Comment #10 on issue 493 by protobuf-java (2.5.0) GeneratedMessage#getUnknownFields() not implemented

Protoc and the runtime together forms the protobuf library. Taking protoc in one version and trying to use it with the runtime in another version is like taking half of a library, then taking another half from the same library but in a different version and expecting that to work. AFAIK, protobuf has never tried to provide such compatibilities. Protobuf generated code and the runtime are strictly tied together both in its design and implementation. The connection between generated code and the runtime library is protobuf internal implementation details. It's not part of the protobuf API and we don't guarantee it to be stable. Users who experience this problem should update their project to use the same version for both halfs of protobuf library instead.

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