I cannot register data using JAVA Rest webservice

Question

When registering data in my database using webservice the following error occurs.

Sending 'POST' request to URL : http://localhost:8080/FazendaWS/webresources/fazenda/Usuario/inserir
Post parameters : {"login":"felipe10","senha":"1234","email":"[email protected]","perfil":"teste100"}
Response Code : 415
 Exception in thread "main" java.io.IOException: Server returned HTTP response code: 415 for URL: http://localhost:8080/FazendaWS/webresources/fazenda/Usuario/inserir
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1944)
at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1939)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1938)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1508)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at consumindows.HttpExemplo.sendPost(HttpExemplo.java:165)
at consumindows.HttpExemplo.main(HttpExemplo.java:50)
Caused by: java.io.IOException: Server returned HTTP response code: 415 for URL: http://localhost:8080/FazendaWS/webresources/fazenda/Usuario/inserir
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1894)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at consumindows.HttpExemplo.sendPost(HttpExemplo.java:159)
... 1 more

REST Web Service

    package ws;

  import com.google.gson.Gson;
  import dao.UsuarioDAO;
  import javax.ws.rs.core.Context;
  import javax.ws.rs.core.UriInfo;
  import javax.ws.rs.Produces;
  import javax.ws.rs.Consumes;
  import javax.ws.rs.POST;
  import javax.ws.rs.PathParam;
  import javax.ws.rs.core.MediaType;
  import modelo.Usuario;

   /**
   * REST Web Service
   *
  * @author Felipe
   */
  @Path("fazenda")
  public class FazendaWS {

@Context
private UriInfo context;


public FazendaWS() {
    @POST
@Consumes({"application/json"})
@Path("Usuario/inserir")

public boolean inserir(String content){
 Gson g = new Gson();
Usuario u = (Usuario) g.fromJson(content, Usuario.class);
    UsuarioDAO dao = new UsuarioDAO();  
    return dao.inserir(u);
         }
     }
   }

httpExemplo

 package consumindows;

  import com.google.gson.Gson;
 import com.google.gson.reflect.TypeToken;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.Proxy.Type;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import modelo.Usuario;


public class HttpExemplo {

private final String USER_AGENT = "Mozilla/5.0";

public static void main(String[] args) throws Exception {


        HttpExemplo http = new HttpExemplo();

            Gson g =new Gson();
            Usuario u = new Usuario();

            java.lang.reflect.Type usuarioType= new TypeToken<Usuario>() {}.getType();
            String url;


u.setEmail("[email protected]");
    u.setLogin("felipe10");
    u.setPerfil("teste100");
    u.setSenha("1234");
    System.out.println(u.getLogin()); 

     String json=g.toJson(u, usuarioType);

    url="http://localhost:8080/FazendaWS/webresources/fazenda/Usuario/inserir";
               http.sendPost(url,json,"POST");
   }

    // HTTP POST request
private void sendPost(String url,String urlParameters,String method) throws Exception {

    URL obj= new URL(url);
            HttpURLConnection con=(HttpURLConnection) obj.openConnection();
    //add reuqest header
    con.setRequestMethod(method);
    con.setRequestProperty("User-Agent", "application/json");
            con.setRequestProperty("User-Agent", USER_AGENT);
    con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

    //String urlParameters = "sn=C02G8416DRJM&cn=&locale=&caller=&num=12345";

    // Send post request
    con.setDoOutput(true);
    DataOutputStream wr = new DataOutputStream(con.getOutputStream());
    wr.writeBytes(urlParameters);
    wr.flush();
    wr.close();

    int responseCode = con.getResponseCode();
    System.out.println("\nSending 'POST' request to URL : " + url);
    System.out.println("Post parameters : " + urlParameters);
    System.out.println("Response Code : " + responseCode);

    BufferedReader in = new BufferedReader(
            new InputStreamReader(con.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();

    //print result
    System.out.println(response.toString());

}


 }

Answer 1

The http error 415 is when the service provider, in the case of its webservice, does not support the format of the data sent, in the case of json.

On the line: con.setRequestProperty("User-Agent", "application/json");

Switches to: con.setRequestProperty("Content-Type", "application/json");

Should solve error 415 problem.