Users tried to log on to the development instance an after logging on they get the really helpful message: You have encountered an unexpected error. Please contact your System Administrator for assistance. Digging into the exception log I found this: JBO-29000: Unexpected exception caught: java.lang.NoClassDefFoundError, msg=Could not initialize class oracle.apps.fnd.functionSecurity.User; So I ran autoconfig after seeing a few things about mx paramter in the $CONTECT_FILE. I then started the services again and everything was working fine.Hope this helps anyone who might be scratching their heads about this.
Working my way through the dba day to day activities sharing what I learn along the way. Mostly a place to save my own notes for later use and hopefully someone else might find it useful.