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Chapter 21. Atom support through Apache Abdera 21.1. Abdera and Maven 21.2. Using the Abdera Provider Resteasy provides support for Apache Abdera, an implementation of the Atom protocol and data format. http://incubator.apache.org/abdera/ Abdera is a full-fledged Atom server. Resteasy only supports integration with JAX-RS for Atom data format marshalling and unmarshalling to and from the Feed and Entry interface types in Abdera. Here's a simple example: