Program: 67082
Project: 67082
Buggy source:
/** 
 * Executes the Command. This method should not be called if the Command is not executable.
 */
public void execute(){
  DesignElementHandle newObject=getNewObject();
  if (DesignerConstants.TRACING_COMMANDS) {
    System.out.println("String_Node_Str");
  }
  try {
    if (parent instanceof SlotHandle) {
      if (after != null) {
        int pos=DEUtil.findInsertPosition(((SlotHandle)parent).getElementHandle(),(DesignElementHandle)after,((SlotHandle)parent).getSlotID());
        ((SlotHandle)parent).add(newObject,pos);
      }
 else {
        ((SlotHandle)parent).add(newObject);
      }
    }
 else     if (newObject instanceof DataSourceHandle) {
      ((DesignElementHandle)parent).addElement(newObject,ReportDesignHandle.DATA_SOURCE_SLOT);
    }
 else     if (newObject instanceof MasterPageHandle) {
      ((DesignElementHandle)parent).addElement(newObject,ReportDesignHandle.PAGE_SLOT);
      ReportRequest r=new ReportRequest();
      r.setType(ReportRequest.SELECTION);
      List selection=new ArrayList();
      selection.add(newObject);
      r.setSelectionObject(selection);
      SessionHandleAdapter.getInstance().getMediator().notifyRequest(r);
      r=new ReportRequest();
      r.setType(ReportRequest.OPEN_EDITOR);
      r.setSelectionObject(selection);
      SessionHandleAdapter.getInstance().getMediator().notifyRequest(r);
    }
 else     if (DEUtil.getDefaultSlotID(parent) != -1) {
      if (after != null) {
        int pos=DEUtil.findInsertPosition((DesignElementHandle)parent,(DesignElementHandle)after);
        int slotID=DEUtil.findSlotID(parent,after);
        ((DesignElementHandle)parent).addElement(newObject,slotID,pos);
      }
 else {
        ((DesignElementHandle)parent).addElement(newObject,DEUtil.getDefaultSlotID(parent));
      }
    }
 else     if (DEUtil.getDefaultSlotID(parent) == -1) {
      if (after != null) {
        int pos=DEUtil.findInsertPosition((DesignElementHandle)parent,(DesignElementHandle)after,DEUtil.getDefaultContentName(parent));
        ((DesignElementHandle)parent).add(DEUtil.getDefaultContentName(parent),newObject,pos);
      }
 else {
        ((DesignElementHandle)parent).add(DEUtil.getDefaultContentName(parent),newObject);
      }
    }
    if (DesignerConstants.TRACING_COMMANDS) {
      System.out.println("String_Node_Str" + DEUtil.getDisplayLabel(newObject) + "String_Node_Str");
    }
  }
 catch (  SemanticException e) {
    if (DesignerConstants.TRACING_COMMANDS) {
      System.out.println("String_Node_Str");
    }
    logger.log(Level.SEVERE,e.getMessage(),e);
  }
}

Fixed version (ground truth):
/** 
 * Executes the Command. This method should not be called if the Command is not executable.
 */
public void execute(){
  DesignElementHandle newObject=getNewObject();
  if (DesignerConstants.TRACING_COMMANDS) {
    System.out.println("String_Node_Str");
  }
  try {
    if (parent instanceof SlotHandle) {
      if (after != null) {
        int pos=DEUtil.findInsertPosition(((SlotHandle)parent).getElementHandle(),(DesignElementHandle)after,((SlotHandle)parent).getSlotID());
        ((SlotHandle)parent).add(newObject,pos);
      }
 else {
        ((SlotHandle)parent).add(newObject);
      }
    }
 else     if (newObject instanceof DataSourceHandle) {
      ((DesignElementHandle)parent).addElement(newObject,ReportDesignHandle.DATA_SOURCE_SLOT);
    }
 else     if (newObject instanceof MasterPageHandle) {
      ((DesignElementHandle)parent).addElement(newObject,ReportDesignHandle.PAGE_SLOT);
      ReportRequest r=new ReportRequest();
      r.setType(ReportRequest.SELECTION);
      List selection=new ArrayList();
      selection.add(newObject);
      r.setSelectionObject(selection);
      SessionHandleAdapter.getInstance().getMediator().notifyRequest(r);
      r=new ReportRequest();
      r.setType(ReportRequest.OPEN_EDITOR);
      r.setSelectionObject(selection);
      SessionHandleAdapter.getInstance().getMediator().notifyRequest(r);
    }
 else     if (parent instanceof CellHandle && newObject instanceof TableGroupHandle) {
      DesignElementHandle cellHandle=(CellHandle)parent;
      TableHandle tableHandle=null;
      while (cellHandle.getContainer() != null) {
        cellHandle=cellHandle.getContainer();
        if (cellHandle instanceof TableHandle) {
          tableHandle=(TableHandle)cellHandle;
          break;
        }
      }
      if (tableHandle != null) {
        tableHandle.getGroups().add(newObject,tableHandle.getGroups().getCount());
      }
    }
 else     if (DEUtil.getDefaultSlotID(parent) != -1) {
      if (after != null) {
        int pos=DEUtil.findInsertPosition((DesignElementHandle)parent,(DesignElementHandle)after);
        int slotID=DEUtil.findSlotID(parent,after);
        ((DesignElementHandle)parent).addElement(newObject,slotID,pos);
      }
 else {
        ((DesignElementHandle)parent).addElement(newObject,DEUtil.getDefaultSlotID(parent));
      }
    }
 else     if (DEUtil.getDefaultSlotID(parent) == -1) {
      if (after != null) {
        int pos=DEUtil.findInsertPosition((DesignElementHandle)parent,(DesignElementHandle)after,DEUtil.getDefaultContentName(parent));
        ((DesignElementHandle)parent).add(DEUtil.getDefaultContentName(parent),newObject,pos);
      }
 else {
        ((DesignElementHandle)parent).add(DEUtil.getDefaultContentName(parent),newObject);
      }
    }
    if (DesignerConstants.TRACING_COMMANDS) {
      System.out.println("String_Node_Str" + DEUtil.getDisplayLabel(newObject) + "String_Node_Str");
    }
  }
 catch (  SemanticException e) {
    if (DesignerConstants.TRACING_COMMANDS) {
      System.out.println("String_Node_Str");
    }
    logger.log(Level.SEVERE,e.getMessage(),e);
  }
}