Program: 9859
Project: 9859
Buggy source:
/** 
 * When a Button is pressed this method select the right.
 * @param z ActionEvent
 */
public void actionPerformed(ActionEvent z){
  if (z.getActionCommand().equals("String_Node_Str") || z.getActionCommand().equals("String_Node_Str")) {
    model.setKnowledgeSource();
    view.getSuggestClassPanel().getSuggestModel().clear();
    view.getSuggestClassPanel().repaint();
    model.setLearningProblem();
    model.setLearningAlgorithm();
    view.getRunButton().setEnabled(false);
    view.getHintPanel().setForeground(Color.RED);
    CELOE celoe=(CELOE)model.getLearningAlgorithm();
    String moreInformationsMessage="String_Node_Str" + celoe.getMinimumHorizontalExpansion() + "String_Node_Str"+ celoe.getMaximumHorizontalExpansion()+ "String_Node_Str";
    view.setHelpButtonVisible(true);
    view.setHintMessage(moreInformationsMessage);
    retriever=new SuggestionRetriever();
    retriever.addPropertyChangeListener(view.getStatusBar());
    retriever.execute();
  }
  if (z.getActionCommand().equals("String_Node_Str")) {
    if (evaluatedDescription != null) {
      model.changeDLLearnerDescriptionsToOWLDescriptions(evaluatedDescription.getDescription());
    }
 else {
      model.changeDLLearnerDescriptionsToOWLDescriptions((Description)view.getSuggestClassPanel().getSuggestList().getSelectedValue());
    }
    String message="String_Node_Str";
    view.setHintMessage(message);
    view.setHelpButtonVisible(false);
  }
  if (z.toString().contains(ADVANCED_BUTTON_STRING)) {
    if (!toggled) {
      toggled=true;
      view.setIconToggled(toggled);
      view.setExamplePanelVisible(toggled);
    }
 else {
      toggled=false;
      view.setIconToggled(toggled);
      view.setExamplePanelVisible(toggled);
    }
  }
  if (z.toString().contains(HELP_BUTTON_STRING)) {
    String helpText="String_Node_Str" + "String_Node_Str" + "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str";
    help=new JTextArea();
    help.setEditable(false);
    help.setForeground(Color.black);
    help.setText(helpText);
    JOptionPane.showMessageDialog(null,help,"String_Node_Str",JOptionPane.INFORMATION_MESSAGE);
  }
}

Fixed version (ground truth):
/** 
 * When a Button is pressed this method select the right.
 * @param z ActionEvent
 */
public void actionPerformed(ActionEvent z){
  if (z.getActionCommand().equals(EQUIVALENT_CLASS_LEARNING_STRING) || z.getActionCommand().equals(SUPER_CLASS_LEARNING_STRING)) {
    model.setKnowledgeSource();
    view.getSuggestClassPanel().getSuggestModel().clear();
    view.getSuggestClassPanel().repaint();
    model.setLearningProblem();
    model.setLearningAlgorithm();
    view.getRunButton().setEnabled(false);
    view.getHintPanel().setForeground(Color.RED);
    CELOE celoe=(CELOE)model.getLearningAlgorithm();
    String moreInformationsMessage="String_Node_Str" + celoe.getMinimumHorizontalExpansion() + "String_Node_Str"+ celoe.getMaximumHorizontalExpansion()+ "String_Node_Str";
    view.setHelpButtonVisible(true);
    view.setHintMessage(moreInformationsMessage);
    retriever=new SuggestionRetriever();
    retriever.addPropertyChangeListener(view.getStatusBar());
    retriever.execute();
  }
  if (z.getActionCommand().equals(ADD_BUTTON_STRING)) {
    if (evaluatedDescription != null) {
      model.changeDLLearnerDescriptionsToOWLDescriptions(evaluatedDescription.getDescription());
    }
 else {
      model.changeDLLearnerDescriptionsToOWLDescriptions((Description)view.getSuggestClassPanel().getSuggestList().getSelectedValue());
    }
    String message="String_Node_Str";
    view.setHintMessage(message);
    view.setHelpButtonVisible(false);
  }
  if (z.toString().contains(ADVANCED_BUTTON_STRING)) {
    if (!toggled) {
      toggled=true;
      view.setIconToggled(toggled);
      view.setExamplePanelVisible(toggled);
    }
 else {
      toggled=false;
      view.setIconToggled(toggled);
      view.setExamplePanelVisible(toggled);
    }
  }
  if (z.toString().contains(HELP_BUTTON_STRING)) {
    String helpText="String_Node_Str" + "String_Node_Str" + "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str";
    help=new JTextArea();
    help.setEditable(false);
    help.setForeground(Color.black);
    help.setText(helpText);
    JOptionPane.showMessageDialog(null,help,"String_Node_Str",JOptionPane.INFORMATION_MESSAGE);
  }
}