Download Pro (IBM) WebSphere Application Server 7 Internals by Colin Renouf PDF

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By Colin Renouf

IBM WebSphere is a number one Java EE software server that’s used for deploying and management of firm Java functions. WebSphere 7 is predicted to be to be had through June 2009 for Java EE 6 free up, additionally slated round that point. seasoned (IBM) WebSphere software Server 7 Internals by means of Colin Renouf could be first or one of many first books to marketplace on WebSphere 7, as a part of wave of Java EE 6 releases.

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1 PoC Testing LPAR 3 Virtual Ethernet Hypervisor POWER6 Processors Note that the IBM Java 6 J9 JVM-based WAS maps classes from the global area into a WPAR because it uses memory-mapped files for shared classes, but the Java 5-based version uses shared memory, so it is completely isolated. The Virtual Partition Memory feature of the Hypervisor on POWER6 hardware even allows memory to be shared between LPARs. Figure 1-3. 1 runtime underlies WAS, and the WAS code exploits both the Eclipse Extension Registry, which allows code to expose extension points that other code extends, and the OSGi Service Registry, which allows services to be exposed to other components.

Within these containers, the components often declare services to use elsewhere, some of which offer listeners. These components are the basis of all of the functionality within WAS. Of particular interest are the Metadata Service and Application Manager Service—each provided by its own component implementation offering registered service interfaces—that monitor the application environment for deployed object changes and notify registered listeners about any such changes so that the listeners can take appropriate action.

Class sharing) and allows IBM to exploit other optimizations that might not be fully in Sun’s interest to provide. When run on IBM hardware, features in the IBM Hypervisors for virtualization can be exploited. IBM also improves performance through use of the Open Source Apache Harmony code wherever this makes sense. So, for the best performance and features for WAS, it should be run on an IBM JVM on IBM hardware; hence the inclusion of this chapter about the IBM J9 JVM in a book about the internals of WAS.

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