| AbstractMethodError: _persistence_shallow_clone() [message #1067596] |
Tue, 09 July 2013 09:58  |
Eclipse User |
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Hi all,
I'm trying to use single table inheritance to store 3 different classes (B,C and D) than inherit from the same base class (A). Please see the class definitions below.
Using version 2.4.2, I think I followed the instructions as described here: http://wiki.eclipse.org/EclipseLink/Examples/JPA/Inheritance#Annotations
For unit testing, this is the part of the script that fills the table:
INSERT INTO A (id, dtype, ...) VALUES
(1, 'A', ...),
(2, 'B', ...),
(3, 'C', ...),
(4, 'D', ...);
package model;
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
// @Table(name = "A")
// @DiscriminatorColumn(name = "clztype", discriminatorType = DiscriminatorType.STRING, length = 1)
// @DiscriminatorValue("A")
public class A {
@Id
@SequenceGenerator(name = "ASEQ", sequenceName = "ASEQUENCE", allocationSize = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "ASEQ")
protected Long id;
...
}
package model;
@Entity
// @DiscriminatorValue("B")
public class B extends AuthenticationBlock {
}
package model;
@Entity
// @DiscriminatorValue("C")
public class C extends A {
}
package model;
@Entity
// @DiscriminatorValue("D")
public class D extends A {
}
When loading a list, I get:
java.lang.AbstractMethodError: model.C._persistence_shallow_clone()Ljava/lang/Object;
at org.eclipse.persistence.descriptors.copying.PersistenceEntityCopyPolicy.buildClone(PersistenceEntityCopyPolicy.java:35)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildBackupClone(ObjectBuilder.java:483)
at org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy.buildBackupClone(DeferredChangeDetectionPolicy.java:225)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneFromRow(ObjectBuilder.java:1774)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:672)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:609)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:564)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:777)
at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:797)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:434)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1150)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:852)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1109)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:393)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1197)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2879)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1607)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1589)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1554)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:231)
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:411)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:247)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:333)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.data.jpa.repository.support.LockModeRepositoryPostProcessor$LockModePopulatingMethodIntercceptor.invoke(LockModeRepositoryPostProcessor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy59.findAll(Unknown Source)
Moreover, A and B seem to load fine and do not use the _persistence_shallow_clone() method at all (I set a breakpoint at line 35 of the org.eclipse.persistence.descriptors.copying.PersistenceEntityCopyPolicy.buildClone method).
It's only C and D dat give problems. Anyone got a clue?
TIA,
Ronald
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