我正在neo4j中创建一个主要节点并创建它与School的关系，它在neo4j中成功地创建了主要对象和关系。
SchoolHasPrincipal school_has_principle = new SchoolHasPrincipal(school, principal);
principal.setHasPrincipalRelationship(school_has_principle);
Principal newPrincipal = principalDao.create(principal);
System.out.println("principal created>>"+newPrincipal.getId());
SchoolHasPrincipal shp = schoolHasPrincipalDao.create(school_has_principle);
System.out.println("relationship created>>"+shp.getId());
但有时候工作之后，突然间会出错
执行异常[[CypherTransactionExecutionException：错误 执行cypher语句 [{代码= Neo.DatabaseError.Statement.ExecutionFailure， message =关系2375已被删除， stackTrace = java.lang.IllegalStateException：关系2375已经 删除\ n \达 org.neo4j.kernel.impl.api.StateHandlingStatementOperations.relationshipGetAllProperties（StateHandlingStatementOperations.java:824）\ n \达 org.neo4j.kernel.impl.api.ConstraintEnforcingEntityOperations.relationshipGetAllProperties（ConstraintEnforcingEntityOperations.java:339）\ n \达 org.neo4j.kernel.impl.api.OperationsFacade.relationshipGetAllProperties（OperationsFacade.java:262）\ n \达 org.neo4j.kernel.impl.core.RelationshipProxy.getPropertyKeys（RelationshipProxy.java:156）\ n \达 org.neo4j.server.rest.transactional.Neo4jJsonCodec.writePropertyContainer（Neo4jJsonCodec.java:120）\ n \达 org.neo4j.server.rest.transactional.Neo4jJsonCodec.writeValue（Neo4jJsonCodec.java:41）\ n \达 org.codehaus.jackson.impl.JsonGeneratorBase.writeObject（JsonGeneratorBase.java:314）\ n \达 org.neo4j.server.rest.transactional.RowWriter.write（RowWriter.java:37）\ n \达 org.neo4j.server.rest.transactional.AggregatingWriter.write（AggregatingWriter.java:41）\ n \达 org.neo4j.server.rest.transactional.ExecutionResultSerializer.writeRows（ExecutionResultSerializer.java:298）\ n \达 org.neo4j.server.rest.transactional.ExecutionResultSerializer.statementResult（ExecutionResultSerializer.java:104）\ n \达 org.neo4j.server.rest.transactional.TransactionHandle.executeStatements（TransactionHandle.java:278）\ n \达 org.neo4j.server.rest.transactional.TransactionHandle.execute（TransactionHandle.java:207）\ n \达 org.neo4j.server.rest.transactional.TransactionHandle.execute（TransactionHandle.java:90）\ n \达 org.neo4j.server.rest.web.TransactionalService $ 1.write（TransactionalService.java:180）\ n \达 com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo（StreamingOutputProvider.java:71）\ n \达 com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo（StreamingOutputProvider.java:57）\ n \达 com.sun.jersey.spi.container.ContainerResponse.write（ContainerResponse.java:306）\ n \达 com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest（WebApplicationImpl.java:1437）\ n \达 com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest（WebApplicationImpl.java:1349）\ n \达 com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest（WebApplicationImpl.java:1339）\ n \达 com.sun.jersey.spi.container.servlet.WebComponent.service（WebComponent.java:416）\ n \达 com.sun.jersey.spi.container.servlet.ServletContainer.service（ServletContainer.java:537）\ n \达 com.sun.jersey.spi.container.servlet.ServletContainer.service（ServletContainer.java:699）\ n \达 javax.servlet.http.HttpServlet.service（HttpServlet.java:848）\ n \达 org.eclipse.jetty.servlet.ServletHolder.handle（ServletHolder.java:698）\ n \达 org.eclipse.jetty.servlet.ServletHandler.doHandle（ServletHandler.java:505）\ n \达 org.eclipse.jetty.server.session.SessionHandler.doHandle（SessionHandler.java:211）\ n \达 org.eclipse.jetty.server.handler.ContextHandler.doHandle（ContextHandler.java:1096）\ n \达 org.eclipse.jetty.servlet.ServletHandler.doScope（ServletHandler.java:432）\ n \达 org.eclipse.jetty.server.session.SessionHandler.doScope（SessionHandler.java:175）\ n \达 org.eclipse.jetty.server.handler.ContextHandler.doScope（ContextHandler.java:1030）\ n \达 org.eclipse.jetty.server.handler.ScopedHandler.handle（ScopedHandler.java:136）\ n \达 org.eclipse.jetty.server.handler.HandlerList.handle（HandlerList.java:52）\ n \达 org.eclipse.jetty.server.handler.HandlerWrapper.handle（HandlerWrapper.java:97）\ n \达 org.eclipse.jetty.server.Server.handle（Server.java:445）\ n \达 org.eclipse.jetty.server.HttpChannel.handle（HttpChannel.java:268）\ n \达 org.eclipse.jetty.server.HttpConnection.onFillable（HttpConnection.java:229）\ n \达 org.eclipse.jetty.io.AbstractConnection $ ReadCallback.run（AbstractConnection.java:358）\ n \达 org.eclipse.jetty.util.thread.QueuedThreadPool.runJob（QueuedThreadPool.java:601）\ n \达 org.eclipse.jetty.util.thread.QueuedThreadPool $ 3.run（QueuedThreadPool.java:532）\ n \达 java.lang.Thread.run（Thread.java:745）\ N}]]]
告诉我你是否还想要我的代码