@Override
public boolean login(String username, String password) throws RemoteException {
    boolean b = false;
    try {
        Connection db_con = databaseConnection();
        Statement stmt = db_con.createStatement();
        String sql = "SELECT * FROM books_db.user WHERE user_id = '" + username + "' and status = 'active'";

        ResultSet rs=stmt.executeQuery(sql);

        String checkusername = rs.getString(1);
        String checkpassword = rs.getString(2);

        if (checkusername.equals(username) && checkpassword.equals(password)) {
            b = true;
        } else {
            b = false;
        }

    } catch (Exception e) {
    }
    return b;
}

public boolean login(String username, String password) throws RemoteException;

Message impl = (Message) myRegistry.lookup("asd");
        String u = "20160001";
        String p = "p";
        boolean r = impl.login(u, p);

        if (r == true) {
            System.out.println("success");
        } else {
            System.out.println("fail");
        }