Program: 153261
Project: 153261
Buggy source:
public CraftProxyGUI(){
  pf=new MyPropertiesFile("String_Node_Str");
  pf.load();
  String defaultHostname=pf.getString("String_Node_Str","String_Node_Str");
  int defaultPort=pf.getInt("String_Node_Str",20000);
  int listenPort=pf.getInt("String_Node_Str",25565);
  setTitle("String_Node_Str");
  setSize(375,200);
  setLocation(40,150);
  topPanel.setLayout(new BorderLayout());
  secondPanel.setLayout(new BorderLayout());
  serverName=new JTextField(defaultHostname,20);
  TitledBorder border=new TitledBorder("String_Node_Str");
  serverName.setBorder(border);
  serverName.addActionListener(this);
  portNum=new JTextField(Integer.toString(defaultPort),6);
  border=new TitledBorder("String_Node_Str");
  portNum.setBorder(border);
  portNum.addActionListener(this);
  localServerName=new JLabel("String_Node_Str");
  border=new TitledBorder("String_Node_Str");
  localServerName.setBorder(border);
  localServerPortnum=new JTextField(Integer.toString(listenPort),6);
  border=new TitledBorder("String_Node_Str");
  localServerPortnum.setBorder(border);
  localServerPortnum.addActionListener(this);
  topPanel.add(serverName,BorderLayout.CENTER);
  topPanel.add(portNum,BorderLayout.LINE_END);
  secondPanel.setLayout(new BorderLayout());
  secondPanel.add(localServerName,BorderLayout.CENTER);
  secondPanel.add(localServerPortnum,BorderLayout.LINE_END);
  combinedTop.setLayout(new BorderLayout());
  combinedTop.add(topPanel,BorderLayout.CENTER);
  combinedTop.add(secondPanel,BorderLayout.SOUTH);
  info=new JLabel();
  border=new TitledBorder("String_Node_Str");
  info.setBorder(border);
  connect=new JButton(buttonText);
  connect.addActionListener(this);
  setLayout(new BorderLayout());
  add(combinedTop,BorderLayout.PAGE_START);
  add(info,BorderLayout.CENTER);
  add(connect,BorderLayout.PAGE_END);
  this.setResizable(false);
  setDefaultCloseOperation(DISPOSE_ON_CLOSE);
  this.addWindowListener(this);
}

Fixed version (ground truth):
public CraftProxyGUI(){
  pf=new MyPropertiesFile("String_Node_Str");
  pf.load();
  String defaultHostname=pf.getString("String_Node_Str","String_Node_Str");
  int defaultPort=pf.getInt("String_Node_Str",20000);
  int listenPort=pf.getInt("String_Node_Str",25565);
  setTitle("String_Node_Str");
  setSize(375,250);
  setLocation(40,150);
  topPanel.setLayout(new BorderLayout());
  topPanel.setBorder(new TitledBorder("String_Node_Str"));
  topPanel.setBackground(Color.WHITE);
  secondPanel.setLayout(new BorderLayout());
  secondPanel.setBorder(new TitledBorder("String_Node_Str"));
  secondPanel.setBackground(Color.WHITE);
  serverName=new JTextField(defaultHostname,20);
  TitledBorder border=new TitledBorder("String_Node_Str");
  serverName.setBorder(border);
  serverName.addActionListener(this);
  portNum=new JTextField(Integer.toString(defaultPort),6);
  border=new TitledBorder("String_Node_Str");
  portNum.setBorder(border);
  portNum.addActionListener(this);
  localServerName=new JLabel("String_Node_Str");
  localServerName.setBackground(Color.GRAY);
  border=new TitledBorder("String_Node_Str");
  localServerName.setBorder(border);
  localServerPortnum=new JTextField(Integer.toString(listenPort),6);
  border=new TitledBorder("String_Node_Str");
  localServerPortnum.setBorder(border);
  localServerPortnum.addActionListener(this);
  topPanel.add(serverName,BorderLayout.CENTER);
  topPanel.add(portNum,BorderLayout.LINE_END);
  secondPanel.setLayout(new BorderLayout());
  secondPanel.add(localServerName,BorderLayout.CENTER);
  secondPanel.add(localServerPortnum,BorderLayout.LINE_END);
  combinedTop.setLayout(new BorderLayout());
  combinedTop.add(topPanel,BorderLayout.CENTER);
  combinedTop.add(secondPanel,BorderLayout.SOUTH);
  info=new JLabel();
  border=new TitledBorder("String_Node_Str");
  info.setBorder(border);
  connect=new JButton(buttonText);
  connect.addActionListener(this);
  setLayout(new BorderLayout());
  add(combinedTop,BorderLayout.PAGE_START);
  add(info,BorderLayout.CENTER);
  add(connect,BorderLayout.PAGE_END);
  this.setResizable(false);
  setDefaultCloseOperation(DISPOSE_ON_CLOSE);
  this.addWindowListener(this);
}