broker = createBroker(true);
setDefaultPersistenceAdapter(broker);
broker.setPlugins(new BrokerPlugin[]{
new BrokerPluginSupport() {
@Override
public void commitTransaction(ConnectionContext context,
TransactionId xid, boolean onePhase) throws Exception {
super.commitTransaction(context, xid, onePhase);
// so commit will hang as if reply is lost