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Enterprise JavaBeans 3.1, 6th Edition
book

Enterprise JavaBeans 3.1, 6th Edition

by Andrew Lee Rubinger, Bill Burke
September 2010
Intermediate to advanced content levelIntermediate to advanced
766 pages
18h 35m
English
O'Reilly Media, Inc.
Content preview from Enterprise JavaBeans 3.1, 6th Edition

Nontransactional EJBs

Beans outside of a transaction’s scope normally provide some kind of stateless service that does not manipulate data in a data store. While these types of enterprise beans may be necessary as utilities during a transaction, they do not need to meet the ACID requirements. Consider a nontransactional stateless session bean, the QuoteEJB, which provides live stock quotes. This EJB may respond to a request from an EJB involved in a stock purchase transaction. The success or failure of the stock purchase as a transaction will not impact the state or operations of the QuoteEJB, so it does not need to be part of the transaction. Beans that are involved in transactions are subjected to the isolated ACID property, which means that their services cannot be shared during the life of the transaction. Making an enterprise bean transactional can be expensive at runtime. Declaring an EJB to be nontransactional (i.e., NotSupported) leaves it out of the transaction scope, which may improve the performance and availability of that service.

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Publisher Resources

ISBN: 9781449399139Errata Page