title: Why does Eclipse say that "errors exist" but shows nothing in console?
body: <p>I am using Eclipse to build a program and when I go to run it, it says that "errors exist", I run it anyway, there are no errors showing up in the console and the application runs a blank screen. Why is this?</p>
  
  <p>Additional Info: I recently have been trying to change my previous layout, from a very crude form, to utilizing GridBagLayout, however i am not very familiar with using layouts. I strongly suspect the problem lies in, or revolves around, my layout since the program properly functioned before I tried making changes. </p>
  
  <p>Here are my two main classes that involve the layout, sorry for it being messy, I commented out a lot of lines that worked for the previous layout in case I have to revert back to it:</p>
  
  <pre><code>import java.awt.*;
  import java.sql.SQLException;
  import java.util.LinkedList;
  
  import javax.swing.ImageIcon;
  import javax.swing.JButton;
  import javax.swing.JFrame;
  import javax.swing.JLabel;
  import javax.swing.JLayeredPane;
  import javax.swing.JPanel;
  import javax.swing.Timer;
  import javax.swing.UIManager;
  import javax.swing.border.Border;
  import javax.swing.plaf.ColorUIResource;
  
  import java.sql.*;
  
  public class MainDisplay extends JFrame {
  
  static Toolkit tk = Toolkit.getDefaultToolkit();
  static int Width = (int)tk.getScreenSize().getWidth();
  static int Height = (int)tk.getScreenSize().getHeight();
  
  //public static JFrame frame = new JFrame();
  public static JPanel pane = new JPanel();
  
  
  private static String targetIpHolder;
  private static String attackerIpHolder;
  private static int threatLevelHolder; 
  private static String numAttacksHolder;
  
  public static void main (String[] args) {
  new MainDisplay();
  
  }
  
  public MainDisplay() {
  
  
  setPreferredSize(new Dimension(Width, Height));
  setLocation(0,0);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setUndecorated(true);
  
  
  
  //pane.setLayout(gridBag);
  setLayout(new BorderLayout());
  //add(pane, BorderLayout.CENTER);
  pane.setBounds(0,0, Width, Height);
  
  pack();
  setVisible(true);
  
  ThreatPanel Run = new ThreatPanel();
  Database Data = new Database();
  
  //Create Connection to Database and run query
  
  Data.createConnection();
  Data.getData();
      try {
          while(Data.rslt.next()){
              Data.process();
              targetIpHolder = Data.getTarget();
              attackerIpHolder = Data.getAttacker();
              threatLevelHolder = Data.getThreat_level();
              numAttacksHolder = Data.getNum_attack();
              //System.out.println(targetIpHolder);
              //System.out.println(attackerIpHolder);
              Run.ShowThreats();
              try {
                  Thread.sleep(1000*1); 
              } catch (InterruptedException e) {
  
                  e.printStackTrace();
              }
  
          }
      } catch (SQLException e) {
  
          e.printStackTrace();
      }
  
  
  
  }
  
  public static String getTargetIpHolder(){
  return targetIpHolder;
  }
  public static String getAttackerIpHolder(){
  return attackerIpHolder;
  }
  public static int getThreatLevelHolder(){
  return threatLevelHolder;
  }
  public static String getNumAttacks(){
  return numAttacksHolder;
  }
  
  }
  </code></pre>
  
  <hr>
  
  <pre><code>import java.awt.Color;
  import java.awt.Font;
  import java.awt.GridBagConstraints;
  import java.awt.GridBagLayout;
  import java.awt.Image;
  import java.awt.image.RenderedImage;
  import java.io.BufferedInputStream;
  import java.io.BufferedReader;
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.net.MalformedURLException;
  import java.net.URL;
  
  
  import javax.imageio.ImageIO;
  import javax.swing.Icon;
  import javax.swing.ImageIcon;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.SwingConstants;
  
