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What is the SessionSynchronization interface?

October 6th, 2008 by uCertify Leave a reply »

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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