WebService（JAX-WS）中的创建方法以将数据发送到mysql DB

Question

Hi everybody..

I'm new to web services so tried to create simple web service (jax-ws) on glass fish server 4.1.1, this service sending data to mysql database like this but I'm getting this error why I don't know!?!?

MY CODES:

    package com.me.coder;

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.Statement;
    import javax.jws.WebService;
    import javax.jws.WebMethod;
    import javax.jws.WebParam;

    /**
     *
     * @author MacbookPro
     */
    @WebService(serviceName = "GetWriteToDB")
    public class GetWriteToDB {

        /**
         * Web service operation
         */

        @WebMethod(operationName = "sendToDb")
        public void sendToDb(@WebParam(name = "id") int id, @WebParam(name = "name") String name, @WebParam(name = "location") double location, @WebParam(name = "date") String date) {
           String host = "jdbc:mysql://localhost/onurDB";
            String user = "onur";
            String pass = "onurdb958";

            try(Connection conn = DriverManager.getConnection(host,user,pass);
                Statement smt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);   
               ){
                String SQL = "INSERT INTO `GoogleLoc`(`ID`, `NAME`, `LOCATION`, `DATE`) VALUES ('" + id + "','" + name + "','"+ location + "','" + date + "')";
                smt.executeUpdate(SQL);

            }catch(SQLException ex){
                System.out.println("SQLException : " + ex);
            }  

        }
    }

For control,same codes tried using in java SE class worked perfectly. Like this:

package send;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 *
 * @author MacbookPro
 */
public class Send {

    /**
     * @param args the command line arguments
     */
    private static String name,date;
    private static int location,id;


    public static void main(String[] args) throws IOException {
         String host = "jdbc:mysql://localhost/onurDB";
        String user = "onur";
        String pass = "onurdb958";

        try(Connection conn = DriverManager.getConnection(host,user,pass);
            Statement smt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);   
           ){

            insertData(smt);
        }catch(SQLException ex){
            System.out.println("SQLException : " + ex);
        }  
    }
       private static void insertData(Statement smt) throws SQLException, IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("Enter ID : ");
        String id = bf.readLine();
        System.out.print("Enter Name : ");
        String name = bf.readLine();
        System.out.print("Enter Location : ");
        String location = bf.readLine();
        System.out.print("Enter Date : ");
        String date = bf.readLine();
        String sql;
        sql = "INSERT INTO `GoogleLoc`(`ID`, `NAME`, `LOCATION`, `DATE`) VALUES ('" + id + "','" + name + "','"
                + location + "','" + date + "')";
        smt.executeUpdate(sql);
        System.out.println("Success! data inserted.");
    }
}

I can imagine my fault in @WebMethod

Somebody can help me please???

THANKS FOR ALL..

Answer 1

Your NullPointerException is raised from the WebserviceTesterServlet class which is a GlassFish WS tool class for helping you to call a webservice. It's a graphical client for your webservice. Maybe, the problem comes from this class, maybe from your implementation. With this stracktrace, it is hard to guess.

The problem is that WebserviceTesterServlet doesn't give a helpful exception. So, we cannot understand the cause. I propose you three solutions to solve your problem :

• Download the source jar containing WebserviceTesterServlet (take the version you use), put a breakpoint on the line 342 of this class and run your server in debug mode.
• Trying with SOAP UI for calling your operation.
• Create your own code for calling the webService and test your webservice operation. You can do it easily by generating the proxy classes. You can use for example use JAX-WS and do a wsimport.

Answer 2

Solved !

We need to change codes like this :

    package com.me.coder;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.ws.rs.GET;

/**
 *
 * @author Coder ACJHP
 */
@WebService(serviceName = "GetWriteToDB")
public class GetWriteToDB {

    /**
     * Web service operation
     *
     * @param id
     * @param name
     * @param location
     * @param date
     * @return
     */
    @GET
    @WebMethod(operationName = "insertUser")
    public boolean insertUser(@WebParam(name = "id") int id, @WebParam(name = "name") String name,
            @WebParam(name = "location") double location, @WebParam(name = "date") String date) {
        boolean insertStatus = false;
        final String host = "jdbc:mysql://localhost/onurDB";
        final String user = "onur";
        final String pass = "onurdb958";
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
            Logger.getLogger(GetWriteToDB.class.getName()).log(Level.SEVERE, null, ex);
        }
        try (
                Connection conn = DriverManager.getConnection(host, user, pass);
                Statement smt = conn.createStatement();) {
            String SQL = "INSERT INTO `GoogleLoc`(`ID`, `NAME`, `LOCATION`, `DATE`) VALUES ('" + id + "','" + name + "','" + location + "','" + date + "')";
            int x = smt.executeUpdate(SQL);
            if (x > 0) {
                insertStatus = true;
            }

        } catch (SQLException e) {
            System.out.println(e.getMessage());
        }
        return insertStatus;
    }

}