testTransactional doesn't ever work

I'm triing testTransactional inside distribution.rehash.ConcurrentNonOverlappingLeaveTest . Often it doesn't update the c1 cache with the value "transactionally_replaced" instead of "v1".

I thought about a syncronization problem of the Threads but I see that the put of the field always is executed before the get. Actually the problem seems be in org.infinispan.distribution.rehash.RehashTestBase class (95-109):

TransactionManager t1 = TestingUtil.getTransactionManager(c1);
t1.begin();
c1.put(keys.get(0), "transactionally_replaced");
Transaction tx = t1.getTransaction();
tx.enlistResource(new XAResourceAdapter() {
public int prepare(Xid id) {
// this would be called after the cache prepares.
try

{ l.await(); }

catch (InterruptedException e) {
}
return XAResource.XA_OK;
}
});
t1.commit();

maybe sometime there is a rollback