Packages 
Package Description
com.sun.messaging
Provides the Oracle GlassFish(tm) Server Message Queue public classes.
com.sun.messaging.bridge.api  
com.sun.messaging.jms
Provides additional Eclipse OpenMQ classes for features that relate to the MQ implementation of the Jakarta Messaging.
com.sun.messaging.jms.management.server
Provides utility/convenience classes for writing JMX based clients to manage or monitor the MQ broker.
com.sun.messaging.jms.notification
Provides a notification API for the MQ client runtime to inform an application about a MQ connection state changes.
com.sun.messaging.xml
Provides additional Oracle GlassFish(tm) Server Message Queue classes for features that relate to XML and SOAP messaging.