jrockit

JRockit JVM versus HotSpot JVM

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JRockit was originally developed by Appeal and BEA Systems before being acquired by Oracle to run server software.1 It was meant to be optimized for large applications requiring long running tasks, a lot of memory and a scalable environment, pushing optimizations for these scenarios even further than the Sun HotSpot JVM in server-mode (see also: … Read more

Dealing with “java.lang.OutOfMemoryError: PermGen space” error

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The solution was to add these flags to JVM command line when Tomcat is started: -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled You can do that by shutting down the tomcat service, then going into the Tomcat/bin directory and running tomcat6w.exe. Under the “Java” tab, add the arguments to the “Java Options” box. Click “OK” and then restart the service. … Read more