Problem: java.lang.OutofMemory exception
Explanation: When running a large number of Access Manager for WebLogic Server sessions, Oracle WebLogic Server may run out of heap space.
Solution: Increase the maximum heap size option for the Java Virtual Machine (JVM) in the startWebLogic script.
%JAVA_HOME%\bin\java -ms64m -mx128m -xms200m -xx:MaxPermSize=128m
Edit setDomainEnv.sh or startWeblogic.sh or your customized scripts if there is any for this parameter.
Consult the Oracle product documentation for recommended heap size, based on application architecture, the number of memory-intensive processes running on the host system, and the version of Oracle WebLogic Server. Applications should be stress-tested to determine the appropriate heap size for their environment.