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java.lang.NullPointerException: 	at com.hazelcast.hibernate.HazelcastTimestamper.nextTimestamp(HazelcastTimestamper.java:40)	at com.hazelcast.hibernate.AbstractHazelcastCacheRegionFactory.nextTimestamp(AbstractHazelcastCacheRegionFactory.java:77)	at org.hibernate.internal.SessionFactoryImpl$SessionBuilderImpl.openSession(SessionFactoryImpl.java:1322)	at org.hibernate.jpa.internal.EntityManagerImpl.internalGetSession(EntityManagerImpl.java:133)	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:174)	at org.hibernate.jpa.internal.EntityManagerImpl.(EntityManagerImpl.java:83)	at org.hibernate.jpa.internal.EntityManagerFactoryImpl.internalCreateEntityManager(EntityManagerFactoryImpl.java:319)	at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:286)