I would like ask for an update of EAP configuration guide of chapter 14.2.3. Transactions Object Store. It should be mentioned in step number 1: Create a datasource, for example... that the TransDS datasource has to define driver as module. It can't be used with driver deployed as jar file directly in deployments directory.
See discussion at
https://issues.jboss.org/browse/WFLY-5020?focusedCommentId=13112840#comment-13112840

The text should be something like

Create a datasource, for example, TransDS. For instructions, see Create a Non-XA datasource. Be aware that the datasource has to refer to driver defined as module. If deployed directly to deployments directory and refered as simple jar file then such datasource does not work as jdbc object store backend.