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Transaction Q

 
Vishakha Ahuja
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An EJB client has no current transaction. It invokes the business method of an EJB using container-managed transaction demarcation. The business method executes within the scope of a transaction. Which of the following are possible values for the bean method's transaction attribute?
a)NotSupported
b)Supports
c)Required
d)RequiresNew
e)Mandatory
Multiple Select - Please select all of the correct answers (this question has 2 correct choices).


 
Joe Nguyen
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Hi Vishakha
Since the business method must be executed within a transaction, I select c and d
require: if client transaction exists, the container will propagate the client transaction. Otherwise, container will create a new transaction.
requireNew: if client transaction exists, the container will suspend the current transaction and create a new one. Otherwise the container will create a new transaction.
Joey
 
scott irwin
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a) NotSupported - would not start a transaction, if one exists it suspended for this method.
b) Supports - would not start a transaction, it executes in the trasactions scope if one is provided (in this case, there is none).
e) Mandatory - a transaction context must exist before the method is called, otherwise an exception (something like transactionrequired) is thrown.
 
It is sorta covered in the JavaRanch Style Guide.
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