When a J2EE web application is deployed into the WebSphere Application Server 7 (WAS), the WAS started to load very slow and keep hanging for whatever actions selected, end with a “
java.lang.OutOfMemoryError” error message in the WebSphere’s log file.
The default WebSphere’s Java Virtual Machine memory is not enough; you should adjust more memory to your WebSphere Application Server. See following guide to increase WebSphere’s JVM memory.
1. In WebSphere web console, select Servers -> Server Types -> WebSphere application servers -> Server Infrastructure -> Java and Process Management -> Process definition.
2. In Additional Properties section, select Java Virtual Machine
3. In General Properties section, put 256 for “Initial heap size” and 1024 for “Maximum heap size”.
Done, restart WebSphere.