"Unique index or primary key violation" in jee_transactional_app quickstart

To reproduce:

cd ArjunaJTA/quickstarts/jee_transactional_app
export JBOSS_HOME=<PATH_TO_JBOSS_HOME>
mvn install -Parq-jbossas-managed

Observe stack traces in logs. Notice that this error doesn't cause the tests to fail.

See attached logs for what I am seeing.