JVPARGS configuration parameter

onconfig.std value
None
takes effect
When shared memory is initialized
The JVPARGS configuration parameter provides an easy way for you to set Java™ VM options.Use a semicolon to separate options. For example, if you want to change Xms and Xmx to 32m, you can set those options with the JVPARGS parameter, as the following example shows: 
JVPARGS -Xms32m;-Xmx32m
If you want to see gc information to determine whether you need to increase ms or mx, you can set JVPARGS, as the following example shows: 
JVPARGS -verbose:gc

For more information about Java™ VM options, see your Java™ documentation.