Let's just say that you were trying to incorporate a library created for a completely different class of Java application into OSGi such as Spring that was already widely adopted and tested. This explanation works well for simple, single-tier dependencies, but what if the library you're trying to wrap has it's own non-OSGi-ified dependency tree? bndtools has an excellent overview of the process for wrapping an external library. Wrapping a library as a bundle is the process of producing a bundle JAR with the correct manifest for a library that was not created to work with OSGi. To enable the container to generate these classloaders and understand the connection between the (potentially hundreds) of bundles in the container, each bundle contains a manifest including the packages that bundle imports and exports. Each bundle (essentially a Java Jar with a more complicated manifest) has it's own classloader, allowing the bundle to operate with just it's required dependencies and allowing multiple versions of the same package to be present in the OSGi container at one time. Whilst I can't help with the anxiety of cramming for tests or the pain of getting wisdom teeth pulled, I can give you a leg up on wrapping your library as an OSGi bundle.įirst though, what is an OSGi bundle and what do I mean by wrapping my library?Ĭlassloaders in OSGi work differently than classloaders in "vanilla" Java. Taking standardized tests, getting wisdom teeth out, wrapping libraries as OSGi bundles at times we all must endure dinner pain.
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