Comment #13 on issue 493 by protobuf-java (2.5.0) GeneratedMessage#getUnknownFields() not implemented

The "can only use one version" issue is not a problem specific to protobuf; it's a general problem with common libraries. In cases where the common library objects are externally used, you're pretty much stuck with picking a version and making sure everything is OK with that. For cases where the dependencies are purely implementation dependencies, you can either isolate the libraries in separate classloaders, or use something like "jarjar" so the dependencies don't collide.

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