The jaxrs subsystem automatically pulls in the JAXB API module for every single deployment, even if they don't have a JAX-RS component in them. This is normally not noticed since javax.xml.bind.api is already added to the deployment via javaee.api, but you want to include your own version of JAXB in your deployment, then you will need to exclude javaee.api, which is expected. But it's not expected to have to exclude the jaxrs subsystem, too.