To use xmlbeans generated code you need access to the SchemaTypeSystemImpl, which is not imported by the maven-bundle-plugin. So you need to add something like this to the pom:
Also, any package we may have with "impl" or "internal" needs to be explicitly listed in the Export-Packages.
Many problems with building plugins are caused by non-bundle dependencies getting installed in felix rather than bundleized equivalents. Unfortuneately it looks like felix only says "non-framework bundles cannot be started" without telling us the location of the non-bundle. Running
helps to find the bad dependencies. On a related note, generally you have to exclude original jars from the dependencyManagement dependency entry of a bundleized repackaging. This seems like a serious defect in maven-bundle-plugin.