title: How to create a JSON output inJAVA
body: <p>I try to create a JSON output in Java.<br>
  ==================This is the code for the Object with the Elements: ======================</p>
  
  <pre><code>import javax.xml.bind.annotation.XmlRootElement;
  
  @XmlRootElement
  public class LoginMobileProperties {
  
      private String username;
      private boolean status;
      private String message;
  
      public LoginMobileProperties(){
  
      }
  
      public String getUsername() {
          return username;
      }
      public void setUsername(String username) {
          this.username = username;
      }
      public boolean getStatus() {
          return status;
      }
      public void setStatus(boolean status) {
          this.status = status;
      }
      public String getMessage() {
          return message;
      }
      public void setMessage(String message) {
          this.message = message;
      }
  
  
  }
  </code></pre>
  
  <p>=================This is the class with the get function for the url call:=======================</p>
  
  <pre><code>    @GET
      @Path("login")
      @Produces("application/json")
      public LoginMobileProperties setLogin(
              @QueryParam("name") String name,
              @QueryParam("password") String password) {
  
  
  
          servlerResponse.addHeader("Allow-Control-Allow-Methods", "POST,GET,OPTIONS"); 
          servlerResponse.addHeader("Access-Control-Allow-Credentials", "true"); 
          servlerResponse.addHeader("Access-Control-Allow-Origin", "*"); 
          servlerResponse.addHeader("Access-Control-Allow-Headers", "Content-Type,X-Requested-With"); 
          servlerResponse.addHeader("Access-Control-Max-Age", "60"); 
  
  
          LoginMobileProperties loginMobileProperties = new LoginMobileProperties();
  
          loginMobileProperties.setUsername(name);
          loginMobileProperties.setStatus("true");
          loginMobileProperties.setMessage("test3");
  
  
  
  
  
               return loginMobileProperties;
  
  
      }
  </code></pre>
  
  <p>=================This is the full error code when i open the url : ============================</p>
  
  <pre><code>Okt 29, 2012 11:32:02 AM com.sun.jersey.spi.container.ContainerResponse write
  SEVERE: A message body writer for Java class LoginMobileProperties, and Java type class LoginMobileProperties, and MIME media type application/json was not found
  Okt 29, 2012 11:32:02 AM com.sun.jersey.spi.container.ContainerResponse write
  SEVERE: The registered message body writers compatible with the MIME media type are:
  application/json -&gt;
    com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$App
    com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$App
    com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$App
    com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$App
    com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$App
  */* -&gt;
    com.sun.jersey.core.impl.provider.entity.FormProvider
    com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General
    com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$General
    com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$General
    com.sun.jersey.json.impl.provider.entity.JSONWithPaddingProvider
    com.sun.jersey.core.impl.provider.entity.StringProvider
    com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
    com.sun.jersey.core.impl.provider.entity.FileProvider
    com.sun.jersey.core.impl.provider.entity.InputStreamProvider
    com.sun.jersey.core.impl.provider.entity.DataSourceProvider
    com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
    com.sun.jersey.core.impl.provider.entity.ReaderProvider
    com.sun.jersey.core.impl.provider.entity.DocumentProvider
    com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider
    com.sun.jersey.core.impl.provider.entity.SourceProvider$SourceWriter
    com.sun.jersey.server.impl.template.ViewableMessageBodyWriter
    com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General
    com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General
    com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy
    com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
    com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
  
  Okt 29, 2012 11:32:02 AM com.sun.jersey.spi.container.ContainerResponse logException
  SEVERE: Mapped exception to response: 500 (Internal Server Error)
  javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class LoginMobileProperties, and Java type class LoginMobileProperties, and MIME media type application/json was not found
      at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:285)
      at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1437)
      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:820)
      at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
      at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:126)
      at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:76)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
      at org.eclipse.equinox.http.jetty.internal.HttpServerManager$InternalHttpServiceServlet.service(HttpServerManager.java:317)
      at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
      at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at org.mortbay.jetty.Server.handle(Server.java:326)
      at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
      at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:924)
      at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
      at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
      at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
      at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
      at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
  Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class LoginMobileProperties, and Java type class LoginMobileProperties, and MIME media type application/json was not found
      ... 26 more
  </code></pre>
  
  <p>What is my mistake?</p>