how to fix Cannot call sendRedirect after the response has been committed

Question

I am trying to pass values from servlet to jsp page using the code below     public void doPost HttpServletRequest request  HttpServletResponse response  throws ServletException  IOException        PrintWriter out   response getWriter        try           System out println  try             String taskid request getParameter  id               convty   new Connectivity            con   convty setConnection            st con createStatement             query  select   from task table            rset convty getResultSet query  con           while rset next                  System out println  while                lst add rset getString  task id                 lst add rset getString  date                 lst add rset getString  project name                           rset close            System out println  after while           catch Exception e             RequestDispatcher dd  request getRequestDispatcher  error jsp            dd forward request  response          finally           System out println  finally1            HttpSession sessionvar   request getSession            sessionvar setAttribute  TaskData    lst             response sendRedirect  usertaskpage jsp             lst clear            out close                          when I run my page I am getting   Error    java lang IllegalStateException  Cannot call sendRedirect   after the response has been committed     org apache catalina connector ResponseFacade sendRedirect ResponseFacade java 483      src Taskservlet doPost Taskservlet java 108      javax servlet http HttpServlet service HttpServlet java 647      javax servlet http HttpServlet service HttpServlet java 728      org apache tomcat websocket server WsFilter doFilter WsFilter java 51    I tried to use    RequestDispatcher dd request getRequestDispatcher  usertaskpage jsp    dd forward request  response     but I got the same error   How to fix this error

User · Answer

you can t call sendRedirect    after you have already used forward    So  you get that exception

User · Answer

you have already forwarded the response in catch block   RequestDispatcher dd   request getRequestDispatcher  error jsp     dd forward request  response     so  you can not again call the    response sendRedirect  usertaskpage jsp      because it is already forwarded  committed    So what you can do is  keep a string to assign where you need to forward the response       String page           try          catch  Exception e          page    error jsp         finally         page    usertaskpage jsp          RequestDispatcher dd request getRequestDispatcher page   dd forward request  response

User · Answer

The root cause of IllegalStateException exception is a java servlet is attempting to write to the output stream  response  after the response has been committed   It is always better to ensure that no content is added to the response after the forward or redirect is done to avoid IllegalStateException  It can be done by including a    return    statement immediately next to the forward or redirect statement   JAVA 7 OFFICIAL LINK   ADDITIONAL INFO

[java] how to fix Cannot call sendRedirect() after the response has been committed?

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