Program: 75573
Project: 75573
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 (after != null) {
        int pos=DEUtil.findInsertPosition((DesignElementHandle)parent,(DesignElementHandle)after);
        int slotID=DEUtil.findSlotID(parent,after);
        ((DesignElementHandle)parent).addElement(newObject,slotID,pos);
      }
 else       if (DEUtil.getDefaultSlotID(parent) != -1) {
        ((DesignElementHandle)parent).addElement(newObject,DEUtil.getDefaultSlotID(parent));
      }
 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");
    }
    e.printStackTrace();
  }
}

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 (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");
    }
    e.printStackTrace();
  }
}