Hey, I recognized today when executing test cases above at cmd line: infinispan/cachestore/jdbc ~> mvn -Dsurefire.useFile=false -Dtest=org/infinispan/loaders/jdbc/stringbased/JdbcStringBasedCacheStorest2 test ends up in: Caused by: java.lang.InstantiationException: org.infinispan.loaders.keymappers.TwoWayKey2StringMapper Problematic row is config.setKey2StringMapperClass(TwoWayKey2StringMapper.class.getName()); I looked around to find some magic mocking, which explains why there can be only an interface used, but I failed. Using e.g. TwoWayPersonKey2StringMapper at this point works. So why this test class does not fail in CI? --tf