Question

I am trying to add records to Sql Server in Java. In this function, program gives an error like that:

Connected
1
2
Error java.lang.NullPointerException

It is the output..

Function is below:

public class DB {

    Connection con = null;
    Statement stmt Nnull ;
    component cmp = new Component();

    public long pSave(Component cmp) {
        String i = cmp.getI();
        String s = cmp.getS();
        String a = cmp.getA();
        int t = cmp.getT();
        int c = cmp.getC();

        System.out.println("1");

        try {
            System.out.println("2");
            stmt = con.createStatement();

            System.out.println("3");
            String SQL =
                "INSERT INTO kisi (cl1,cl2,cl3,cl4,cl5) "
                + "VALUES(" + i + "," + s + "," + a + "," + c + "," + t + ")";

            System.out.println("4");
            stmt.executeUpdate(SQL);

            System.out.println("Success");

            return 1;
        } catch(Exception e) {
            System.out.println("Error " + e);
            return 0;
        }
    }

}

Answer 1

Connection con = null;
......
stmt = con.createStatement();
        ^

The connection is not initialized. You have to connect to DB in order to retrieve data.