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[CDO] Commit Exception on the second commit after thread interruption [message #1863579]

Mon, 12 February 2024 15:18

Robert Schulk

Messages: 144
Registered: July 2015

Senior Member

We are experiencing a strange behavior (CDO Version 4.23.0) in case of a thread interruption while setting model attributes. This only occurs in case that the transaction uses a CDOMergingConflictResolver.

It can be reproduced as follows:
* Open an object in a transaction
* Modify the object in a thread which is interrupted (which throws an exception, which is fine)
* Commit the transaction in the original thread => everything looks good, also the value is correct
* Modify the object again and commit it => Unexpected commit exception: "Attempt by Transaction[2:1] to modify historical revisions: (...)"

This problem was a bit difficult to track down, because the error only happens on the second commit. Is there any way to recover from this state "trying to modify a historical revision"? Committing the transaction a second time does not help. Rolling back does help, but I would like to prevent it.

It can be reproduced with the following code:

  public void testCase() throws Exception
  {
    CDOSession session = openSession();
    CDOTransaction transaction = session.openTransaction();
    transaction.options().addConflictResolver(new CDOMergingConflictResolver());

    OrderDetail orderDetail = getModel1Factory().createOrderDetail();
    orderDetail.setPrice(1);
    CDOResource resource = transaction.createResource(getResourcePath("/test1"));
    resource.getContents().add(orderDetail);

    transaction.commit();

    Thread t = new Thread(() -> {
      Thread.currentThread().interrupt();
      orderDetail.setPrice(2);
    });
    t.start();
    t.join();

    transaction.commit();
    orderDetail.setPrice(3);
    transaction.commit();
  }

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