Jersey RESTful Service, Error 500

StackOverflow https://stackoverflow.com/questions/19686602

Question

I am new to Restful web services. I want to access the Server via a Jersey Client. But I am getting a 500 error. What i am trying to do is submit an table name through the client end and retrieve the table contents as a JSON. Can anyone please find the error here?

This is my client end

 public JSONObject loadTable(String tablename) throws ClientProtocolException, IOException {
    pathParams.add("tablename", tablename);
    JSONObject jsontable = service.path("access").path("loadtable").queryParams(pathParams).get(JSONObject.class);
    return jsontable;
}

This is my Server end

@Path("/loadtable")
@GET
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.TEXT_PLAIN)
public JSONObject loadTable(@QueryParam("tablename") String tablename) throws Exception {
    List<Pricing> pricing = new ArrayList<Pricing>();
    try {
        query = c.prepareStatement("select * from '" + tablename + "'");
        ResultSet ets_rs = query.executeQuery();

        while (ets_rs.next()) {
            pricing.add(new Pricing(ets_rs.getString(1), ets_rs.getString(2),  ets_rs.getString(3), ets_rs.getString(4), ets_rs.getString(5), ets_rs.getString(6)));
        }
        query.close();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (c != null) {
            c.close();
        }
    }
    JSONObject jsonTable = JsonConvert.getJsonFromPricing(pricing);
    System.out.println(jsonTable);
    return jsonTable;
}

The Pricing class in the Server end converts the Result set to a JSON.

This is the StackTrace:

Exception in thread "AWT-EventQueue-0" com.sun.jersey.api.client.UniformInterfaceException: GET http://localhost:8080/ServerETS/resources/access/loadtable?tablename=prices returned a response status of 500
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:563)
    at com.sun.jersey.api.client.WebResource.get(WebResource.java:179)
    at Link.ClientLink.loadTable(ClientLink.java:60)
    at Interfaces.Pricing.loadTable(Pricing.java:112)
    at Interfaces.Pricing.<init>(Pricing.java:32)
    at Interfaces.MainMenu.panelPricing(MainMenu.java:1026)
    at Interfaces.AdminData.btnAdminDataOKActionPerformed(AdminData.java:150)
    at Interfaces.AdminData.access$000(AdminData.java:26)
    at Interfaces.AdminData$1.actionPerformed(AdminData.java:70)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
    at java.awt.Component.processMouseEvent(Component.java:6288)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
    at java.awt.Component.processEvent(Component.java:6053)
    at java.awt.Container.processEvent(Container.java:2041)
    at java.awt.Component.dispatchEventImpl(Component.java:4651)
    at java.awt.Container.dispatchEventImpl(Container.java:2099)
    at java.awt.Component.dispatchEvent(Component.java:4481)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
    at java.awt.Container.dispatchEventImpl(Container.java:2085)
    at java.awt.Window.dispatchEventImpl(Window.java:2478)
    at java.awt.Component.dispatchEvent(Component.java:4481)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643)
    at java.awt.EventQueue.access$000(EventQueue.java:84)
    at java.awt.EventQueue$1.run(EventQueue.java:602)
    at java.awt.EventQueue$1.run(EventQueue.java:600)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
    at java.awt.EventQueue$2.run(EventQueue.java:616)
    at java.awt.EventQueue$2.run(EventQueue.java:614)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:613)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

And this is the GlassFish Server Log

Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class org.json.simple.JSONObject, and Java type class org.json.simple.JSONObject, and MIME media type application/json was not found
    ... 33 more
Was it helpful?

Solution 3

Changed the Client End as follows

public String loadTable(String tablename) throws ClientProtocolException, IOException {
    pathParams.add("tablename", tablename);
    ClientResponse response = service.path("access").path("loadtable").queryParams(pathParams).type(MediaType.APPLICATION_JSON).get(ClientResponse.class);
    String responseString = response.getEntity(String.class);
    return responseString;
}

and the server end as follows,

@Path("/loadtable")
@GET
@Produces(MediaType.APPLICATION_JSON)
public List<Pricing> loadTable(@QueryParam("tablename") String tablename) throws Exception {
    List<Pricing> pricing = new ArrayList<Pricing>();
    try {
        query = c.prepareStatement("select * from " + tablename);
        ResultSet ets_rs = query.executeQuery();

        while (ets_rs.next()) {
            pricing.add(new Pricing(ets_rs.getString(1), ets_rs.getString(2),  ets_rs.getString(3), ets_rs.getString(4), ets_rs.getString(5), ets_rs.getString(6)));
        }
        query.close();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (c != null) {
            c.close();
        }
    }
    return pricing;
}

And Annotated Pricing with JAXB @XmlRootElement... worked like magic! Thanks @LutzHorn for the comments!

OTHER TIPS

Jersey can't serialize your response of a JSONObject to JSON. Change your method to something like this:

@GET
@Produces(MediaType.APPLICATION_JSON)
public Response loadTable(@QueryParam("tablename") String tablename) throws Exception {
  // ...
  Pricing pricing = ...
  return Response.ok(pricing).build();
}

Annotate Pricing with JAXB @XmlRootElement and let JAXB do the conversion to JSON.

Since you're trying to send the request data as JSON format, you may modify the MIME type of server consumed data type to JSON type:

@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
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