17.7.2. Possible Problems with Jettison Provider

If you have the resteasy-jackson-provider-xxx.jar in your classpath, the Jackson JSON provider will be triggered. This is problematic for code that depends upon the Jettison JAXB or JSON provider. To correct this, you must either remove Jackson from your WEB-INF/lib or classpath, or use the @NoJackson annotation on your JAXB classes.