Given this peristence.xml:
This should work to overwrite the jta-data-source.
But instead, it crashes in JSE and unit tests because it tries to resolve "java:jboss/datasources/ExampleDS" from JNDI. The `javax.persistence.jdbc.url` should overwrite the jta-data-source entry.
Even adding this doesn't fix it:
In Eclipse Link it's apparently possible to overwrite the persistence.xml's <jta-data-source> element: https://stackoverflow.com/a/20819336/472109
In Hibernate, that approach doesn't work: https://stackoverflow.com/questions/51514433/jpa-reuse-persistence-xml-with-jta-data-source-in-jse-and-junit-by-overriding-t