There have some issues with how the retry mechanism works with Timers, and we recommend not ditching the XA driver for 2 phase commit.

We will be changing how the JMS Listener works for jBPM; currently, it used JCA Inflow Adapter, which is an element of JBoss SOA-P. We would like to instead use Message Driven Beans; this is a really stable project and an element of EJB 3.0. We believe that the issue with hung commits probably internally has something to do with JCA Inflow Adapter and its transaction management. By using MDB, we will get Container Managed Transactions, which is a stable and standard TX implementation which is well documented.