private void jLoggaInActionPerformed(java.awt.event.ActionEvent evt) {

        String username = jUsername.getText();
        String password = jPassword.getText();
       try {
          minDataBasKoppling = new InfDB("/db");

           ArrayList<String> kollaNamn = minDataBasKoppling.fetchColumn("SELECT fornamn from larare");
           ArrayList <String> kollaLosenord = minDataBasKoppling.fetchColumn("SELECT losenord from larare where losenord = " + password);

        int i = 0;
        boolean hittad = false;
        while (i < kollaNamn.size() && !hittad)
        {
         String namnKoll = kollaNamn.get(i).toString();
         String losKoll = kollaLosenord.get(i).toString();

          if (username.equals(namnKoll) && password.equals(losKoll))


       {

          startaLarareInloggad();
          JOptionPane.showMessageDialog(null, "Login Successful");
          jUsername.setText(null);
          jPassword.setText(null);
          i++;
       }

       }

       }
       catch (InfException ettUndantag) {

       JOptionPane.showMessageDialog(null, "Login Failed");

       }