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Why does Eclipse say that "errors exist" but nothing is displayed in the console?

I use Eclipse to build the program, and when I go to run it, it says that "there are errors", I still run it, there are no errors in the console, and the application launches a blank screen. Why is this?

Additional Information: Recently I tried to change my previous layout, from a very rough form, to using GridBagLayout, however I am not very good at using layouts. I strongly suspect that the problem is in my layout, or it revolves around, as the program functioned correctly before I tried to make changes.

Here are my two main classes that are related to the layout, sorry to be confused, I commented on a lot of the lines that worked for the previous layout, in case I should go back to it:

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; } } 
 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 +"&zoom=7&size=300x300&markers=color:red|label:A|" +latitude +"," +longitude +"&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 > TEST ) && (threatLevelEnd < TEST2)){ ThreatLevelData.setText("WARNING"); ThreatLevelData.setForeground(Color.YELLOW); } else if ((threatLevelEnd > TEST2 ) && (threatLevelEnd < TEST3)){ ThreatLevelData.setText("SEVERE"); ThreatLevelData.setForeground(severeColor); } else if (threatLevelEnd > 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); } }
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3 answers

Go to window → Show view → general → Problems, and you will see a list of errors. In my case, I had the wrong source folder in the build path. Configuring the build path solves the "Error exists in your project" problem. In the "problems" view - click on the "error" and "quickly fix" buttons - this solved the problem.

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It could be a JRE bug. Right-click the project root and select preferences. Come to the installed JREs and look for an error. Also, rebuild the project and check Window > Show View > Error Log , as suggested in the comment from @Ted Hopp.

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Go to window → Show View → general → Problems, and you will see a list of errors. In my case, some JAR files were missing from the build path. Configuring the build path solves the "Error exists in your project" problem. In the problems view, right-click on the error and the quick fix.

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Source: https://habr.com/ru/post/949688/

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