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https://issues.apache.org/jira/browse/OPENJPA-2262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457391#comment-13457391
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Rick Curtis commented on OPENJPA-2262:
--------------------------------------
Hmm, ok. Could I have you post a simple unit test that recreates the issue?
> Merging Deserialized Objects Reports Duplicate IDs
> --------------------------------------------------
>
> Key: OPENJPA-2262
> URL: https://issues.apache.org/jira/browse/OPENJPA-2262
> Project: OpenJPA
> Issue Type: Bug
> Components: kernel
> Affects Versions: 2.2.0
> Environment: Java 1.6, Postgres
> Reporter: Roger Keays
> Attachments: BaseEntity.java, Blob.java
>
>
> OPENJPA-792 patched a defect where putting @Id in the superclass caused
> primary key conflicts in the subclasses.
>
> https://issues.apache.org/jira/browse/OPENJPA-792
> I get the same error described in OPENJPA-792 when merging a deserialized
> instance of an object from my domain model. I can reproduce the problem with
> some objects in my domain model but not others (although the all have the
> same superclass which contains the @Id field).
> This only occurs after deserialization and closing and opening the
> EntityManager.
> My failing unit test looks like this.
> public void canMergeEntitiesWithMatchingIDAfterSerialization() throws
> IOException, ClassNotFoundException {
>
> // setup id sequences
> Long id = System.currentTimeMillis();
> EntityManager em = DB.getPersistenceContext();
> em.getTransaction().begin();
> em.createNativeQuery(
> "SELECT setval('cms_content_id_seq', " + id + ");")
> .getResultList();
> em.createNativeQuery(
> "SELECT setval('web_blobs_id_seq', " + id + ");")
> .getResultList();
>
> // persist with same id
> Server server = newServer();
> Content c = ContentTest.createValid(server);
> Blob b = BlobTest.createValid(server);
> em.persist(c);
> em.persist(b);
> em.getTransaction().commit();
> assertNotNull(c.getId());
> assertNotNull(b.getId());
> assertEquals(c.getId(), b.getId());
>
> // serialize and deserialize the object
> File file = File.createTempFile("blob", "bin");
> ObjectOutput out = new ObjectOutputStream(new
> FileOutputStream(file));
> out.writeObject(b);
> out.close();
> ObjectInputStream in = new ObjectInputStream(new
> FileInputStream(file));
> b = (Blob) in.readObject();
> in.close();
>
> // reopen db session and try to merge an update
> em.close();
> em = DB.getPersistenceContext();
> em.merge(b); // EntityNotFoundException
> }
> And the stacktrace is
> <openjpa-2.2.0-r422266:1244990 nonfatal store error>
> org.apache.openjpa.persistence.EntityNotFoundException: Attempted to attach
> instance "1347912956793" of type "class ox.webcore.blobs.Blob", but this
> instance is already in the datastore as type "class ox.cms.content.Content".
> FailedObject: ox.webcore.blobs.Blob@162e703
> at
> org.apache.openjpa.kernel.VersionAttachStrategy.attach(VersionAttachStrategy.java:118)
> at
> org.apache.openjpa.kernel.AttachManager.attach(AttachManager.java:252)
> at
> org.apache.openjpa.kernel.AttachManager.attach(AttachManager.java:105)
> at org.apache.openjpa.kernel.BrokerImpl.attach(BrokerImpl.java:3474)
> at
> org.apache.openjpa.kernel.DelegatingBroker.attach(DelegatingBroker.java:1214)
> at
> org.apache.openjpa.persistence.EntityManagerImpl.merge(EntityManagerImpl.java:878)
> at
> ox.webcore.util.DB$DBTest.canMergeEntitiesWithMatchingIDAfterSerialization(DB.java:145)
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