Dismiss
The InnovationQ application will be updated on Sunday, May 31st from 10am-noon ET. You may experience brief service interruptions during that time.
Browse Prior Art Database

Automatic failure diagnosis and resume for message processing in message driven bean scenarios

IP.com Disclosure Number: IPCOM000016313D
Original Publication Date: 2002-Nov-14
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue

IBM

Abstract

Introduction This section gives a short introduction into the main concepts and terminology used in this article. Message Driven Beans TM Message Driven Beans (MDB) were introduced with Sun’s EJBTM 2.0 Specification, see [1]. MDBs are special Enterprise JavaBeans (EJB), i.e. pieces of code that implement certain interfaces so that they can run within a so called EJB Container runtime. In difference to the session beans and entity beans , the MDBs support an asynchronous programming model. A MDB object provides an onMessage method that is asynchronously invoked and executes upon receipt of a single client message. Although MDBs are short-lived stateless objects that do not represent database data directly, methods can access such data in a transaction-aware way. The container creates a new transaction before the message is sent to the onMessage method of MDBs with container-managed transactions.(In this article we don’t use bean-managed transactions.). The transaction is committed after if onMessage returns properly. The MDB than can cause a transaction rollback by invoking a setRollbackOnly method on a certain context object. If a transaction is rolled back, the message stays in the input queue and will be posted to the MDB again.