This Article is intended for Weblogic Administrators as a quick reference to known issues and their solution or workarounds. This will help in fast and effective resolution of problems
Problem Description: Heap Space Utilization too high (>=95% say)
Solution/Workaround:
- Log on to WebLogic Admin Console
- Go to the server instance for which the heap space utilization increased beyond limit.
- Then go to Tab “Monitoring” > “Performance”
If WebLogic version is 8.1 - You will find graph showing Heap Space utilization
- monitor for sometime if automatic garbage collection runs
- If not, then click on the “Force Garbage Collection” Button
- Heap space utilization will reduce sharply.
- Monitor for sometime.
- If WebLogic 9.x/10
- HeapFreePercent parameter will show the current percent of heap space free.
- If it too low (<10) for quite sometime,
- Click on the button “Garbage Collect Forcefully”
- If WebLogic Admin Console is not available (“You are not authorized to View this page” error you are getting when trying to open admin console in internet explorer):
This means, the license of BEA WebLogic installed is “Development License” and the user limit exceeds. (FYI: WebLogic Development license only support requests from specified different IPs at a time, so if that value exceeds, the above error will occur) - Login to the UNIX Box
- Use weblogic.Admin command line utility to monitor and reduce HeapSpace utilization
- Use: java weblogic.Admin –url t3://<Target IP>:<PORT> -username <WL Admin username> -password <admin password> GET –pretty –type JVMRuntime You can see detailed HeapSpace utilization from this output.
- If you need a garbage collection, use the following command:
java weblogic.Admin –url t3://<Target IP>:<PORT> -username <WL Admin username>password <admin password> INVOKE –pretty –type JVMRuntime –method runGC - Again check garbage collection using the first command to see the current garbage collection
