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[eclipselink-dev] em.flush() stores data in database in a rolled back transaction

I think I've found a bug in eclipselink, but before I file it, I want to be sure it's really a bug:

1) EntityManager.persist(..)
2) EntittyManager.flush()
3) the transaction is rolled back (because an exception is thrown)
4) The data from (1) is stored in the database (as seen from the mysql command line)

As I understand flush, it should not commit the data. From

As Example 29-29 shows, you can use EntityManager method flush to send updates to the database within a transaction before the transaction is committed.

Here's the test code to reproduce the bug

public class MetaStorage implements IMetaStorage, IMetaStorageRemote {

public void createDocument() {
Document document = new Document();

// flush to force ID update

throw new StorageException();

public class StorageException extends RuntimeException {

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