谷歌應用程序引擎modifyThreadGroup問題

我使用谷歌應用程序引擎來處理貝寶IPN的消息，當我的servlet開始我用下面的行啓動另一個進程來處理按摩：谷歌應用程序引擎modifyThreadGroup問題

public class PayPal_Monitor_Servlet extends HttpServlet 
{ 
    PayPal_Message_To_License_File_Worker PayPal_message_to_license_file_worker; 

    public void init(ServletConfig config) throws ServletException    // Initializes the servlet. 
    { 
    super.init(config); 
    PayPal_message_to_license_file_worker=new PayPal_Message_To_License_File_Worker(); 
    } 

    public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException 
    { 
    } 

... 
} 

public class PayPal_Message_To_License_File_Worker implements Runnable 
{ 
    static Thread PayPal_Message_To_License_File_Thread; 
... 

    PayPal_Message_To_License_File_Worker() 
    { 
    start(); 
    } 

    void start() 
    { 
    if (PayPal_Message_To_License_File_Thread==null) 
    { 
     PayPal_Message_To_License_File_Thread=new Thread(this); 
     PayPal_Message_To_License_File_Thread.setPriority(Thread.MIN_PRIORITY); 
     PayPal_Message_To_License_File_Thread.start(); 
    } 
... 
    }

但「PayPal_Message_To_License_File_Thread =新螺紋（本）;」導致以下錯誤：

javax.servlet.ServletContext log: unavailable 
java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup) 
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:355) 
    at java.security.AccessController.checkPermission(AccessController.java:567)

爲什麼，如何解決它？

Frank

來源

2010-04-25 Frank