JBoss.orgCommunity Documentation
eXo JCR supports the Java Transaction API out of the box. If a TransactionService has been defined (refer to the chapter about the TransactionService for more details) at session save, it checks if a global transaction is active and if so, it automatically enrolles the JCR session in the global transaction. If you intend to use a managed data source, you will have to configure the service DataSourceProvider (for more details please refer to the corresponding chapter).