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This exception has no message.
java.lang.NullPointerException: 	at org.hibernate.search.cfg.impl.SearchConfigurationFromHibernateCore.getClassMapping(SearchConfigurationFromHibernateCore.java:77)	at org.hibernate.search.indexes.impl.IndexManagerHolder.getIndexName(IndexManagerHolder.java:278)	at org.hibernate.search.indexes.impl.IndexManagerHolder.buildEntityIndexBinding(IndexManagerHolder.java:84)	at org.hibernate.search.spi.SearchIntegratorBuilder.initDocumentBuilders(SearchIntegratorBuilder.java:358)	at org.hibernate.search.spi.SearchIntegratorBuilder.buildNewSearchFactory(SearchIntegratorBuilder.java:199)	at org.hibernate.search.spi.SearchIntegratorBuilder.buildSearchIntegrator(SearchIntegratorBuilder.java:117)	at org.hibernate.search.hcore.impl.HibernateSearchSessionFactoryObserver.sessionFactoryCreated(HibernateSearchSessionFactoryObserver.java:75)	at org.hibernate.internal.SessionFactoryObserverChain.sessionFactoryCreated(SessionFactoryObserverChain.java:35)	at org.hibernate.internal.SessionFactoryImpl.(SessionFactoryImpl.java:520)	at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:465)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:708)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724)	at org.hibernate.search.learning.HibernateSessionFactory.(HibernateSessionFactory.java:20)