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java.lang.NullPointerException: 	at org.hibernate.engine.spi.BatchFetchQueue.removeBatchLoadableEntityKey(BatchFetchQueue.java:163)	at org.hibernate.engine.internal.StatefulPersistenceContext.addEntity(StatefulPersistenceContext.java:389)	at org.hibernate.engine.internal.StatefulPersistenceContext.addEntity(StatefulPersistenceContext.java:462)	at org.hibernate.action.internal.AbstractEntityInsertAction.makeEntityManaged(AbstractEntityInsertAction.java:143)	at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:203)	at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:181)	at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:216)	at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:334)	at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:289)	at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:195)	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:126)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:114)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)	at org.grails.orm.hibernate.support.ClosureEventTriggeringInterceptor.onSaveOrUpdate(ClosureEventTriggeringInterceptor.java:105)	at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:684)	at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:676)	at org.hibernate.engine.spi.CascadingActions$5.cascade(CascadingActions.java:235)	at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350)	at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293)	at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)	at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118)	at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:470)	at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:295)	at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:195)	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:126)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:114)	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)	at org.grails.orm.hibernate.support.ClosureEventTriggeringInterceptor.onSaveOrUpdate(ClosureEventTriggeringInterceptor.java:105)	at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:684)	at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:676)	at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:671)	at org.grails.orm.hibernate.AbstractHibernateGormInstanceApi.performSave_closure3(AbstractHibernateGormInstanceApi.groovy:235)	at groovy.lang.Closure.call(Closure.java:414)	at org.grails.orm.hibernate.GrailsHibernateTemplate.doExecute(GrailsHibernateTemplate.java:196)	at org.grails.orm.hibernate.GrailsHibernateTemplate.execute(GrailsHibernateTemplate.java:140)	at org.grails.orm.hibernate.GrailsHibernateTemplate.execute(GrailsHibernateTemplate.java:110)	at org.grails.orm.hibernate.AbstractHibernateGormInstanceApi.performSave(AbstractHibernateGormInstanceApi.groovy:234)	at org.grails.orm.hibernate.AbstractHibernateGormInstanceApi.save(AbstractHibernateGormInstanceApi.groovy:154)	at org.grails.datastore.gorm.GormEntity$Trait$Helper.save(GormEntity.groovy:151)	at dependent.entity.fail.validate.UserIntegrationSpec.$tt__$spock_feature_0_0(UserIntegrationSpec.groovy:15)