Program: 21335
Project: 21335
Buggy source:
@Override public void initPanel(){
  setLayout(new BorderLayout(10,10));
  table=new JTable();
  InternalTableModel internalTableModel=new InternalTableModel();
  table.setModel(new InternalTableModel());
  TableColumn column=null;
  for (int c=0; c < internalTableModel.getColumnCount(); c++) {
    column=table.getColumnModel().getColumn(c);
switch (c) {
case 0:
      column.setPreferredWidth(30);
    break;
case 1:
  column.setPreferredWidth(70);
break;
case 2:
column.setPreferredWidth(600);
break;
}
}
table.addMouseListener(this);
JScrollPane scrollpane=new JScrollPane(table);
scrollpane.setPreferredSize(new Dimension(400,200));
btnEdit=new JButton(JDLocale.L("String_Node_Str","String_Node_Str"));
btnEdit.setEnabled(false);
table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
public void valueChanged(ListSelectionEvent e){
if (plugins.get(((DefaultListSelectionModel)e.getSource()).getMinSelectionIndex()).getConfig().getEntries().size() != 0) btnEdit.setEnabled(true);
 else btnEdit.setEnabled(false);
}
}
);
btnEdit.addActionListener(this);
enableDisable=new JButton(JDLocale.L("String_Node_Str","String_Node_Str"));
enableDisable.addActionListener(this);
openPluginDir=new JButton(JDLocale.L("String_Node_Str","String_Node_Str"));
openPluginDir.addActionListener(this);
link=new JLinkButton(JDLocale.L("String_Node_Str","String_Node_Str"),JDLocale.L("String_Node_Str","String_Node_Str"));
JPanel contentPanel=new JPanel(new BorderLayout(5,5));
int n=5;
contentPanel.setBorder(new EmptyBorder(0,n,0,n));
String text=JDLocale.L("String_Node_Str","String_Node_Str");
contentPanel.add(new JLabel(text),BorderLayout.NORTH);
contentPanel.add(scrollpane,BorderLayout.CENTER);
JPanel buttonPanel=new JPanel(new FlowLayout(5,5,FlowLayout.LEFT));
buttonPanel.add(btnEdit);
buttonPanel.add(enableDisable);
buttonPanel.add(openPluginDir);
buttonPanel.add(link);
add(contentPanel,BorderLayout.CENTER);
add(buttonPanel,BorderLayout.SOUTH);
}

Fixed version (ground truth):
@Override public void initPanel(){
  setLayout(new BorderLayout(10,10));
  table=new JTable();
  InternalTableModel internalTableModel=new InternalTableModel();
  table.setModel(new InternalTableModel());
  TableColumn column=null;
  for (int c=0; c < internalTableModel.getColumnCount(); c++) {
    column=table.getColumnModel().getColumn(c);
switch (c) {
case 0:
      column.setPreferredWidth(70);
    break;
case 1:
  column.setPreferredWidth(300);
break;
}
}
table.addMouseListener(this);
JScrollPane scrollpane=new JScrollPane(table);
scrollpane.setPreferredSize(new Dimension(400,200));
btnEdit=new JButton(JDLocale.L("String_Node_Str","String_Node_Str"));
btnEdit.setEnabled(false);
table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
public void valueChanged(ListSelectionEvent e){
if ((((DefaultListSelectionModel)e.getSource()).getMinSelectionIndex() != -1) && (plugins.get(((DefaultListSelectionModel)e.getSource()).getMinSelectionIndex()).getConfig().getEntries().size() != 0)) btnEdit.setEnabled(true);
 else btnEdit.setEnabled(false);
}
}
);
btnEdit.addActionListener(this);
enableDisable=new JButton(JDLocale.L("String_Node_Str","String_Node_Str"));
enableDisable.addActionListener(this);
openPluginDir=new JButton(JDLocale.L("String_Node_Str","String_Node_Str"));
openPluginDir.addActionListener(this);
link=new JLinkButton(JDLocale.L("String_Node_Str","String_Node_Str"),JDLocale.L("String_Node_Str","String_Node_Str"));
JPanel contentPanel=new JPanel(new BorderLayout(5,5));
int n=5;
contentPanel.setBorder(new EmptyBorder(0,n,0,n));
String text=JDLocale.L("String_Node_Str","String_Node_Str");
contentPanel.add(new JLabel(text),BorderLayout.NORTH);
contentPanel.add(scrollpane,BorderLayout.CENTER);
JPanel buttonPanel=new JPanel(new FlowLayout(5,5,FlowLayout.LEFT));
buttonPanel.add(btnEdit);
buttonPanel.add(enableDisable);
buttonPanel.add(openPluginDir);
buttonPanel.add(link);
add(contentPanel,BorderLayout.CENTER);
add(buttonPanel,BorderLayout.SOUTH);
}