The Java Heap size is not set high enough.
These steps help increase the JVM max heap size from the default of 1 GB.
Heap size specifies the amount of dynamic memory to be made available to the JVM code. For systems with less than 1 GB of physical memory, use a maximum heap size of 256 MB, and an initial heap size of 0 MB.
For systems with 2 GB memory, use a maximum heap size of 768 MB, and an initial heap size of 256 MB.
For larger systems (more than 2GB), use a maximum heap size of 1024 MB, and an initial heap size of 512 MB.
To set the maximum and initial heap size:
Look under the “Web Performance Advisor” Tab:
When it is not possible to change WebSphere Application Server (WAS) JVM heap size via WAS Admin console, the server.xml can be edited in order to increase the JVM maximum heap size. Follow the steps below:
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