post a Simple JsonRepresentation in Restlet - restlet

Question

Hi I'm new on RestLet this is a simple example that I want to post a Json representation but after running the client I have error which is mentioned in the below.please help me in this regard.Thank you so much.
The resource :
import org.json.JSONException;
import org.json.JSONObject;
import org.restlet.ext.json.JsonRepresentation;
import org.restlet.resource.Post;
import org.restlet.resource.ServerResource;
import org.restlet.data.Status;
public class DepResource extends ServerResource{
String jsonString="";
#Post
public void acceptJsonRepresentation(JsonRepresentation entity) {
JSONObject json = null;
try {
json = entity.getJsonObject();
// business logic and persistence
String jsonPost=json.toString();
System.out.println(jsonPost);
} catch (JSONException e) {
setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
return;
}
}
}
The client has Error in line 44
import java.io.IOException;
import java.net.InetAddress;
import org.json.JSONException;
import org.json.JSONObject;
import org.restlet.data.CharacterSet;
import org.restlet.data.Method;
import org.restlet.ext.json.JsonRepresentation;
import org.restlet.resource.ClientResource;
public class Client {
public static void main(String[] args) throws JSONException, IOException {
/**##POST Prepration##**/
JSONObject jsonObjectGraph = new JSONObject();
jsonObjectGraph.put("Traffic", 100);
jsonObjectGraph.put("Disksize", 20);
String str=jsonObjectGraph.toString();
JsonRepresentation JRRepDep = new JsonRepresentation(str);
JRRepDep.setCharacterSet(CharacterSet.UTF_8);
System.out.println("with jsonrepresentation: "+JRRepDep.getText());
// TODO Auto-generated method stub
/**********POST**************/
String baseURL1 = "http://" + InetAddress.getLocalHost().getHostAddress() + ":" + "8181";
// Specifying the URL for the resource
String resourceName = "/files";
String ApplicationServerName = baseURL1 + resourceName;
System.out.println("URI at client: " +ApplicationServerName);
// Specifying the REST client and post to REST server
ClientResource restletClient = new ClientResource(ApplicationServerName);
System.out.println(ApplicationServerName);
restletClient.setMethod(Method.POST);
System.out.println("dovomi");
restletClient.post(JRRepDep);
System.out.println("After post");
// Checking the status of the post request
if (restletClient.getStatus().isSuccess())
{
System.out.println("POST Request success.");
restletClient.release();
}
}
}
The server is running without any error
import java.net.InetAddress;
import org.restlet.Application;
import org.restlet.Restlet;
import org.restlet.Server;
import org.restlet.data.Protocol;
import org.restlet.routing.Router;
public class DepServer extends Application {
private static String ipAddress;
private static int port;
public static String getURI()
{
return "http://" + ipAddress + ":" + port;
}
public static void main(String[] args) {
try {
ipAddress = InetAddress.getLocalHost().getHostAddress();
port = 8181;
Server server = new Server(Protocol.HTTP, ipAddress, port);
server.setNext(new DepServer());
server.start();
System.out.print("Server is running");
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public Restlet createInboundRoot() {
String baseURL = "http://" + ipAddress + ":" + port;
// Create a router restlet.
Router router = new Router(getContext());
// Attach the resources to the router.
router.attach(baseURL + "/files", DepResource.class);
// Return the root router
return router;
}
}
Error:
Jul 20, 2019 2:00:03 PM org.restlet.engine.http.connector.HttpClientHelper start
INFO: Starting the default HTTP client
Exception in thread "main" Internal Server Error (500) - Internal Server Error
at org.restlet.resource.ClientResource.handle(ClientResource.java:870)
at org.restlet.resource.ClientResource.post(ClientResource.java:1209)
at Client.main(Client.java:44)

Answer 1

The question is quite unclear, but if you're asking how to return a JsonRepresentation then you must not return a void but rather a JsonRepresentation see:
public class DepResource extends ServerResource {
String jsonString="{}";
#Post
public JsonRepresentation acceptJsonRepresentation(JsonRepresentation entity) {
// do stuff and return a JsonRepresentation object
Representation representation = new JsonRepresentation(jsonString);
return representation;
}
}