When adding dynamically a transactional annotation, transactional module isn't loaded, so transactions aren't available and throws this error:

javax.persistence.TransactionRequiredException: WFLYJPA0060: Transaction is required to perform this operation (either use a transaction or extended persistence context)

I've attached a reproducer with a test in order to reproduce this. There you can see that there is a CDI producer that dynamically adds the annotation for transactions, that doesn't work.

mkouba@redhat.com found this could be an optimization for not loading JTS module: https://github.com/wildfly/wildfly/blob/master/transactions/src/main/java/org/jboss/as/txn/deployment/TransactionDependenciesProcessor.java#L74-L76

In order to execute tests:

mvn clean test

To execute test, passing in Payara:

mvn clean test -Ppayara