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Editorial Team
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Asked: 2026-06-12T05:38:24+00:00

Here is code: String sql_1 = select emp_id,password from regid; ResultSet rs = st.executeQuery(sql_1);

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Here is code:

 String sql_1 = "select emp_id,password from regid";
    ResultSet rs = st.executeQuery(sql_1);

    while(rs.next())
    {

    if(((employee.equals(rs.getString("emp_id"))) && (password.equals(rs.getString("password"))))==true)
    {

//      String sql2="update regid set regid='"+Datastore.regIds.add(regId)+"' where emp_id='"+employee+"'";
//      st.executeUpdate(sql2);
        System.out.println("2> Employee Id : "+employee+" && Password : "+password);
        System.out.println("3> This employee "+employee+" exsists in the database and registration-password id will be Updated");

    //  resp.setStatus(HttpServletResponse.SC_OK);
        resp.setContentType("text/html");
        PrintWriter out = resp.getWriter();
        out.print("<html><body>");
        out.print("<head>");
        out.print("<title>Policy Page</title>");
        out.print("<link rel='icon' href='../images/favicon.png'/>");
        out.print("</head>");
        String status = (String) req.getAttribute(ATTRIBUTE_STATUS);
        if (status != null)
        {
          out.print("Status :"+status);
        }
        List<String> devices = Datastore.getDevices();
        if (devices.isEmpty())
        {
          out.print("<h2>No  devices registered!</h2>");
        } 
        else
        {

         out.print("<h2>" + devices.size() + " device(s) registered!</h2>");
         out.print("<form name='form' method='POST' action='sendAll'>");
         out.print("<input type='text' name='policy'>");
         resp.setStatus(HttpServletResponse.SC_OK);
         out.print("<input type='submit' value='Apply Policy'>");
         out.print("</form>");
//       System.out.println(HTTP_STATUS);
         System.out.println(HttpServletResponse.SC_OK);
         getServletContext().getRequestDispatcher("/home").forward(req, resp);

        }
        out.print("</body></html>");
        resp.setStatus(HttpServletResponse.SC_OK);

    }

    else {
        resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
        System.out.println(HttpServletResponse.SC_BAD_REQUEST);
        System.out.println("4> This employee "+employee+" does not exsist in the database");            
    }

    }

//    rs.close();
    }

But I’m getting output like,but I’m putting the correct emp_id & password(still it’s showing 4> + java.lang.illegalstateexception (don’t know why ?? 🙁 )): 

1> Employee : P1 && Password : ppp
400
4> This employee P1 does not exsist in the database
2> Employee Id : P1 && Password : ppp
3> This employee P1 exsists in the database and registration-password id will be Updated
400
4> This employee P1 does not exsist in the database

any idea…..why it’s happening ?

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1 Answer

  1. Editorial Team

    It’s happening because you algorithm consists of:

    1. Iterate through all employees
    2. If employee matches ID/password, print 2>, else print 4>

    So you’ll have one 2>, 3> output for the one that matches and all the others will give you the error 400.

    Instead, you can iterate through all your employees (although it might be best to add a criteria to your SQL to narrow down the result set by password and employee ID), don’t output an error unless you have exhausted all the results and did not find the matching one.

    PreparedStatement stmt = null;
try {
    stmt = new PreparedStatement("select * from regis where emp_id=? and password=?");
    stmt.setString(1, employee);
    stmt.setString(2, password);

    ResultSet rs = stmt.executeQuery();
    if(rs.next()) {
        System.out.println("2> Employee Id : "+employee+" && Password : "+password);
        System.out.println("3> This employee "+employee+" exsists in the database and                        
        resp.setContentType("text/html");
        PrintWriter out = resp.getWriter();
        out.print("<html><body>");
        out.print("<head>");
        out.print("<title>Policy Page</title>");
        out.print("<link rel='icon' href='../images/favicon.png'/>");
        out.print("</head>");
        String status = (String) req.getAttribute(ATTRIBUTE_STATUS);
        if (status != null)
        {
          out.print("Status :"+status);
        }
        List<String> devices = Datastore.getDevices();
        if (devices.isEmpty())
        {
          out.print("<h2>No  devices registered!</h2>");
        } 
        else
        {

         out.print("<h2>" + devices.size() + " device(s) registered!</h2>");
         out.print("<form name='form' method='POST' action='sendAll'>");
         out.print("<input type='text' name='policy'>");
         resp.setStatus(HttpServletResponse.SC_OK);
         out.print("<input type='submit' value='Apply Policy'>");
         out.print("</form>");
//       System.out.println(HTTP_STATUS);
         System.out.println(HttpServletResponse.SC_OK);
         getServletContext().getRequestDispatcher("/home").forward(req, resp);

        }
        out.print("</body></html>");
        resp.setStatus(HttpServletResponse.SC_OK);

    }

    else {
        resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
        System.out.println(HttpServletResponse.SC_BAD_REQUEST);
        System.out.println("4> This employee "+employee+" does not exsist in the database");            
    }
}
catch(Exception e) {
    e.printStackTrace();
}
finally {
    try {
        stmt.close();
    } catch(Exception x) {}
}
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