  
  
  public class ThreatPanel {
  
  JPanel BackPanel = new JPanel();
  //JPanel HeadingBreak = new JPanel();
  JPanel DarkPanel = new JPanel();
  //JPanel HeadingBreak = new JPanel();
  //JPanel HorizontalSplit1 = new JPanel();
  //JPanel HorizontalSplit2 = new JPanel();
  //JPanel VerticalSplit = new JPanel();
  
  public GridBagLayout gridBag = new GridBagLayout();
  public GridBagConstraints gbc = new GridBagConstraints();
  
  
  final int TEST = 0;
  final int TEST2 = 100;
  final int TEST3 = 200;
  
  private String city;
  private String region;
  private String latitude;
  private String longitude;
  private Image img;
  private ImageIcon icon;
  
  Color severeColor = new Color(225,102,00);
  
  URL geoLocRetriever;
  
  
  //Target area declarations. 
  String Client = "CLIENT"; //filler
  JLabel Target = new JLabel("TARGET");
  JLabel ClientLabel = new JLabel(Client); //filler
  JLabel TargetServerData;
  JLabel ServerID = new JLabel("SERVER ID");
  
  //Attacker area declarations.
  JLabel Attacker = new JLabel("ATTACKER");
  JLabel AttackerData;
  JLabel GeoLocData;
  JLabel GeoLocImg;
  JLabel GeoLocLabel = new JLabel("GEO LOCATION");
  
  //Threat Level area declarations.
  JLabel ThreatLevel = new JLabel("THREAT");
  JLabel ThreatLevelData;
  
  //Number of Attacks declarations
  JLabel NumberOfAttacks = new JLabel("ATTACKS");
  JLabel NumberOfAttacksData;
  
  
  public ThreatPanel()
  {
  DarkPanel.setLayout(gridBag);
  
  TargetServerData = new JLabel();
  AttackerData = new JLabel();
  ThreatLevelData = new JLabel();
  NumberOfAttacksData = new JLabel();
  GeoLocData = new JLabel();
  GeoLocImg = new JLabel();
  
  
  BackPanel.setLayout(null);
  BackPanel.setBackground(Color.WHITE);
  BackPanel.setBounds(0,0, MainDisplay.Width, MainDisplay.Height);
  BackPanel.setOpaque(true);
  /*
  HeadingBreak.setBackground(Color.WHITE);
  HeadingBreak.setBounds(0, 80, MainDisplay.Width, 3);
  HeadingBreak.setOpaque(true);
  */
  /*
  HorizontalSplit1.setBackground(Color.WHITE);
  HorizontalSplit1.setBounds(0, MainDisplay.Height/2, MainDisplay.Width, 3);
  HorizontalSplit1.setOpaque(true);
  */
  /*
  HorizontalSplit2.setBackground(Color.WHITE);
  HorizontalSplit2.setBounds(0, MainDisplay.Height/2+80, MainDisplay.Width, 3);
  HorizontalSplit2.setOpaque(true);
  */
  /*
  VerticalSplit.setBackground(Color.WHITE);
  VerticalSplit.setBounds((int)(MainDisplay.Width/1.5), 0, 3, MainDisplay.Height);
  VerticalSplit.setOpaque(true);
  */
  //Target area settings. 
  
  Target.setFont(new Font("Arial", Font.BOLD, 85));
  Target.setForeground(Color.GREEN);
  Target.setBounds(0, 0, ((int)(MainDisplay.Width/1.5)-3), 75);
  Target.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 0;
  gbc.gridy = 0;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(Target, gbc);
  
  ClientLabel.setForeground(Color.WHITE);
  ClientLabel.setFont(new Font("Arial", Font.BOLD, 100));
  ClientLabel.setBounds(0, 115, ((int)(MainDisplay.Width/1.5)-3), 95);
  ClientLabel.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 0;
  gbc.gridy = 1;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(ClientLabel, gbc);
  
  
  TargetServerData.setForeground(Color.WHITE);
  TargetServerData.setFont(new Font("Arial", Font.BOLD, 120));
  TargetServerData.setBounds(0, 230, ((int)(MainDisplay.Width/1.5)-3), 95);
  TargetServerData.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 0;
  gbc.gridy = 2;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(TargetServerData, gbc);
  
