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How to determine transaction attribute of methods of sub-class in case of method overriding.

 
Mohit G Gupta
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EJB 3.1 Specification

13.3.7.1 Specification of Transaction Attributes with Metadata Annotations


If the bean class has superclasses, the following additional rules apply.

1. A transaction attribute specified on a superclass S applies to the business methods defined by S. If a class-level transaction attribute is not specified on S, it is equivalent to specification of TransactionAttribute(REQUIRED)on S.
2. A transaction attribute may be specified on a business method M defined by class S to override for method M the transaction attribute value explicitly or implicitly specified on the class S.
3. If a method M of class S overrides a business method defined by a super-class of S, the transaction attribute of M is determined by the above rules as applied to class S

The example provided in the above section is :



Solution:Assuming aMethod, bMethod, cMethod are methods of interface A, their transaction attributes are
REQUIRED, SUPPORTS, and REQUIRES_NEW respectively.

Question:How is transaction attribute of aMethod is "REQUIRED" ?
As per my understanding,since super class has SUPPORTS transaction attribute ,then all its methods will have the same Transaction Attribute
and aMethod of class Abean that overrides the aMethod of class SomeClass has no transaction attribute specified ,then aMethod transaction attribute should be SUPPORTS .
 
Frits Walraven
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Question:How is transaction attribute of aMethod is "REQUIRED" ?

As aMethod() is overriden it wil get the default transaction attribute of REQUIRED. Only inherited methods (like bMethod()) get the SUPPORT transaction atribute.

Regards,
Frits
 
Mohit G Gupta
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Hi Frits,

Thanks for the reply.
 
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