Include the Abdera provider
21.1. Abdera and Maven The Abdera provider is not included with the Resteasy distribution. To include the Abdera provider in your WAR poms, include the following. Please change the version to be the version of resteasy you are working with. Also, Resteasy may be coded to pick up an older version of Abdera than what you want. You're on your own with fixing this one, sorry. jboss http://repository.jboss.org/maven2 ... org.jboss.resteasy abdera-atom-provider ...version...