  ServerID.setForeground(Color.WHITE);
  ServerID.setFont(new Font("Arial", Font.BOLD, 120));
  ServerID.setBounds(0, 230, ((int)(MainDisplay.Width/1.5)-3), 95);
  ServerID.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 0;
  gbc.gridy = 3;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(ServerID, gbc);
  
  Attacker.setFont(new Font("Arial", Font.BOLD, 85));
  Attacker.setForeground(Color.RED);
  Attacker.setBounds(0, (MainDisplay.Height/2)+3, ((int)(MainDisplay.Width/1.5)-3), 75);
  Attacker.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 0;
  gbc.gridy = 4;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(Attacker, gbc);
  
  AttackerData.setForeground(Color.RED);
  AttackerData.setFont(new Font("Arial", Font.BOLD, 70));
  AttackerData.setBounds(0, ((int)(MainDisplay.Height/1.5)-3), ((int)(MainDisplay.Width/1.5)-3), 75);
  AttackerData.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 0;
  gbc.gridy = 5;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(AttackerData, gbc);
  
  GeoLocData.setFont(new Font("Arial", Font.BOLD, 70));
  GeoLocData.setForeground(Color.RED);
  GeoLocData.setBounds(0, (int)(MainDisplay.Height/1.2), ((int)(MainDisplay.Width/1.5)-3), 75);
  GeoLocData.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 0;
  gbc.gridy = 6;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(GeoLocData, gbc);
  
  ThreatLevel.setFont(new Font("Arial", Font.BOLD, 85));
  ThreatLevel.setForeground(Color.GREEN);
  ThreatLevel.setBounds(725, 0, ((int)(MainDisplay.Width/1.5)-3), 75);
  ThreatLevel.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 1;
  gbc.gridy = 0;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(ThreatLevel, gbc);
  
  ThreatLevelData.setFont(new Font("Arial", Font.BOLD, 100));
  ThreatLevelData.setBounds(725, 105, ((int)(MainDisplay.Width/1.5)-3), 95);
  ThreatLevelData.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 1;
  gbc.gridy = 1;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(ThreatLevelData, gbc);
  
  
  NumberOfAttacks.setFont(new Font("Arial", Font.BOLD, 85));
  NumberOfAttacks.setForeground(Color.RED);
  NumberOfAttacks.setBounds(725, (MainDisplay.Height/2)+3, ((int)(MainDisplay.Width/1.5)-3), 75);
  NumberOfAttacks.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 1;
  gbc.gridy = 2;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(NumberOfAttacks, gbc);
  
  NumberOfAttacksData.setFont(new Font("Arial", Font.BOLD, 85));
  NumberOfAttacksData.setForeground(Color.RED);
  NumberOfAttacksData.setBounds(725, (int) ((MainDisplay.Height/1.5)), ((int)(MainDisplay.Width/1.5)-3), 75);
  NumberOfAttacksData.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 1;
  gbc.gridy = 3;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(NumberOfAttacksData, gbc);
  
  GeoLocLabel.setFont(new Font("Arial", Font.BOLD, 85));
  GeoLocLabel.setForeground(Color.RED);
  GeoLocLabel.setBounds(0, (MainDisplay.Height/2)+3, ((int)(MainDisplay.Width/1.5)-3), 75);
  GeoLocLabel.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 1;
  gbc.gridy = 4;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(GeoLocLabel, gbc);
  
  GeoLocImg.setBounds(1050, 590, 300, 300);
  GeoLocImg.setHorizontalAlignment(SwingConstants.CENTER);
  gbc.gridx = 1;
  gbc.gridy = 5;
  gbc.gridheight = 2;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  DarkPanel.add(GeoLocData, gbc);
  
