Hi,
When Global Transaction is enabled and if the MDB uses CMT, then a JTA transaction is started. Resources such as datasources, JMS queue/topics etc. can participate in a JTA. But for that, the datasource has to be configured as such. DataSource should be configured as jta supported (xa) for them to participate in JTA. This is true for both
JDBC or EntityManager.
You have indicated you get this exception from one of the DataSource. Which one is that?
you should check the configuration of that DataSource.