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Transaction attributes

 
sonali rao
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I came across this question in a mock exam.
Which of the following EJB Transaction Attributes ensures that the method call always takes place in a transaction, either client started, or container started? Select 2 correct Choices.
1.TX_MANDATORY

2.TX_REQUIRED
3.TX_REQUIRES_NEW
Answer given: 2,3.
Why is not 1 a valid option.
 
Anselm Paulinus
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TX_REQUIRED and TX_REQUIRES_NEW will always run in a transaction. TX_REQUIRED will start a new transaction where non exists and TX_REQUIRES_NEW will always run in a new transaction irrespective of whether one exists or not but TX_MANDATORY will throw an exception if called without an existing transaction.
 
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