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WebSphere refers to a brand of IBM software products, although the term also popularly refers to one specific product: WebSphere Application Server. WebSphere helped define the middleware software category and is designed to set up, operate and integrate e-business applications across multiple computing platforms using web technologies. IBM constructs WebSphere using open standards such as the Java 2 Platform, Enterprise Edition (J2EE), XML and Web Services standards. Multiple IBM labs around the world participate in designing and developing WebSphere products. IBM has shipped several versions and editions of the application server:
WebSphere Application Server V3.0This version of WebSphere was a JDK 1.2, J2EE 1.0 version. IBM provided many enhancements to the basic J2EE 1.0 spec. WebSphere Application Server V3.5WebSphere Application Server V4.0This was a J2EE 1.1 certified application server. It inherited the database based configuration model from V3.x. WebSphere Application Server V4.0 Enterprise EditionWebSphere Application Server V5.0This was a J2EE 1.2 certified application server. It was a major rewrite of the V3.x,V4.0 code base. The database based configuration repository was replaced with a replication file based configuration repository. A server called the deployment manager had the master copy of the cell configuration and nodes had the file they needed for the node copied from this master server when ever they changed. It also included a cut down version of MQ 5.3 called the embedded JMS server. WebSphere Application Server V5.0 Enterprise EditionThis version added a workflow engine for the first time. This wasn't using the BPEL standard yet. It also added the first fully supported application threading model. This was called WebSphere Async Beans. WebSphere Application Server V5.1WebSphere Application Server V5.1.1The main change from 5.1 was a JDK upgrade to 1.4.2. WebSphere Application Server V5.1 Business Integration Foundation EditionThe workflow engine was updated to support BPEL rather than the proprietary FDML format used in V5.0. The product was renamed and repriced also. WebSphere Application Server V5.1 Extended Deployment EditionWebSphere Application Server V6.0This version was released in December 2004. It was a J2EE 1.4 compliant application server. Many programming model extensions previously found in WebSphere Application Server V5.0 Enterprise Edition were moved out of enterprise and into base. These APIs included application profile, startup beans, the scheduler and async beans. The JMS engine was rewritten in 100% Java and it's function greatly enhanced. The clustering was rewritten to use the high availability manager. This manages all singletons in the WebSphere environment and can provide hot recovery for those singletons. See alsoExternal link
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