Sun Java System Application Server Platform Edition 8.1 2005Q2 Update 2 Developer's Guide

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## MBean Notifications

All AMX MBeans that emit Notifications place a `java.util.Map` within the `userData` field of a standard Notification, which can be obtained via `Notification.getUserData()`. Within the map are zero or more items, which vary according to the Notification type. Each Notification type, and the data available within the Notification, is defined in its respective MBean or in an appropriate place.

Note that certain standard Notifications, such as `javax.management.AttributeChangeNotification` do not and cannot follow this behavior.

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