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Question on Whether a Message Driven Bean can have Message Driven Bean as Superclass

 
Mohit G Gupta
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Source: EJB 3.1 Specification


5.6 The Responsibilities of the Bean Provider

5.6.2 Message-Driven Bean Class

The message-driven bean class may have superclasses and/or superinterfaces. If the message-driven bean has superclasses, the methods of the messagelistener interface, lifecycle callback interceptor methods, timeout callback methods, the ejbCreatemethod, and the methods of the Mes-sageDrivenBeaninterface may be defined in the message-driven bean class or in any of its super-classes.
A message-driven bean class must not have a superclass that is itself a message-driven bean class


5.6.3 Message-Driven Bean Superclasses

A message-driven bean class is permitted to have superclasses that are themselves message-driven bean classes


The above 2 statements seems to be contradictory.

Please advise how these 2 statements(italicized) are possible.
 
Frits Walraven
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In 5.6.2. it is specified that certain methods can be defined on a superclass. Like the onMessage() method is allowed to be on a superclass as long as the superclass is not a Message Driven Bean. In that case the onMessage() method won't be inherited.

In 5.6.3. it is specified that a Message Driven Bean can have a MDB as superclass which is merely a convenient use of implementation inheritence.

Regards,
Frits
 
Mohit G Gupta
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Thanks Frits
 
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