title: MultivaluedMap exception
body: <p>I am trying to run one sample of atmosphere  but when i run the Restful web services its giving me following error , i guess because of following code its generating error , i don't know what is wrong
  i am using glassfish 3 and Netbeans IDE , here is the <a href="https://github.com/Atmosphere/atmosphere/tree/master/samples/rest-chat" rel="nofollow">sample</a> link</p>
  
  <pre><code> @Broadcast({XSSHtmlFilter.class, JsonpFilter.class})
      @Consumes("application/x-www-form-urlencoded")
      @POST
      public String publishMessage(MultivaluedMap&lt;String, String&gt; form) {
          String action = form.getFirst("action");
          String name = form.getFirst("name");
  
          if ("login".equals(action)) {
              return ("System Message" + "__" + name + " has joined.");
          } else if ("post".equals(action)) {
              return name + "__" + form.getFirst("message");
          } else {
              throw new WebApplicationException(422);
          }
      }
  
  
  
  INFO: Couldn't find JAX-B element for class java.lang.String
      SEVERE: The log message is null.
      java.lang.InstantiationException: javax.ws.rs.core.MultivaluedMap
              at java.lang.Class.newInstance0(Class.java:340)
              at java.lang.Class.newInstance(Class.java:308)
              at com.sun.jersey.server.wadl.generators.WadlGeneratorJAXBGrammarGenerator$8.resolve(WadlGeneratorJAXBGrammarGenerator.java:467)
              at com.sun.jersey.server.wadl.WadlGenerator$ExternalGrammarDefinition.resolve(WadlGenerator.java:181)
              at com.sun.jersey.server.wadl.ApplicationDescription.resolve(ApplicationDescription.java:81)
              at com.sun.jersey.server.wadl.generators.WadlGeneratorJAXBGrammarGenerator.attachTypes(WadlGeneratorJAXBGrammarGenerator.java:518)
              at com.sun.jersey.server.wadl.WadlBuilder.generate(WadlBuilder.java:124)
              at com.sun.jersey.server.impl.wadl.WadlApplicationContextImpl.getApplication(WadlApplicationContextImpl.java:104)
              at com.sun.jersey.server.impl.wadl.WadlResource.getWadl(WadlResource.java:89)
              at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
              at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
              at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
              at java.lang.reflect.Method.invoke(Method.java:597)
              at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
              at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
              at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
              at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
              at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
              at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
              at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
              at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
              at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
              at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
              at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
              at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
              at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
              at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:708)
              at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
              at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
              at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
              at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
              at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
              at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
              at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
              at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
              at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
              at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
              at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
              at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:232)
              at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
              at com.sun.grizzly.comet.CometEngine.executeServlet(CometEngine.java:444)
              at com.sun.grizzly.comet.CometEngine.handle(CometEngine.java:308)
              at com.sun.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:87)
              at com.sun.grizzly.arp.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:171)
              at com.sun.grizzly.arp.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:143)
              at com.sun.grizzly.arp.AsyncProcessorTask.doTask(AsyncProcessorTask.java:94)
              at com.sun.grizzly.http.TaskBase.run(TaskBase.java:193)
              at com.sun.grizzly.http.TaskBase.execute(TaskBase.java:175)
              at com.sun.grizzly.arp.DefaultAsyncHandler.handle(DefaultAsyncHandler.java:145)
              at com.sun.grizzly.arp.AsyncProtocolFilter.execute(AsyncProtocolFilter.java:204)
              at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
              at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
              at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
              at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
              at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
              at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
              at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
              at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
              at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
              at java.lang.Thread.run(Thread.java:619)
  
      INFO: Couldn't find JAX-B element for class javax.ws.rs.core.MultivaluedMap
      INFO: Couldn't find JAX-B element for class java.lang.String
      INFO: Couldn't find JAX-B element for class java.lang.String
      INFO: Couldn't find JAX-B element for class java.lang.String
  </code></pre>
  
  <p><strong>Run time error</strong> </p>
  
  <pre><code>SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container
  java.lang.NullPointerException
          at org.atmosphere.jersey.AtmosphereFilter$Filter.filter(AtmosphereFilter.java:177)
          at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1008)
          at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:941)
          at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:932)
          at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:384)
          at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:451)
          at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:632)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
          at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
          at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
          at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
          at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
          at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
          at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
          at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:232)
          at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
          at com.sun.grizzly.comet.CometEngine.executeServlet(CometEngine.java:444)
          at com.sun.grizzly.comet.CometEngine.handle(CometEngine.java:308)
          at com.sun.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:87)
          at com.sun.grizzly.arp.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:171)
          at com.sun.grizzly.arp.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:143)
          at com.sun.grizzly.arp.AsyncProcessorTask.doTask(AsyncProcessorTask.java:94)
          at com.sun.grizzly.http.TaskBase.run(TaskBase.java:193)
          at com.sun.grizzly.http.TaskBase.execute(TaskBase.java:175)
          at com.sun.grizzly.arp.DefaultAsyncHandler.handle(DefaultAsyncHandler.java:145)
          at com.sun.grizzly.arp.AsyncProtocolFilter.execute(AsyncProtocolFilter.java:204)
          at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
          at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
          at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
          at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
          at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
          at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
          at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
          at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
          at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
          at java.lang.Thread.run(Thread.java:619)
  </code></pre>