Cannot forward after response has been committed

Question

使用struts开发,遇到这种情况.
一般测试的时候没有出现,突然出现这个,有些莫名其妙!代码如下:
SubSysFunInterfaceForm sform = (SubSysFunInterfaceForm)form;
sform.setSearchType(null);
sform.setSearchValue(null);
ISubSysFunInterfaceBO issfi = (ISubSysFunInterfaceBO)BOFactory.getDAOInstance(ISubSysFunInterfaceBO.class,0);
try
{
SubSysFunInterfacePageProperty pp = issfi.getSubSysFunInterfaceProperty(1);
request.setAttribute("PageProperty", pp);
return mapping.findForward("ToPage");
}
catch(Exception e)
{
e.printStackTrace();
return mapping.findForward("DataBaseConnectionException");
}

Answer 1

补充一下,异常如下:
java.lang.IllegalStateException: Cannot forward after response has been committed
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.baoshan.filter.CharFilter.doFilter(CharFilter.java:67)

Answer 2

你的程序没有 return  ActionFoward 类型的值
  把上面的 2个return 语句去掉   把返回值用一个ActionFoward 类型的值接受
     然后返回就 OK了  

Answer 3

mapping.findForward返回的就是一个ActionForWard类型