ViolationReport is not processed by JAXB provider in AS 7 and WF 8

@XmlRootElement is not on the classpath, so the JAXB providers don't recognize it.

The problem was discovered here: http://www.javacodegeeks.com/2014/04/validating-jax-rs-resource-data-with-bean-validation-in-java-ee-7-and-wildfly.html