In the Administrative console, go to Servers | Server Types | WebSphere application servers | <server_name>.
Then, under Server Infrastructure, go to Java and process management | Process definition, select Java Virtual Machine (application server), and then set the field values for the JVM settings as required and click OK:
Click Save to retain the changes. You must restart the application server for all JVM parameter changes to take effect.
| JVM parameter | Description |
| Verbose class loading | Turns on verbose debug output for class loading. The default is not to enable verbose class loading. |
| Verbose garbage collection | Sets verbose debug output for garbage collection. The default is not to enable verbose garbage collection, as it involves a performance hit on the application server. |
| Verbose JNI | Specifies verbose debug output for native method invocation. This is only used if you wish to understand what is happening with external libraries that your application may be calling. |
| Initial heap size | Size in Megabytes of the minimum memory allocated to the JVM’s heap. |
| Maximum heap size | Size in Megabytes of the maximum JVM heap size. |
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