The mongo-java-driver is distributed with OSGi headers, but it takes some hurdle jumping to get Morphia working alongside it as an OSGi bundle.  It would be helpful if Morphia was more OSGi friendly.  I think this could be accomplished with only a few changes:

1. Add OSGi headers to the Morphia .jar using bnd or maven-bundle-plugin

2. Provide a way to indicate what ClassLoader should be used to instantiate new objects.  Each OSGi bundle has it's own ClassLoader, so a bundle-ized Morphia can't access classes from other bundles by the Thread.currentThread().getContextClassLoader() method.  Morphia could either determine the ClassLoader to use from the Class itself (if known) or by allowing it to be provided explicitly by the user when mapping packages.