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    copied!<p>The answer can be found in this post: <a href="http://jersey.576304.n2.nabble.com/extension-custom-negotiation-td3078866.html" rel="nofollow">http://jersey.576304.n2.nabble.com/extension-custom-negotiation-td3078866.html</a></p> <p>Essentially you configure a ResourceConfig <a href="https://jersey.dev.java.net/nonav/apidocs/1.1.0-ea/jersey/com/sun/jersey/api/core/ResourceConfig.html" rel="nofollow">https://jersey.dev.java.net/nonav/apidocs/1.1.0-ea/jersey/com/sun/jersey/api/core/ResourceConfig.html</a></p> <p>You need to extend an implementation of ResourceConfig [1] and override the media type mappings method.</p> <p>For example you can do the following:</p> <pre><code>package foo; public class MyResourceConfig extends PackagesResourceConfig { public PackagesResourceConfig(Map&lt;String, Object&gt; props) { super(props); } public Map&lt;String, MediaType&gt; getMediaTypeMappings() { Map&lt;String, MediaType&gt; m = new HashMap&lt;String, MediaType&gt; (); m.put("json", MediaType.APPLICATION_JSON_TYPE); m.put("xml", MediaType.APPLICATION_XML_TYPE); return m; } } </code></pre> <p>and you can register your "MyResourceConfig" as described here:</p> <p><a href="https://jersey.dev.java.net/documentation/1.1.0-ea/user-guide.html#d4e115" rel="nofollow">https://jersey.dev.java.net/documentation/1.1.0-ea/user-guide.html#d4e115</a></p> <p>In the above example your web.xml would need to container:</p> <pre><code>&lt;web-app&gt; &lt;servlet&gt; &lt;servlet-name&gt;Jersey Web Application&lt;/servlet-name&gt; &lt;servlet-class&gt;com.sun.jersey.spi.container.servlet.ServletContainer&lt;/servlet-class&gt; &lt;init-param&gt; &lt;param-name&gt;javax.ws.rs.Application&lt;/param-name&gt; &lt;param-value&gt;foo.MyResourceConfig&lt;/param-value&gt; &lt;/init-param&gt; &lt;init-param&gt; &lt;param-name&gt;com.sun.jersey.config.property.packages&lt;/param-name&gt; &lt;param-value&gt;org.foo.rest;org.bar.rest&lt;/param-value&gt; &lt;/init-param&gt; &lt;/servlet&gt; .... </code></pre>
 

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