Program: 121923
Project: 121923
Buggy source:
@Override protected void handleDrop(){
  updateTargetRequest();
  updateTargetEditPart();
  if (fromPalette && getTargetRequest() instanceof CreateRequest) {
    if (getTargetEditPart() instanceof ProcessPart) {
      Object newObject=((CreateRequest)getTargetRequest()).getNewObject();
      if (newObject != null) {
        Command command=getCommand();
        if (command != null) {
          execCommandStack(command);
        }
      }
      return;
    }
 else     if (selectedConnectionPart != null) {
      CreateRequest req=((CreateRequest)getTargetRequest());
      Object o=req.getNewObject();
      Point location=req.getLocation();
      if (o instanceof Node) {
        createComponentOnLink((Node)o,location);
      }
      return;
    }
 else     if (getTargetEditPart() instanceof JobletContainerPart) {
      JobletContainerPart jobletPart=(JobletContainerPart)getTargetEditPart();
      if (isLock(jobletPart)) {
        Shell shell=Display.getCurrent().getActiveShell();
        ChooseJobletDialog dialog=new ChooseJobletDialog(new Shell(shell),getDropLocation());
        if (dialog.open() == dialog.OK) {
          EditPart part=getTargetEditPart();
          if (dialog.addToJoblet()) {
            AbstractMultiPageTalendEditor openEditor=getJobletPart((JobletContainerPart)part);
            part=openEditor.getDesignerEditor().getProcessPart();
            setTargetEditPart(part);
            Object newObject=((CreateRequest)getTargetRequest()).getNewObject();
            if (newObject != null) {
              Command command=getCommand();
              if (command != null) {
                CommandStack commandStack=(CommandStack)openEditor.getAdapter(CommandStack.class);
                if (commandStack != null) {
                  commandStack.execute(command);
                }
 else {
                  command.execute();
                }
              }
            }
            return;
          }
 else {
            part=getParentPart(part);
            setTargetEditPart(part);
            Object newObject=((CreateRequest)getTargetRequest()).getNewObject();
            if (newObject != null) {
              Command command=getCommand();
              if (command != null) {
                execCommandStack(command);
              }
            }
            return;
          }
        }
      }
    }
  }
  if (GlobalServiceRegister.getDefault().isServiceRegistered(ICamelDesignerCoreService.class)) {
    ICamelDesignerCoreService camelService=(ICamelDesignerCoreService)GlobalServiceRegister.getDefault().getService(ICamelDesignerCoreService.class);
    if (getTargetEditPart().getModel() != null && (getTargetEditPart().getModel() instanceof Process) && camelService.isCamelMulitPageEditor(((Process)getTargetEditPart().getModel()).getEditor())) {
      return;
    }
  }
  List<Object> sources=getSelectSource();
  if (containsContextSource(sources)) {
    createContext(sources);
  }
 else {
    if (!(getTargetEditPart() instanceof NodeContainerPart)) {
      try {
        createNewComponent(getCurrentEvent());
      }
 catch (      OperationCanceledException e) {
        return;
      }
    }
 else {
      if (containsSQLPatternSource(sources)) {
        createSQLPattern(sources);
      }
 else {
        createSchema(getSelection().getFirstElement(),getTargetEditPart());
        createQuery(getSelection().getFirstElement(),getTargetEditPart());
        createProperty(getSelection().getFirstElement(),getTargetEditPart());
        createChildJob(getSelection().getFirstElement(),getTargetEditPart());
        createValidationRule(getSelection().getFirstElement(),getTargetEditPart());
      }
    }
  }
  if (editor.isDirty()) {
    editor.setFocus();
  }
  this.eraseTargetFeedback();
}

Fixed version (ground truth):
@Override protected void handleDrop(){
  updateTargetRequest();
  updateTargetEditPart();
  if (fromPalette && getTargetRequest() instanceof CreateRequest) {
    if (selectedConnectionPart != null) {
      CreateRequest req=((CreateRequest)getTargetRequest());
      Object o=req.getNewObject();
      Point location=req.getLocation();
      if (o instanceof Node) {
        createComponentOnLink((Node)o,location);
      }
      return;
    }
 else     if (getTargetEditPart() instanceof ProcessPart) {
      Object newObject=((CreateRequest)getTargetRequest()).getNewObject();
      if (newObject != null) {
        Command command=getCommand();
        if (command != null) {
          execCommandStack(command);
        }
      }
      return;
    }
 else     if (getTargetEditPart() instanceof JobletContainerPart) {
      JobletContainerPart jobletPart=(JobletContainerPart)getTargetEditPart();
      if (isLock(jobletPart)) {
        Shell shell=Display.getCurrent().getActiveShell();
        ChooseJobletDialog dialog=new ChooseJobletDialog(new Shell(shell),getDropLocation());
        if (dialog.open() == dialog.OK) {
          EditPart part=getTargetEditPart();
          if (dialog.addToJoblet()) {
            AbstractMultiPageTalendEditor openEditor=getJobletPart((JobletContainerPart)part);
            part=openEditor.getDesignerEditor().getProcessPart();
            setTargetEditPart(part);
            Object newObject=((CreateRequest)getTargetRequest()).getNewObject();
            if (newObject != null) {
              Command command=getCommand();
              if (command != null) {
                CommandStack commandStack=(CommandStack)openEditor.getAdapter(CommandStack.class);
                if (commandStack != null) {
                  commandStack.execute(command);
                }
 else {
                  command.execute();
                }
              }
            }
            return;
          }
 else {
            part=getParentPart(part);
            setTargetEditPart(part);
            Object newObject=((CreateRequest)getTargetRequest()).getNewObject();
            if (newObject != null) {
              Command command=getCommand();
              if (command != null) {
                execCommandStack(command);
              }
            }
            return;
          }
        }
      }
    }
  }
  if (GlobalServiceRegister.getDefault().isServiceRegistered(ICamelDesignerCoreService.class)) {
    ICamelDesignerCoreService camelService=(ICamelDesignerCoreService)GlobalServiceRegister.getDefault().getService(ICamelDesignerCoreService.class);
    if (getTargetEditPart().getModel() != null && (getTargetEditPart().getModel() instanceof Process) && camelService.isCamelMulitPageEditor(((Process)getTargetEditPart().getModel()).getEditor())) {
      return;
    }
  }
  List<Object> sources=getSelectSource();
  if (containsContextSource(sources)) {
    createContext(sources);
  }
 else {
    if (!(getTargetEditPart() instanceof NodeContainerPart)) {
      try {
        createNewComponent(getCurrentEvent());
      }
 catch (      OperationCanceledException e) {
        return;
      }
    }
 else {
      if (containsSQLPatternSource(sources)) {
        createSQLPattern(sources);
      }
 else {
        createSchema(getSelection().getFirstElement(),getTargetEditPart());
        createQuery(getSelection().getFirstElement(),getTargetEditPart());
        createProperty(getSelection().getFirstElement(),getTargetEditPart());
        createChildJob(getSelection().getFirstElement(),getTargetEditPart());
        createValidationRule(getSelection().getFirstElement(),getTargetEditPart());
      }
    }
  }
  if (editor.isDirty()) {
    editor.setFocus();
  }
  this.eraseTargetFeedback();
}