Program: 62506
Project: 62506
Buggy source:
public JPanel createMainPanel(){
  GridBagLayout layout=new GridBagLayout();
  layout.columnWidths=new int[]{100,390};
  mainPanel=new JPanel(layout);
  container=PropertyContainer.createObjectBacked(parameter);
  context=new BindingContext(container);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getName(),0,true);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getAlias(),1,true);
  mainPanel.add(new JLabel("String_Node_Str"),getConstraints(2,0,1));
  JComboBox comboEditor=new JComboBox(typesMap.keySet().toArray());
  comboEditor.setSelectedItem(typesMap.getKey(parameter.getDataType()));
  comboEditor.addActionListener(e -> {
    JComboBox cb=(JComboBox)e.getSource();
    String typeName=(String)cb.getSelectedItem();
    if (!parameter.getDataType().equals((Class<?>)typesMap.get(typeName))) {
      parameter.setDataType((Class<?>)typesMap.get(typeName));
      try {
        if (editorComponent != null) {
          mainPanel.remove(editorComponent);
        }
        editorComponent=uiWrapper.reloadUIComponent((Class<?>)typesMap.get(typeName));
        if (!("String_Node_Str".equals(typeName) || "String_Node_Str".equals(typeName))) {
          editorComponent.setInputVerifier(new TypedValueValidator("String_Node_Str",parameter.getDataType()));
        }
        mainPanel.add(editorComponent,getConstraints(3,1,1));
        mainPanel.revalidate();
      }
 catch (      Exception e1) {
        e1.printStackTrace();
      }
    }
  }
);
  mainPanel.add(comboEditor,getConstraints(2,1,1));
  mainPanel.add(new JLabel("String_Node_Str"),getConstraints(3,0,1));
  try {
    editorComponent=uiWrapper.getUIComponent();
    mainPanel.add(editorComponent,getConstraints(3,1,1));
  }
 catch (  Exception e) {
    e.printStackTrace();
  }
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getDescription(),4,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getLabel(),5,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getUnit(),6,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getInterval(),7,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",StringUtils.join(parameter.getValueSet(),"String_Node_Str"),8,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getCondition(),9,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getPattern(),10,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getFormat(),11,false);
  addBoolPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.isNotNull(),12);
  addBoolPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.isNotEmpty(),13);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getItemAlias(),14,false);
  addBoolPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.isDeprecated(),15);
  return mainPanel;
}

Fixed version (ground truth):
public JPanel createMainPanel(){
  GridBagLayout layout=new GridBagLayout();
  layout.columnWidths=new int[]{100,390};
  mainPanel=new JPanel(layout);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getName(),0,true);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getAlias(),1,true);
  mainPanel.add(new JLabel("String_Node_Str"),getConstraints(2,0,1));
  JComboBox comboEditor=new JComboBox(typesMap.keySet().toArray());
  comboEditor.setSelectedItem(typesMap.getKey(parameter.getDataType()));
  comboEditor.addActionListener(ev -> {
    JComboBox cb=(JComboBox)ev.getSource();
    String typeName=(String)cb.getSelectedItem();
    if (!parameter.getDataType().equals((Class<?>)typesMap.get(typeName))) {
      parameter.setDataType((Class<?>)typesMap.get(typeName));
      parameter.setValueSet(null);
      paramContext.getPropertySet().getProperty(parameter.getName()).getDescriptor().setValueSet(null);
      try {
        valuesContext.getPropertySet().getProperty("String_Node_Str").setValue(null);
      }
 catch (      ValidationException e) {
        logger.warning(e.getMessage());
      }
      try {
        if (editorComponent != null) {
          mainPanel.remove(editorComponent);
        }
        editorComponent=uiWrapper.reloadUIComponent((Class<?>)typesMap.get(typeName));
        if (!("String_Node_Str".equals(typeName) || "String_Node_Str".equals(typeName))) {
          editorComponent.setInputVerifier(new TypedValueValidator("String_Node_Str",parameter.getDataType()));
        }
        mainPanel.add(editorComponent,getConstraints(3,1,1));
        mainPanel.revalidate();
      }
 catch (      Exception e) {
        logger.warning(e.getMessage());
        SnapDialogs.showError(e.getMessage());
      }
    }
  }
);
  mainPanel.add(comboEditor,getConstraints(2,1,1));
  mainPanel.add(new JLabel("String_Node_Str"),getConstraints(3,0,1));
  try {
    editorComponent=uiWrapper.getUIComponent();
    mainPanel.add(editorComponent,getConstraints(3,1,1));
  }
 catch (  Exception e) {
    e.printStackTrace();
  }
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getDescription(),4,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getLabel(),5,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getUnit(),6,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getInterval(),7,false);
  JComponent valueSetEditor=addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",StringUtils.join(parameter.getValueSet(),ArrayConverter.SEPARATOR),8,false);
  valueSetEditor.addFocusListener(new FocusListener(){
    @Override public void focusGained(    FocusEvent e){
    }
    @Override public void focusLost(    FocusEvent ev){
      try {
        String newValueSet=((JTextField)valueSetEditor).getText();
        if (newValueSet.isEmpty()) {
          parameter.setValueSet(null);
          valuesContext.getPropertySet().getProperty("String_Node_Str").setValue(null);
        }
 else {
          parameter.setValueSet(newValueSet.split(ArrayConverter.SEPARATOR));
          valuesContext.getPropertySet().getProperty("String_Node_Str").setValue(newValueSet.split(ArrayConverter.SEPARATOR));
        }
        if (editorComponent != null) {
          mainPanel.remove(editorComponent);
        }
        createContextForValueEditor();
        if (!(File.class.equals(parameter.getDataType()) || parameter.getDataType().isArray())) {
          editorComponent.setInputVerifier(new TypedValueValidator("String_Node_Str",parameter.getDataType()));
        }
        mainPanel.add(editorComponent,getConstraints(3,1,1));
        mainPanel.revalidate();
      }
 catch (      Exception e) {
        logger.warning(e.getMessage());
        SnapDialogs.showError(e.getMessage());
      }
    }
  }
);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getCondition(),9,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getPattern(),10,false);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getFormat(),11,false);
  addBoolPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.isNotNull(),12);
  addBoolPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.isNotEmpty(),13);
  addTextPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.getItemAlias(),14,false);
  addBoolPropertyEditor(mainPanel,"String_Node_Str","String_Node_Str",parameter.isDeprecated(),15);
  return mainPanel;
}