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EJB Transaction

A transaction is a unit of work that consists of a group of activities performed as a unit such that either all or none of them succeed. Every transaction has a beginning and an end. The process of marking the transaction boundaries is known as transaction demarcation. Transactions either commit or roll back to their initial stage. In EJB, a transaction must pass the ACID test.

http://www.ucertify.com/article/EJB-Transaction.html