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Existing generated UML packages such as SysML have an auto-generated // Initialize simple dependencies L2Package.eINSTANCE.eClass(); in SysmlPackageImpl.java. This cuases a run-time failure against the new UML 2.5.0 support. Suggest providing dummy legacy classes such as L2Package that just extend the new StandardProfilePackage and so enable old code work.
This is a major release of UML2 which does not promise backwards compatibility. Compile errors like this are a great way of identifying things that need to be migrated to the new API.