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My exam cloud mock 4, transaction attributes

 
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Given the following stateful session bean:
10.@Stateful
11.@TransactionAttribute(TransactionAttributeType.SUPPORTS)
12.public class OrderManagerBean implements OrderManager{
13. //insert code here
14.public void processOrder(OrderVo orderVo){}

}
Assuming no other transaction-related metadata, which code can be added to line 13 to guarantee that business method processOrder will execute only if invoked with an active transaction?
A.@TransactionAttribute()
B.@TransactionManager(TransactionAttributeType.CONTAINER)
C.@TransactionAttribute(TransactionAttributeType.MANDATORY)
D.@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)

Given answer :c



I think the answer can be C and D.
If processOrder is not invoked in a transaction, then the container will create a transaction and run this method.
 
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