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    <blockquote> <p>Detailed Reply includes <strong>Server</strong> and <strong>Client</strong> sample implementation with <strong>JSON Marshalling and Unmarshalling</strong></p> </blockquote> <p><strong>Note:</strong> Json POJO Mapping features is done using Jackson</p> <p>I spent a whole day in finidng why message body write was not found. What I was doing wrong is I was using <code>JAXB javax.xml.bind.annotation @XMLRootElement</code> in my Jersey 1.17.1 Web Service and I was trying to unmarshall it with Jackson.</p> <p>Acutally if you Google it you will find that <code>JAXB</code> is only good for XML but for JSON Jackson is excellent. I also forgot to put some configuration paramters in my <code>web.xml</code> that enable POJO Mapping feature.</p> <p>Here is the snap of how you your servlet mapping should be to enable POJO mapping feature of Jackson.</p> <pre><code>&lt;!-- WebService --&gt; &lt;servlet&gt; &lt;servlet-name&gt;REST Service&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;com.sun.jersey.spi.container.ContainerRequestFilters&lt;/param-name&gt; &lt;param-value&gt;com.sun.jersey.api.container.filter.LoggingFilter;com.algo.server.webservice.WebServiceRequestFilter&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;com.algo.server.webservice;org.codehaus.jackson.jaxrs&lt;/param-value&gt; &lt;/init-param&gt; &lt;init-param&gt; &lt;param-name&gt;com.sun.jersey.api.json.POJOMappingFeature&lt;/param-name&gt; &lt;param-value&gt;true&lt;/param-value&gt; &lt;/init-param&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;REST Service&lt;/servlet-name&gt; &lt;url-pattern&gt;/rest/*&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; </code></pre> <p>You also need to add those jar files into your WEB-INF/libs folder</p> <ul> <li>jackson-core-asl-1.9.2.jar</li> <li>jackson-mapper-asl-1.9.2.jar</li> <li>jackson-xc-1.9.2.jar</li> <li>jackson-jaxrs-1.9.2.jar</li> </ul> <p>This is a sample web service method that returns a list of some objects</p> <pre><code> @GET @Produces({ MediaType.APPLICATION_JSON }) @Path("/clientId/{client_id}/clientDept/{client_department}/clientLoc/{client_location}") public Response getTasksForClientId(@PathParam("client_id") String pClientId, @PathParam("client_department") String pClientDepartment, @PathParam("client_location") String pClientLocation) { List&lt;Task&gt; list = new ArrayList&lt;Task&gt;(10); Task task = null; for (int i = 0; i &lt; 10; i++) { task = new Task(); task.setComments("These are test comments"); task.setCreatedBy(11L); task.setCreatedOn(new Date()); task.setFromDay(new Date()); task.setFromTime(new Date()); task.setToTime(new Date()); task.setToDay(new Date()); task.setUpdatedOn(new Date()); task.setLocation("Pakistan Punajb"); task.setSpecialCoverImage("webserver\\cover\\cover001.png"); task.setTargetId(1L); task.setTargetPlaceHolder(2); task.setUpdatedBy(23234L); list.add(task); } GenericEntity&lt;List&lt;Task&gt;&gt; entity = new GenericEntity&lt;List&lt;Task&gt;&gt;(list) { }; return Response.ok(entity).build(); } </code></pre> <blockquote> <p>Client Side</p> </blockquote> <p>Now How to use convert this JSON object on client side into same <code>List&lt;T&gt;</code> Object. It's a sinch :-)</p> <p><strong>You need to put the same class from the server that you converted into POJO. It shoulb be the same</strong></p> <pre><code>private void checkForUpdate() { ClientConfig clientConfig = new DefaultClientConfig(); clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE); clientConfig.getClasses().add(JacksonJsonProvider.class); Client client = Client.create(clientConfig); WebResource webResource = client.resource("http://localhost:8080/some-server"); WebResource wr = webResource.path("rest").path("taskPublisherService").path("clientId/12").path("clientDept/2").path("clientLoc/USA"); ClientResponse clientResponse = wr.type(MediaType.APPLICATION_JSON).get(ClientResponse.class); List&lt;Task&gt; lists = clientResponse.getEntity(new GenericType&lt;List&lt;Task&gt;&gt;() {}); System.out.println(lists); } </code></pre>
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