On Wed, May 5, 2010 at 1:54 PM, Laird Nelson
<ljnelson@xxxxxxxxx> wrote:
On Wed, May 5, 2010 at 1:30 PM, Tom Ware <
tom.ware@xxxxxxxxxx> wrote:
> What are the syptoms of the failure? Is there an exception? Are
> results different? Is SQL not as expected?
or reason about which error I'm likely to see.
[snip]
(The stack for the second symptom is below.)
The second is that periodically EclipseLink will get confused and try
to instantiate the abstract root of an entity hierarchy directly when
a subclass is trying to be inserted. Specifically, I have an
AtomicNameEntity class that extends NameEntity. Both are marked as
@Entity. NameEntity, being the root of the hierarchy, defines an
@Inheritance of type SINGLE_TABLE. Sometimes EclipseLink, on being
told to persist an AtomicNameEntity object will throw an
InstantiationException trying, for some reason, to create a new
instance of NameEntity. NameEntity is abstract, as permitted by the
JPA 2.0 specification; AtomicNameEntity obviously is not.
Here are the top-level mappings:
@DiscriminatorColumn(name = "kind", length = 30)
@Entity(name = "Name")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@Table(name = "Name")
public abstract class NameEntity implements Name {
And:
@DiscriminatorValue("AtomicName")
@Entity(name = "AtomicName")
public class AtomicNameEntity extends NameEntity {
Here is the stack for the second error:
javax.persistence.PersistenceException: Exception [EclipseLink-34] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: This class does not define a public default constructor, or the constructor raised an exception.
Internal Exception: java.lang.InstantiationException
Descriptor: RelationalDescriptor(com.foobar.party.jpa.NameEntity --> [DatabaseTable(foobar.Name)])
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.flush(EntityManagerImpl.java:699)
at com.foobar.party.jpa.TestCasePartyEntity.testInsert(TestCasePartyEntity.java:108)
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 org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:62)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:165)
at org.apache.maven.surefire.Surefire.run(Surefire.java:107)
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 org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:289)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1005)
Caused by: Exception [EclipseLink-34] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: This class does not define a public default constructor, or the constructor raised an exception.
Internal Exception: java.lang.InstantiationException
Descriptor: RelationalDescriptor(com.foobar.party.jpa.NameEntity --> [DatabaseTable(foobar.Name)])
at org.eclipse.persistence.exceptions.DescriptorException.instantiationWhileConstructorInstantiation(DescriptorException.java:724)
at org.eclipse.persistence.internal.descriptors.InstantiationPolicy.buildNewInstanceUsingDefaultConstructor(InstantiationPolicy.java:139)
at org.eclipse.persistence.internal.descriptors.InstantiationPolicy.buildNewInstance(InstantiationPolicy.java:103)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildNewInstance(ObjectBuilder.java:430)
at org.eclipse.persistence.descriptors.copying.InstantiationCopyPolicy.buildClone(InstantiationCopyPolicy.java:31)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildBackupClone(ObjectBuilder.java:363)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.buildBackupClone(DeferredChangeDetectionPolicy.java:199)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.revertChanges(DeferredChangeDetectionPolicy.java:263)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.resumeUnitOfWork(UnitOfWorkImpl.java:5183)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.writeChanges(RepeatableWriteUnitOfWork.java:377)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.flush(EntityManagerImpl.java:696)
... 37 more
Caused by: java.lang.InstantiationException
at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.eclipse.persistence.internal.descriptors.InstantiationPolicy.buildNewInstanceUsingDefaultConstructor(InstantiationPolicy.java:132)
... 46 more
I hope this helps.
Best,
Laird
