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Java Heap Space - OutOfMemory Error

Keerthi Subramanian

Joined: Jun 22, 2007
Posts: 4
When I start my web application in Tomcat5.5, I am getting outofmemory error. I increased heap size to 1.5G in catalina.bat as below
set CATALINA_OPTS="-Xms1024m -Xmx1536m", but stil the same error. When I checked JConsole, the max memory commited is showing as 65MB instead of 1.5GB. any idea what is going wrong, is that catalina options is not taken into account. any help is appreciated.

Nitesh Kant

Joined: Feb 25, 2007
Posts: 1638

Since this question is specific to Tomcat, I have moved it to an appropriate forum for you.

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Josh Wild

Joined: May 27, 2008
Posts: 7
In addition to increasing heap size, you can try increasing "perm size", a memory area which sits next to the heap. All the binary code of currently running classes is archived in the �perm� area.

The �perm� area is important if your application or any of the third party jar files you use dynamically generate classes. For example: �perm� space is consumed when XSLT templates are dynamically compiled into classes, J2EE
application servers, JasperReports, JAXB etc use Java reflection to dynamically generate classes and/or large amount of classes in your application.

To increase perm space:

Java -XX:PermSize=256M -XX:MaxPermSize=256M or make an appropriate change in catalina.bat
Nitesh Kant

Joined: Feb 25, 2007
Posts: 1638

Keerthi: I am getting outofmemory error

Its always better to TellTheDetails. Can you give us the stack trace.
If it is a perm gen out of memory, the error would have specified it and it would have been easy to tell you straight away that you need to increase the perm gen size.
I agree. Here's the link:
subject: Java Heap Space - OutOfMemory Error
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