[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3398) _BackRef issue in Parent Child relation while inserting both records in one table (Recursive Relation)

[Vivek Sharma (JIRA)]

_BackRef issue in Parent Child relation while inserting both records in one table (Recursive Relation) 
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                 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...

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