When encounter this message in Eclipse trying to start OC4J 10.

(SEVERE) Failed to set the internal configuration of the OC4J JMS Server with:
XMLJMSServerConfig[file:/C:/oc4j_1013/j2ee/home/config/jms.xml]
Error starting JMS-Server...

Just goto the OC4J_HOME\j2ee\home\persistence , and delete everything there. It should clear things up.