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POHow to send a HashMap object via Jersey webservice framework?
 

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    <p>I have a simple hashmap calss that I want to send as JSON via Jersey. Does anyone have an example on how to perform such an operation , I have tried the following </p> <pre><code>package de.vogella.jersey.first; import java.util.HashMap; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.Produces; import javax.ws.rs.core.MediaType; import com.sun.jersey.api.view.Viewable; // This method is called if XML is request @GET @Produces({ MediaType.APPLICATION_XML,MediaType.APPLICATION_JSON }) public HashMap sayXMLHello() { HashMap map = new HashMap(); map.put( new Integer( 2 ), "two" ); map.put( new Integer( 4 ), "four" ); return map; } // This method is called if HTML is request @GET @Produces(MediaType.TEXT_HTML) public String sayHtmlHello() { return "&lt;html&gt; " + "&lt;title&gt;" + "Hello Jersey" + "&lt;/title&gt;" + "&lt;body&gt;&lt;h1&gt;" + "Hello Jersey" + "&lt;/body&gt;&lt;/h1&gt;" + "&lt;/html&gt; "; } } </code></pre> <p>and then the client </p> <pre><code>package de.vogella.jersey.first; import java.net.URI; import java.util.HashMap; import javax.ws.rs.core.MediaType; import javax.ws.rs.core.UriBuilder; import com.sun.jersey.api.client.Client; import com.sun.jersey.api.client.ClientResponse; import com.sun.jersey.api.client.WebResource; import com.sun.jersey.api.client.config.ClientConfig; import com.sun.jersey.api.client.config.DefaultClientConfig; public class Test { public static void main(String[] args) { ClientConfig config = new DefaultClientConfig(); Client client = Client.create(config); WebResource service = client.resource(getBaseURI()); // Calls the HashMap function System.out.println( service.path("rest") .path("hello") .accept(MediaType.APPLICATION_JSON) .get(HashMap.class)); // The HTML System.out.println(service.path("rest") .path("hello") .accept(MediaType.TEXT_HTML) .get(String.class)); } private static URI getBaseURI() { return UriBuilder.fromUri("http://localhost:8080/de.vogella.jersey.first").build(); } } </code></pre> <p>once I deploy and call the client class , I get the following error :</p> <pre><code>Exception in thread "main" com.sun.jersey.api.client.UniformInterfaceException: GET http://localhost:8080/de.vogella.jersey.first/rest/hello returned a response status of 500 Internal Server Error at com.sun.jersey.api.client.WebResource.handle(WebResource.java:686) at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:507) at de.vogella.jersey.first.Test.main(Test.java:25) </code></pre> <p>so any ideas on how can I send a HashMap object from a server to the client using Jersey? also I can't map the HashMap object to a POJO for not having a uniform structure (changes all the time) <p> thanks.</p>
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