A clip from the release notes:
Large Applications May Require Additional Memory Allocation If you are building and testing a large application, WebLogic Workshop may run out of memory, which can cause it to run slowly or shut down. Workaround: You can increase your memory allocation by modifying the Workshop.cfg file, located in the BEA_HOMEweblogic81workshop directory. Add this flag to the command-line arguments: VM flag -Xmx512m
© Scott S. Nelson