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Re: [eclipselink-users] Inheritance Question
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Hi Alex,
I think there is a bug here. Please feel free to file one. I simply wanted
to assess whether you were able to proceed with the current level of support.
I recommend enabling internal weaving unless you see some problem as a result
of it. It enables several performance optimizations and it is rare that we see
problems with it.
-Tom
On 10/04/2012 2:02 AM, Alexander Mischur wrote:
Hi Tom,
thanks for the reply.
I don't need the self generated serialversion id. I faced the problem and
figured out the 2 solutions.
I'm asking because I'm interested.
Would you recommend to enable internal weaving always?
-Alex
On Mon, Apr 9, 2012 at 2:52 PM, Tom Ware <tom.ware@xxxxxxxxxx
<mailto:tom.ware@xxxxxxxxxx>> wrote:
Our internal weaving is generating a serialversionid. I suspect there is
some conflict. Is there any reason you need to be the one that generates
the serialversion id?
-Tom
On 08/04/2012 11:38 AM, Alexander Mischur wrote:
Hi all,
I’m using eclipselink 2.3.2 and jpa 2.0.3 and jdk 7u3
I have the following 3 classes:
@Entity
@Table(name = "book")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "clazz", discriminatorType =
DiscriminatorType.STRING)
public abstract class Book implements Serializable {
/**
*
*/
private static final long serialVersionUID = 6958823087646370497L;
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
@Column(name = "id")
private Long id;
@Column(name = "title")
private String title;
@Column(name = "ISBN")
private String isbn;
@Column(name = "author")
private String author;
}
@Entity(name = "PaperBook")
@DiscriminatorValue(value = "PaperBook")
public class PaperBook extends Book {
@Column(name = "pages")
private Integer pages;
}
@Entity(name = "AudioBook")
@DiscriminatorValue(value = "AudioBook")
public class AudioBook extends Book {
@Column(name = "medium")
private String medium;
@Column(name = "length_in_minutes")
private Integer lengthInMinutes;
}
My persistence.xml looks like this:
<persistence xmlns="http://java.sun.com/__xml/ns/persistence
<http://java.sun.com/xml/ns/persistence>"
xmlns:xsi="http://www.w3.org/__2001/XMLSchema-instance
<http://www.w3.org/2001/XMLSchema-instance>"
xsi:schemaLocation="http://__java.sun.com/xml/ns/__persistence
<http://java.sun.com/xml/ns/persistence>
http://java.sun.com/xml/ns/__persistence/persistence_2_0.__xsd
<http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd>">
<persistence-unit name="libraryPU" transaction-type="RESOURCE___LOCAL">
<provider>org.eclipse.__persistence.jpa.__PersistenceProvider</provider>
<class>de.mischur.library.__entities.Book</class>
<class>de.mischur.library.__entities.PaperBook</class>
<class>de.mischur.library.__entities.AudioBook</class>
</persistence-unit>
</persistence>
When I generate a serialVersionUID for one of the 3 classes and then
execute a
select via persistenceManager I get this exception:
java.lang.AbstractMethodError:
de.mischur.library.entities.__PaperBook._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:480)
at
org.eclipse.persistence.__descriptors.changetracking.__DeferredChangeDetectionPolicy.__buildBackupClone(__DeferredChangeDetectionPolicy.__java:218)
at
org.eclipse.persistence.__internal.descriptors.__ObjectBuilder.__buildWorkingCopyCloneFromRow(__ObjectBuilder.java:1699)
at
org.eclipse.persistence.__internal.descriptors.__ObjectBuilder.__buildObjectInUnitOfWork(__ObjectBuilder.java:664)
at
org.eclipse.persistence.__internal.descriptors.__ObjectBuilder.buildObject(__ObjectBuilder.java:601)
at
org.eclipse.persistence.__internal.descriptors.__ObjectBuilder.buildObject(__ObjectBuilder.java:560)
at
org.eclipse.persistence.__queries.ObjectLevelReadQuery.__buildObject(__ObjectLevelReadQuery.java:717)
at
org.eclipse.persistence.__queries.ReadAllQuery.__registerResultInUnitOfWork(__ReadAllQuery.java:769)
at
org.eclipse.persistence.__queries.ReadAllQuery.__executeObjectLevelReadQuery(__ReadAllQuery.java:433)
at
org.eclipse.persistence.__queries.ObjectLevelReadQuery.__executeDatabaseQuery(__ObjectLevelReadQuery.java:__1081)
at
org.eclipse.persistence.__queries.DatabaseQuery.execute(__DatabaseQuery.java:844)
at
org.eclipse.persistence.__queries.ObjectLevelReadQuery.__execute(ObjectLevelReadQuery.__java:1040)
at
org.eclipse.persistence.__queries.ReadAllQuery.execute(__ReadAllQuery.java:392)
at
org.eclipse.persistence.__queries.ObjectLevelReadQuery.__executeInUnitOfWork(__ObjectLevelReadQuery.java:__1128)
at
org.eclipse.persistence.__internal.sessions.__UnitOfWorkImpl.__internalExecuteQuery(__UnitOfWorkImpl.java:2871)
at
org.eclipse.persistence.__internal.sessions.__AbstractSession.executeQuery(__AbstractSession.java:1516)
at
org.eclipse.persistence.__internal.sessions.__AbstractSession.executeQuery(__AbstractSession.java:1498)
at
org.eclipse.persistence.__internal.sessions.__AbstractSession.executeQuery(__AbstractSession.java:1463)
at
org.eclipse.persistence.__internal.jpa.EJBQueryImpl.__executeReadQuery(EJBQueryImpl.__java:485)
at
org.eclipse.persistence.__internal.jpa.EJBQueryImpl.__getResultList(EJBQueryImpl.__java:742)
at
de.mischur.library.dao.impl.__GenericDaoImpl.findAll(__GenericDaoImpl.java:54)
at de.mischur.library.dao.__BookDaoTest.testFindAll(__BookDaoTest.java:37)
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.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.springframework.test.__context.junit4.statements.__RunBeforeTestMethodCallbacks.__evaluate(__RunBeforeTestMethodCallbacks.__java:74)
at
org.springframework.test.__context.junit4.statements.__RunAfterTestMethodCallbacks.__evaluate(__RunAfterTestMethodCallbacks.__java:83)
at
org.springframework.test.__context.junit4.statements.__SpringRepeat.evaluate(__SpringRepeat.java:72)
at
org.springframework.test.__context.junit4.__SpringJUnit4ClassRunner.__runChild(__SpringJUnit4ClassRunner.java:__231)
at
org.junit.runners.__BlockJUnit4ClassRunner.__runChild(__BlockJUnit4ClassRunner.java:__49)
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.springframework.test.__context.junit4.statements.__RunBeforeTestClassCallbacks.__evaluate(__RunBeforeTestClassCallbacks.__java:61)
at
org.springframework.test.__context.junit4.statements.__RunAfterTestClassCallbacks.__evaluate(__RunAfterTestClassCallbacks.__java:71)
at org.junit.runners.__ParentRunner.run(ParentRunner.__java:236)
at
org.springframework.test.__context.junit4.__SpringJUnit4ClassRunner.run(__SpringJUnit4ClassRunner.java:__174)
at
org.eclipse.jdt.internal.__junit4.runner.__JUnit4TestReference.run(__JUnit4TestReference.java:50)
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)
When I remove the serialVersionUID or disable internal-weaving
[eclipselink.weaving.internal=__false] then everything works fine.
Can someone please explain what is going on in the background of
eclipselink?
And why is everything working when internal-weaving at runtime is disabled?
Thank you in advance
Regards
Alex
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