I've got some trouble executing delete statements using OpenJPA 2.1.0 with 
slice and 2 MySQL 5 backends.
Here's my code:

em.getTransaction().begin();
em.createQuery("delete from A").executeUpdate();
em.createQuery("delete from B").executeUpdate();
em.createQuery("delete from C").executeUpdate();
em.getTransaction().commit();

With this, I get the "Multiple concurrent threads attempted to access a single 
broker" Exception,
Even though my application only has one thread at this point.

Out of curiosity I enabled "Openjpa.Multithreaded", yet with this, even a 
single delete statement leads to a deadlock.

Has anybody got this working or can provide some help?

regards,
Michael
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