write the application exception info to a DOM tree and return it
Node appExceptionNode = appendChild(parent, nodeName);
appendTextChild(appExceptionNode, EjbTagNames.APP_EXCEPTION_CLASS,
descriptor.getExceptionClassName());
appendTextChild(appExceptionNode, EjbTagNames.APP_EXCEPTION_ROLLBACK,
Boolean.toString(descriptor.getRollback()));
return appExceptionNode;