Program: 21434
Project: 21434
Buggy source:
/** 
 * Das Menü wird hier initialisiert
 */
public void initMenuBar(){
  JMenu menFile=new JMenu(JDUtilities.getResourceString("String_Node_Str"));
  menFile.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  JMenuItem menFileLoadContainer=createMenuItem(actionLoadContainer);
  JMenuItem menFileLoad=createMenuItem(actionLoadDLC);
  JMenuItem menFileSave=createMenuItem(actionSaveDLC);
  JMenuItem menFileExit=createMenuItem(actionExit);
  JMenu menEdit=new JMenu(JDUtilities.getResourceString("String_Node_Str"));
  menFile.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  JMenuItem menEditItemTop=createMenuItem(actionItemsTop);
  JMenuItem menEditItemUp=createMenuItem(actionItemsUp);
  JMenuItem menEditItemDown=createMenuItem(actionItemsDown);
  JMenuItem menEditItemBottom=createMenuItem(actionItemsBottom);
  JMenuItem menEditItemsDelete=createMenuItem(actionItemsDelete);
  menEdit.add(menEditItemsDelete);
  menEdit.addSeparator();
  menEdit.add(menEditItemTop);
  menEdit.add(menEditItemUp);
  menEdit.add(menEditItemDown);
  menEdit.add(menEditItemBottom);
  JMenu menAction=new JMenu(JDUtilities.getResourceString("String_Node_Str"));
  menAction.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  JMenuItem menDownload=createMenuItem(actionStartStopDownload);
  JMenuItem menAddLinks=createMenuItem(actionItemsAdd);
  menAction.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  JMenu menExtra=new JMenu(JDUtilities.getResourceString("String_Node_Str"));
  menAction.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  menViewLog=new JCheckBoxMenuItem(actionLog);
  menViewLog.setIcon(null);
  if (actionLog.getAccelerator() != null)   menViewLog.setAccelerator(actionLog.getAccelerator());
  JMenuItem menConfig=createMenuItem(actionConfig);
  menFile.add(menFileLoadContainer);
  menFile.add(menFileLoad);
  menFile.add(menFileSave);
  menFile.addSeparator();
  menFile.add(menFileExit);
  menExtra.add(menViewLog);
  menExtra.add(menConfig);
  menAction.add(menDownload);
  menAction.add(menAddLinks);
  menuBar.add(menFile);
  menuBar.add(menEdit);
  menuBar.add(menAction);
  menuBar.add(menExtra);
  frame.setJMenuBar(menuBar);
}

Fixed version (ground truth):
/** 
 * Das Menü wird hier initialisiert
 */
public void initMenuBar(){
  JMenu menFile=new JMenu(JDUtilities.getResourceString("String_Node_Str"));
  menFile.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  JMenuItem menFileLoadContainer=createMenuItem(actionLoadContainer);
  JMenuItem menFileLoad=createMenuItem(actionLoadDLC);
  JMenuItem menFileSave=createMenuItem(actionSaveDLC);
  JMenuItem menFileExit=createMenuItem(actionExit);
  JMenu menEdit=new JMenu(JDUtilities.getResourceString("String_Node_Str"));
  menFile.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  JMenuItem menEditItemTop=createMenuItem(actionItemsTop);
  JMenuItem menEditItemUp=createMenuItem(actionItemsUp);
  JMenuItem menEditItemDown=createMenuItem(actionItemsDown);
  JMenuItem menEditItemBottom=createMenuItem(actionItemsBottom);
  JMenuItem menEditItemsDelete=createMenuItem(actionItemsDelete);
  menEdit.add(menEditItemsDelete);
  menEdit.addSeparator();
  menEdit.add(menEditItemTop);
  menEdit.add(menEditItemUp);
  menEdit.add(menEditItemDown);
  menEdit.add(menEditItemBottom);
  JMenu menAction=new JMenu(JDUtilities.getResourceString("String_Node_Str"));
  menAction.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  JMenuItem menDownload=createMenuItem(actionStartStopDownload);
  JMenuItem menAddLinks=createMenuItem(actionItemsAdd);
  menAction.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  JMenu menExtra=new JMenu(JDUtilities.getResourceString("String_Node_Str"));
  menAction.setMnemonic(JDUtilities.getResourceChar("String_Node_Str"));
  menViewLog=new JCheckBoxMenuItem(actionLog);
  menViewLog.setIcon(null);
  if (actionLog.getAccelerator() != null)   menViewLog.setAccelerator(actionLog.getAccelerator());
  JMenuItem menConfig=createMenuItem(actionConfig);
  JMenuItem menTester=createMenuItem(actionTester);
  menFile.add(menFileLoadContainer);
  menFile.add(menFileLoad);
  menFile.add(menFileSave);
  menFile.addSeparator();
  menFile.add(menFileExit);
  menExtra.add(menViewLog);
  menExtra.add(menTester);
  menExtra.add(menConfig);
  menAction.add(menDownload);
  menAction.add(menAddLinks);
  menuBar.add(menFile);
  menuBar.add(menEdit);
  menuBar.add(menAction);
  menuBar.add(menExtra);
  frame.setJMenuBar(menuBar);
}