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Today it is not possible to add properly Attributes/Operations to StandardMBean. A bug has been logged http://www.netbeans.org/issues/show_bug.cgi?id=69907 We should support the add Attribute/Operation for this kind of MBean too.
The logged bug is 69905 not 69907. A bug has been logged http://www.netbeans.org/issues/show_bug.cgi?id=69905