Help: Tomcat crashes on java.lang.OutOfMemoryError

I am running an application (i.e. Remedy Midtier) on Tomcat. Currently
I run into the "java.lang.OutOfMemoryError" when performing some
activities from the browser when accessing this application.
Basically, the Tomcat crashes when the java process takes about 160MB -
190MB memory usage (I did monitor the "top" for system resources)

Background information:

OS: Solaris 8
System physical memory: 2048MB
Tomcat version: 4.1.29
JDK version: 1.4.1

/etc/system

set rlim_fd_cur = 65536
set rlim_fd_max = 65536

This is what I have tried so far:

1) Double the heap size in catalina.sh to allocate to java from
"-Xms256m -Xmx512m" to "-Xms512m -Xmx1024m"

2) install jdk 1.4.2

However, the result is: JAVA still fails after taking 160MB-190MB
memory and Tomcat crashes on java.lang.OutOfMemoryError.

Does anyone know what might be the cause of it and how to fix it?

Thanks!

.

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