Thursday, 23 June 2011

The link between WebSphere Application Server Community Edition and Apache Geronimo

In previous posts I've written on this blog, such as Get OSGi samples running on your machine in 10 minutes and OSGi Bundle Lifecycles I've referred to Apache Geronimo as the light weight application server I've been using.  Geronimo is an open source application server that consumes the Apache Aries project.  However the food chain does not stop there.  An IBM product called WebSphere Application Server Community Edition consumes the Geronimo project.  So what can we infer from this food chain in the future?

Well, Geronimo currently offers full support for the Java EE 6 and enterprise OSGi applications (via integration of Apache Aries).  I asked Kevan Miller, an IBMer who is the PMC Chair of Apache Geronimo and the WebSphere Application Server Community Edition Architect, to clarify the intent for the Community Edition product.  Here's a slide Kevan often uses which carries a clear statement of WAS CE future intents.

I'm looking forward to seeing these functions in WAS CE, particularly the Java EE 6 support and the new OSGi enterprise programming model to WAS CE, in the OSGi platform.

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Monday, 13 June 2011

External Bundle Repositories

An external bundle repository is a location that can host a number of OSGi bundles and an xml file, which describes the bundles in the OSGi Bundle Repository. The xml file specifies the capabilities and requirements of a number of bundles together with their URLs. The bundles can live in the same location or different locations from the xml file.

Apache Aries, WebSphere Application Server V7 + OSGi and SCA Feature Packs and WebSphere Application Server V8 all support external bundle repositories. However, a common frustration among those who use external bundle repositories is the creation of the repository. Emily Jiang, a member of our development team, recently developed a repository generation tool that's worth sharing (instructions can be found on the Apache Aries website). The tool takes a list of URLs and generates a repository xml file describing the URLs. If the given URL is a local file directory, the tool will generate metadata for all valid bundles in that directory, which saves the user significant effort, as they do not need to explicitly list every bundle in the target directory. Subdirectories will be recursed for any bundles that exist higher in the directory structure.

For more instruction about how to administer external bundle repositories, check out the docs for the WebSphere V8 beta infocenter: