and see which objects keep growing, I've experienced situations where due to debugging or reading file input the number of String objects keeps growing and uses up a lot of the memory.
Try using StringBuffers where you can and see if the memory usage declines.

Assisted Solution

googlyralph earned 25 total points
ID: 6327215

a problem i was made aware of due to a freind working on tomcat is that there is a known memory leak on jdk1.3.1 this may account for your troubles? (assuming you are running 1.3.1 that is... ;-)

Googly Ralph.

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