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jdiscuss question

 
preethi bhat
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i cannot solve this question
http://jdiscuss.com/Enthuse/jsp/ShowAvailableTests.jsp
Test - 3
Question - 2
(sorry for the inconvinience i cannot paste it as it has figures)

can some one explain the basic principle.
 
Anshul puri
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The question has to do with the transaction attributes for methods in a CMT bean.

methodA : RequiresNew
methodB : Required
methodC : NotSupported
methodD : RequiresNew

methodA calls methodB. methodB calls methodC and methodD.

1. methodA runs in TxA.

2. Since methodB's transaction attribute is Required and it is called from methodA with an existing transaction context TxA, methodB runs in that existing transaction of TxA.

3. methodC's transaction attribute is NotSupported and it is called from methodB. Since there is an existing transaction TxA for methodB, the context for the caller method (methodB) will be suspended in this case and methodC will run in an "unspecified transaction context" .

4. methodD's transaction attribute is RequiresNew and it is called from methodB. Since there is an existing transaction TxA for methodB, the caller's (methodB) transaction TxA gets suspended, and methodD will run with a new transaction TxD.


So, the correct answer is :
methodA (TxA) --> methodB (TxA)
methodB (TxA) --> methodC (no transaction context)
methodB (TxA) --> methodD (TxD)
 
preethi bhat
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thank u Anshul
 
It is sorta covered in the JavaRanch Style Guide.
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