_BackRef issue in Parent Child relation while inserting both records in one table (Recursive Relation) ------------------------------------------------------------------------------------------------------- Key: HHH-3398 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3398 Project: Hibernate3 Issue Type: Bug Environment: Hibernate 3.0 MS SQL Server Reporter: Vivek Sharma Hi, I am new to hibernate and seems to be stuck in resolving this _backref issue. I have come across many parent child relation issues in forum but nowhere , I was able to find the scenerio where parent and child records are being inserted in the same table. That, is self refering table. First, I can not attach my test case as, I am working for a Investment Banking solution and sending of code is prohibited. So, I will try to put the identical scenerio here... I have a Leg which can have numerous Legs inside it. Thats, is Leg -> Leg -> Leg Now my class Leg.java is defined as below: public class Leg implements Serializable { protected long id; protected Leg parentLeg; protected Set<Leg> legs; protected String name; <!--- further getter and setter for the same is defined --> } My hbm looks like this: <class name="Leg" table="tblLeg"> <id name="idLeg"> <generator class="native" /> </id> <!-- Mapping Set<leg> attribute of the parent entity Leg --> <set name="legs" cascade="all" lazy="false" fetch="join" inverse="true"> <key column="idParentLeg" /> <one-to-many class="Leg" /> </set> <many-to-one name="idParentLeg" class="Leg"> <column name="idParentLeg" /> </many-to-one> <property name="name"/> </class> Now, i am inserting records inside the table using the following approach: Leg parentLeg = new Leg(); parentLeg.setName("Parent Leg"); parentLeg.setParentLeg(null); Leg childLeg = new Leg(); childLeg.setName("Child Leg"); childLeg.setParentLeg(parentLeg); // i am setting back referencing here childLeg.setLegs(null); // child has no child elements Set setLeg = new HashSet(); setLeg.add(childLeg); parentLeg.setLegs(setLeg); // adding child elements to parent leg // this is how I am saving it in my test case: return (Long) getHibernateTemplate().save(entity); But when i do this, the parent leg is inserted successfully and after it throws the following stack trace: com.rbs.tradeservice.services.exception.ServiceException: com.rbs.tradeservice.services.exception.ServiceException: org.springframework.dao.DataIntegrityViolationException: not-null property references a null or transient value: com.rbs.tradeservice.jaxb.Leg._legsBackref; nested exception is org.hibernate.PropertyValueException: not-null property references a null or transient value: com.rbs.tradeservice.jaxb.Leg._legsBackref at com.rbs.tradeservice.util.LoggingAroundAdvice.invoke(LoggingAroundAdvice.java:83) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:143) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:619) at com.rbs.tradeservice.services.tradeservice.impl.TradeDomainModelServiceImpl$$EnhancerByCGLIB$$cc0b0bf6.saveTradeDetails(<generated>) at com.rbs.tradeservice.services.tradeservice.impl.TradeDomainModelServiceImplTest.testSave(TradeDomainModelServiceImplTest.java:65) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at junit.framework.TestCase.runTest(TestCase.java:154) at junit.framework.TestCase.runBare(TestCase.java:127) at junit.framework.TestResult$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:118) at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) Any help would be really appreciated... Someone suggested me to upgrade it to highre version to resolve this issue... -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira