Developing OSGi applications

This page provides a starting point for finding out how to develop OSGi applications.

New feature New feature: The OSGi Applications support in WebSphere® Application Server helps you develop and deploy modular applications that use both Java EE and OSGi technologies. You can design and build applications and suites of applications from coherent, versioned, reusable OSGi modules that are accessed only through well-defined interfaces. This enables the same, or different, applications to use different versions of the same third party libraries without interference.newfeat
Avoid trouble Avoid trouble: You cannot assume that one bundle within an OSGi application will start or stop before another. If your application expects bundles to be started or stopped in a given order, it is unlikely to work in all environments. The Blueprint programming model provides a way of declaring and dealing with inter-bundle service dependencies. If you cannot use Blueprint, you can use the ServiceTracker class, perhaps with an associated ServiceTrackerCustomizer to track services and react to changes in their status.gotcha
Avoid trouble Avoid trouble: OSGi applications have one or more bundles listed in their Application-Content stanza, each with a given version range. The specific version of each bundle in use at a given time can be varied by creating a new deployment as described in Updating bundle versions for an EBA asset. For WebSphere Application Server Version 8.0 and later versions, composite bundles can either be listed in the Application-Content stanza, or added to the deployed OSGi application as an extension. For a given application, you should not extend the application with a composite bundle that is already listed in the Application-Content stanza, and whose version is within the listed range for the composite bundle. If you do this, you might get unexpected results when you update the bundle versions.gotcha



Related information
Developing and deploying an OSGi application


Terms of Use | Feedback

Last updatedLast updated: Sep 19, 2011 5:16:49 PM CDT
http://www14.software.ibm.com/webapp/wsbroker/redirect?version=matt&product=was-base-iseries&topic=welc6tech_osgi_dev
File name: welc6tech_osgi_dev.html