I am trying to save my process instance made with JBPM 3.2 on PostgresSQL but a error occurs:
| 953 [main] DEBUG org.hibernate.engine.Cascade - done processing cascade ACTION_SAVE_UPDATE for: org.jbpm.context.log.variableinstance.StringUpdateLog | 7953 [main] DEBUG org.hibernate.event.def.AbstractFlushingEventListener - dirty checking collections | 7953 [main] DEBUG org.hibernate.event.def.AbstractFlushingEventListener - Flushing entities and processing referenced collections | 7953 [main] DEBUG org.hibernate.engine.IdentifierValue - id unsaved-value: 0 | 7953 [main] ERROR org.jbpm.persistence.db.DbPersistenceService - hibernate flush failed | org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: org.jbpm.graph.def.Node | at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:219) | at org.hibernate.type.EntityType.getIdentifier(EntityType.java:397) | at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:242) | at org.hibernate.type.TypeFactory.findDirty(TypeFactory.java:597) | at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:3123) | at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:479) | at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:204) | at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:127) | at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196) | at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76) | at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26) | at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000) | at org.jbpm.persistence.db.DbPersistenceService.flushSession(DbPersistenceService.java:272) | at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:232) | at org.jbpm.svc.Services.close(Services.java:225) | at org.jbpm.JbpmContext.close(JbpmContext.java:139) | at com.br.human.jbpm.tests.ExecuteMain.main(ExecuteMain.java:54) | 7953 [main] DEBUG org.jbpm.persistence.db.DbPersistenceService - rolling back hibernate transaction | 7953 [main] ERROR org.jbpm.persistence.db.DbPersistenceService - hibernate rollback failed | java.lang.NullPointerException | at org.jbpm.persistence.db.DbPersistenceService.rollback(DbPersistenceService.java:304) | at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:234) | at org.jbpm.svc.Services.close(Services.java:225) | at org.jbpm.JbpmContext.close(JbpmContext.java:139) | at com.br.human.jbpm.tests.ExecuteMain.main(ExecuteMain.java:54) | 7953 [main] DEBUG org.jbpm.persistence.db.DbPersistenceService - closing hibernate session | 7953 [main] DEBUG org.hibernate.impl.SessionImpl - closing session | 7953 [main] DEBUG org.hibernate.jdbc.ConnectionManager - performing cleanup | 7953 [main] DEBUG org.hibernate.jdbc.ConnectionManager - releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)] | 7953 [main] DEBUG org.hibernate.connection.DriverManagerConnectionProvider - returning connection to pool, pool size: 1 | 7953 [main] DEBUG org.hibernate.jdbc.JDBCContext - after transaction completion | 7953 [main] DEBUG org.hibernate.jdbc.ConnectionManager - aggressively releasing JDBC connection | 7953 [main] DEBUG org.hibernate.impl.SessionImpl - after transaction completion | 7953 [main] ERROR org.jbpm.svc.Services - problem closing service 'persistence' | org.jbpm.persistence.JbpmPersistenceException: hibernate flush failed | at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:237) | at org.jbpm.svc.Services.close(Services.java:225) | at org.jbpm.JbpmContext.close(JbpmContext.java:139) | at com.br.human.jbpm.tests.ExecuteMain.main(ExecuteMain.java:54) | Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: org.jbpm.graph.def.Node | at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:219) | at org.hibernate.type.EntityType.getIdentifier(EntityType.java:397) | at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:242) | at org.hibernate.type.TypeFactory.findDirty(TypeFactory.java:597) | at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:3123) | at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:479) | at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:204) | at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:127) | at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196) | at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76) | at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26) | at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000) | at org.jbpm.persistence.db.DbPersistenceService.flushSession(DbPersistenceService.java:272) | at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:232) | ... 3 more | Any ideas? 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