The OSGi Applications support in WebSphere® Application Server helps you to develop and deploy modular applications that use both Java™ EE and OSGi technologies.
OSGi technology has long been associated with solving application development challenges around complexity, extensibility, and maintenance. Since WebSphere Application Server Version 6.1, OSGi technologies have been used internally as an infrastructure foundation to build the application server product as a component-based run time. In 2007, the OSGi Alliance Enterprise Expert Group (EEG) was formed to bring OSGi infrastructure benefits to enterprise application developers in the form of an enterprise Java programming model. The EEG has focused on the specification of common Web applications technologies for an OSGi environment, including the Blueprint component model. This model standardizes many of the simplicity and unit test benefits of dependency injection frameworks, and is now part of the OSGi Service Platform Release 4 Version 4.2.
Apache Aries is an open community project that brings the modularity, dynamism, and versioning capabilities of the OSGi service platform to enterprise application developers by implementing the EEG specifications. Apache Aries delivers a simple to use and lightweight programming model for Web applications that combines the standard Blueprint component model with familiar Java enterprise technologies. Apache Aries includes an implementation of the OSGi 4.2 Blueprint component model for fine-grained assembly, and provides an assembly model for applications that consist of multiple modules.
The Feature Pack for OSGi Applications and Java Persistence API (JPA) 2.0 integrates Apache Aries technologies into WebSphere Application Server. These technologies include the OSGi Blueprint Container and the Apache Aries application assembly model. This feature pack works with the enterprise-level qualities of service of the product to give the most complete and robust enterprise server for modular Web applications. As well as being easy to use, the integration of Apache Aries into WebSphere Application Server also addresses many of the challenges of developing and maintaining extensible Web applications. You can use this feature pack to deploy and manage Web applications as a set of versioned OSGi bundles. You can also configure one or more bundle repositories, as part of the provisioning infrastructure, to host common bundles that multiple applications use, and to simplify the deployment of applications that use those common bundles.
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