The SessionSynchronization interface helps a session bean to synchronize its state with a transaction. The container uses this interface to inform session beans of their transaction boundaries. Only stateful session beans with container-managed transactions can implement this interface. This is because in stateless session beans, transactions must complete before the enclosing method completes, i.e., a transaction cannot remain open across multiple method calls. Also, bean-managed transactions do not implement this interface because codes for starting and ending a transaction are written by a bean provider. A session bean should implement the SessionSynchronization interface only when it needs to know about the transaction boundaries. The methods present in the SessionSynchronization interface are as follows:
- afterBegin()
- beforeCompletion()
- afterCompletion(Boolean committed)
These are callback methods that session beans use to find out when a transaction starts or ends and how it ends.
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