Whats wrong with this JSP code

debugcn Published at Dev

Sagar Sutar

Whats wrong with my JSP code here... The java file runs successfully but when I invoke the method through JSP, it doesn't work on throws an error where obj.insertData() method is called.

<%@ page import="lvsdummy.AddCustomer, java.sql.*"%>
<html>
<head>
<title>Welcome page</title>
</head>
<body>
    <%
        AddCustomer obj = new AddCustomer();
        obj.openConn();
        obj.insertData();
    %>

</body>
</html>

Here's the Java file-

package lvsdummy;

import java.sql.*;

public class AddCustomer {
    String url = "jdbc:mysql://localhost:3306/lvs_db";
    String user_name = "root";
    String password = "root";

    Connection conn;
    PreparedStatement st;
    ResultSet rs;

    public void openConn() {
        try {
            conn = DriverManager.getConnection(url, user_name, password);

        } catch (SQLException e) {
            e.getLocalizedMessage();
        }
    }

    public String insertData() {
            String value = "";
            try {
                st = conn.prepareStatement("SELECT * FROM customer");
                //st.setString(1, firstname);
                //st.setLong(2, mobile1);
                rs = st.executeQuery();

                if (rs.next()) {
                    value = "Success";
                } else {
                    value = "Failed";
                }

            } catch (SQLException e) {
                e.getLocalizedMessage();
            }

            return value;
        }

    public static void main(String[] args) {
        AddCustomer obj = new AddCustomer();
        obj.openConn();
        System.out.println(obj.insertData());
    }
}

Here's the error -

org.apache.jasper.JasperException: An exception occurred processing JSP page /addCustomer.jsp at line 10

7:  <%
8:      AddCustomer obj = new AddCustomer();
9:      obj.openConn();
10:         obj.insertData();
11:     %>
12: 
13: </body>

root cause
java.lang.NullPointerException
    lvsdummy.AddCustomer.insertData(AddCustomer.java:26)

Subhasish Bhattacharjee

Please try to avoid scriptlets as said above. One more point is that did you anywhere loaded the driver? Please try using if not yet