title: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
body: <p>i am trying to connect my java app with sql database and when i click on save button it gives me following error</p>
  
  <pre><code>com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
  </code></pre>
  
  <p>here's my code</p>
  
  <pre><code>        name = full_name_input.getText();
          Fname = father_name_input.getText();
          cnic = father_cnic_input.getText();
          DOB = Integer.parseInt(DOB_input.getText());
          Class_V = Integer.parseInt(class_input.getText()); 
          prsnt_add = present_add_input.getText();
          city = city_input.getText();
          province = radio_text;
          Connection conn = null;
          PreparedStatement pst = null;
  
          try
          {
              Class.forName("com.mysql.jdbc.Driver");
              conn = DriverManager.getConnection("jdbc:mysql:///UserDetails", "root", "sahanj");
              pst = conn.prepareStatement("insert into UserDetails values (?,?,?,?,?,?,?,?)");
  
              pst.setString(1, name);
              pst.setString(2, Fname);
              pst.setString(3, cnic);`enter code here`
              pst.setInt(4, DOB);
              pst.setInt(5, Class_V);
              pst.setString(6, prsnt_add);
              pst.setString(7, city);
              pst.setString(8, province);
  
              int x = pst.executeUpdate();
  
              if (x&gt;0)
              {
                  JOptionPane.showMessageDialog(null, "Record Saved !\n");
              }
              else
              {
                  JOptionPane.showMessageDialog(null, "Data Not Saved !\n");
              }
          }
  
          catch(Exception e)
          {
              JOptionPane.showMessageDialog(null, e);
          }
  }                                  
  </code></pre>