  //Remaining settings.
  /*
  //DarkPanel.setLayout(null);
  //DarkPanel.setBackground(Color.BLACK);
  //DarkPanel.setBounds(3, 3, ((MainDisplay.Width)-6), ((MainDisplay.Height)-6));
  //DarkPanel.setOpaque(true);
  ////DarkPanel.add(Target);
  //DarkPanel.add(HeadingBreak);
  //DarkPanel.add(VerticalSplit);
  //DarkPanel.add(HorizontalSplit1);
  //DarkPanel.add(HorizontalSplit2);
  DarkPanel.add(ClientLabel);
  DarkPanel.add(TargetServerData);
  DarkPanel.add(ThreatLevel);
  DarkPanel.add(ThreatLevelData);
  DarkPanel.add(Attacker);
  DarkPanel.add(AttackerData);
  DarkPanel.add(NumberOfAttacks);
  DarkPanel.add(NumberOfAttacksData);
  DarkPanel.add(GeoLocData);
  DarkPanel.add(GeoLocImg);
  */
  
  BackPanel.add(DarkPanel);
  
  MainDisplay.pane.add(BackPanel, new Integer(0), 0);
  
  }
  
  public void getGeoLoc()
  {
  String locHolder;
  try {
      geoLocRetriever = new URL("http://ip-api.com/line/*******"); //+ MainDisplay.getAttackerIpHolder()
  } catch (MalformedURLException e) {
      e.printStackTrace();
  }
  
  InputStream stream = null;
  try {
      stream = geoLocRetriever.openStream();
  } catch (IOException e1) {
      e1.printStackTrace();
  }
  ByteArrayOutputStream buffer = new ByteArrayOutputStream();
  if (stream != null) try {
      final BufferedInputStream input = new BufferedInputStream(stream);
      final byte[] reader = new byte[16384];
      int r = 0;
      while ((r = input.read(reader, 0, 16384)) != -1)
          buffer.write(reader, 0, r);
      buffer.flush();
  } catch(IOException e) {
      e.printStackTrace();
  } finally {
      if(stream != null) try {
          stream.close();
      } catch(IOException e) {
          e.printStackTrace();
      }
  }
  
  
  locHolder = new String(buffer.toByteArray());
  String[] lines = locHolder.split("\n");
  //System.out.print(lines[5]);
  
  city = lines[5];
  region = lines[4];
  latitude = lines[7];
  longitude = lines[8];
  
  String temp;
  temp="https://maps.googleapis.com/maps/api/staticmap?center=" +latitude +"," +longitude +"&amp;zoom=7&amp;size=300x300&amp;markers=color:red|label:A|" +latitude +"," +longitude +"&amp;sensor=false";
  URL mapurl = null;
  try {
      mapurl = new URL(temp);
  } catch (MalformedURLException e) {
      e.printStackTrace();
  }
  try {
      img = ImageIO.read(mapurl);
  } catch (IOException e) {
      e.printStackTrace();
  }
  icon = new ImageIcon(img);  
  }
  
  public void ShowThreats(){
  
      String targetEnd = MainDisplay.getTargetIpHolder();     
      TargetServerData.setText(targetEnd);
  
      String attackerEnd = MainDisplay.getAttackerIpHolder();
      AttackerData.setText(attackerEnd);
  
      getGeoLoc();
      String geoLocEnd = city + "," + region;
      GeoLocData.setText(geoLocEnd);
      GeoLocImg.setIcon(icon);
  
  
      int threatLevelEnd = MainDisplay.getThreatLevelHolder();
      //System.out.println(threatLevelEnd);
      if ((threatLevelEnd &gt; TEST ) &amp;&amp; (threatLevelEnd &lt; TEST2)){
          ThreatLevelData.setText("WARNING");
          ThreatLevelData.setForeground(Color.YELLOW);
      }
      else if ((threatLevelEnd &gt; TEST2 ) &amp;&amp; (threatLevelEnd &lt; TEST3)){
          ThreatLevelData.setText("SEVERE");
          ThreatLevelData.setForeground(severeColor);
      }
      else if (threatLevelEnd &gt; TEST3){
          ThreatLevelData.setText("CRITICAL");
          ThreatLevelData.setForeground(Color.RED);
      }
      else{
          ThreatLevelData.setText("ERROR");
          ThreatLevelData.setForeground(Color.PINK);
      }
  
      String numAttacksEnd = MainDisplay.getNumAttacks();
      NumberOfAttacksData.setText(numAttacksEnd);
      //System.out.println(numAttacksEnd);
  
  }
  
  }
  </code></pre>