java.lang.IllegalStateException：Cannot forward after response has been committed

try {
    username = session.getAttribute("username").toString();
   } catch(NullPointerException ex) {
    request.getRequestDispatcher("LoginServlet").forward(request, response);
    
    return; // 务必注意要加上 return
   }

 

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1 楼 greatwqs 2011-02-25  

java.lang.IllegalStateException: Cannot forward after response has been committed