We used to work with UnconstrainedEntityMetaDataSingleton in case a BeanMetaData was needed for a type that has no constraints at all. It seems this isn't used any more as of HV-1277: there used to be a call to BeanMetaDataManager#getOrCreateBeanMetaData() with allowUnconstrainedTypeSingleton=true, but that's not true any longer, meaning the singleton will never be used. So we should either remove that class or make sure that the change in HV-1277 Closed was the right thing indeed and if not, revert it so the singleton gets used again.