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Re: [eclipselink-users] Primary key foreign key entity relationship issue
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Hello,
The exception is occurring because the object model is not complete.
The specification requires that composite primary keys use an IdClass or
an EmbeddedId so that there is a key class containing all fields. By
removing the EmbeddedId, you have removed your pk class - you will need
to specify the @IdClass to use instead.
Also, using derrivedIds means that the child class must incorporate its
parent id into its own Id. That means if A has a composite PK, B's ID
must also include that composite pk class as well as any additional
fields it uses. I cannot determine which class in your tree is involved
in the problem, but a simple example would be
@Entity
class A {
@Id
@Column(name="A_ID")
@GeneratedValue(strategy = GenerationType.AUTO)
private String aId;
}
@Entity
@IDClass(BID.class)
class B {
@Column(name="B_ID")
@Id
private int bId;
@Id
@ManyToOne(cascade = ALL)
@JoinColumn(name="A_ID", referencedColumnName="A_ID")
@XmlTransient
private A a;
}
class BID{
int bId; //same type and name as the id from B
String a;//must be the same type as A's id, and the attribute must use the name of the relationship from B
}
If A has a composite pk and uses an embeddable or pk class, B would look the same (except for additional join columns of course) but BID might look like:
class BID{
int bId;
AID a; //the type is the same as A's idclass/embeddedid class.
}
The specification has some examples at:
http://jcp.org/en/jsr/detail?id=317
Best Regards,
Chris
luke2010 wrote:
I am using EclipseLink 2.0.1. the error i mentioned is shown up in eclipse
IDE, if I ignore this error, and continue running my testcase, it will throw
error like below:
==========================
junit.framework.AssertionFailedError: Exception in constructor: test1 (Local
Exception Stack:
Exception [EclipseLink-30005] (Eclipse Persistence Services -
2.0.1.v20100213-r6600):
org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for
persistence archives with ClassLoader:
sun.misc.Launcher$AppClassLoader@1aa6b1
Internal Exception: javax.persistence.PersistenceException: Exception
[EclipseLink-28018] (Eclipse Persistence Services - 2.0.1.v20100213-r6600):
org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [brancoch] failed.
Internal Exception: java.lang.ClassCastException:
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.IdAccessor
at
org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:126)
at
org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:133)
at
org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:65)
at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60)
at
ca.gc.rcmp.rtid.entities.test.TestAfisSubject.<init>(TestAfisSubject.java:31)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at junit.framework.TestSuite.createTest(TestSuite.java:61)
at junit.framework.TestSuite.addTestMethod(TestSuite.java:283)
at junit.framework.TestSuite.<init>(TestSuite.java:146)
at
org.junit.internal.runners.JUnit38ClassRunner.<init>(JUnit38ClassRunner.java:67)
at
org.junit.internal.builders.JUnit3Builder.runnerForClass(JUnit3Builder.java:14)
at
org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at
org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
at
org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:29)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:40)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:30)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: javax.persistence.PersistenceException: Exception
[EclipseLink-28018] (Eclipse Persistence Services - 2.0.1.v20100213-r6600):
org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [brancoch] failed.
Internal Exception: java.lang.ClassCastException:
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.IdAccessor
at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:991)
at
org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:88)
at
org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:124)
... 25 more
Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services -
2.0.1.v20100213-r6600):
org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [brancoch] failed.
Internal Exception: java.lang.ClassCastException:
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.IdAccessor
at
org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210)
... 28 more
Caused by: java.lang.ClassCastException:
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.IdAccessor
at
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.ObjectAccessor.processId(ObjectAccessor.java:369)
at
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.ObjectAccessor.processOwningMappingKeys(ObjectAccessor.java:595)
at
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.OneToOneAccessor.process(OneToOneAccessor.java:158)
at
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.RelationshipAccessor.processRelationship(RelationshipAccessor.java:546)
at
org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.processDerivedId(ClassAccessor.java:969)
at
org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processDerivedId(EntityAccessor.java:804)
at
org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processAccessorsWithDerivedIDs(MetadataProject.java:1009)
at
org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage3(MetadataProject.java:1352)
at
org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:462)
at
org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:390)
at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:945)
... 27 more
)
at junit.framework.Assert.fail(Assert.java:47)
at junit.framework.TestSuite$1.runTest(TestSuite.java:97)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:79)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
===========================================
The error I mentioned is
christopher delahunt wrote:
What version are you using? Can you provide the error and the stack
trace?
Regards,
Chris
luke2010 wrote:
In my case under eclipseLink 2.0, there are A, B and C entity class. A
has
1:M relationship to B, B has 1:1 relationship to C. A has PK aId, B has
PK
aId, bId, C has PK aId and bId, aId is part of PK of B and C, and also FK
to
A.
@Entity
class A {
@Id
@Column(name="A_ID")
@GeneratedValue(strategy = GenerationType.AUTO)
private String aId;
@OneToMany( mappedBy="a", cascade = ALL, targetEntity=B.class)
@PrivateOwned
private Set bs;
}
1. why mappedBy="a" is always complaining that Attribute named "a" has
invalid mapping for this relationship. If I removed the @Id in class B
for
@ManyToOne, this complain will disappear.
@Entity
class B {
@Column(name="B_ID")
@Id
private int bId;
@ManyToOne(cascade = ALL)
@JoinColumn(name="A_ID", referencedColumnName="A_ID")
@Id
@XmlTransient
private A a;
@OneToOne(optional=false, mappedBy="b", cascade = ALL, targetEntity =
C.class)
@PrivateOwned
private C c;
}
1. why mappedBy="b" is always complaining that Attribute named "b" has
invalid mapping for this relationship. If I removed the @Id in class C
for
@ManyToOne, this complain will disappear. But it will compain other thing
"Entity "C" has no Id or EmbeddedId"
@Entity
Class C{
@OneToOne(optional = false)
@JoinColumns({
@JoinColumn(name="A_ID", referencedColumnName="A_ID", insertable =
false,
updatable = false),
@JoinColumn(name="B_ID", referencedColumnName="B_ID", insertable =
false,
updatable = false),
})
@XmlTransient
@Id
private B b;
}
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