If a custom plug-in throws an exception of the class ObjectException or SystemObjectException, multiple stack traces are logged in the server log file, which can make operational management tasks more difficult. For cases where you do not want stack traces to be logged, configure your custom plug-ins to throw exceptions of the class UserException or one of its derived classes (DataModifiedException or ValidationException). This is useful for user errors on the Enterprise Data Manager (EDM). When one of these exceptions is thrown, no stack trace is entered in the log file but an error message still appears on the EDM.
For more information about these exception classes, see the Javadocs for Sun Master Index.