Looking at the javadocs and osgi bundle exports, it looks like this package is not part of the public API of xstream.

Spring OXM is however directly referencing CompositeClassLoader here. I'm using spring with servicemix which includes osgi metadata for the spring bundles and it includes an optional import on this package which it not fulfilled. Using XStreamMarshaller there is not possible because CompositeClassLoader cannot be found.

If this code should not be used by client code, I'll close this and open an issue for the Spring project. Thanks.