9:49 a.m.
_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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