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I had the same problem: upgrade from 1.523 to 1.524, NoClassDefFoundError, Maven Integration Plugin no longer in the list of installed plugins. All of my projects (maven) and build history were also gone, with a message about changes stored on disk that could not be migrated to the current format (under 'Manage Old Data'). I re-installed the plugin (from Manage Jenkins -> Manage Plugins), and everything worked again.