Cannot forward after response has been committed

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Cannot forward after response has been committed
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:349)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at servlet.check.doError(check.java:123)
at servlet.check.doGet(check.java:83)
at servlet.check.doPost(check.java:106)

**在servlet中出现跳转失败的错误**跳转方式一开始写为public void doError(HttpServletRequest request,HttpServletResponse response,String str)        throws ServletException,IOException{            request.setAttribute("problem", str);            RequestDispatcher rd=getServletContext().getRequestDispatcher("/errorpage.jsp");            rd.forward(request, response);}虽然正确但是会报错不知道为什么，但是加上return就不会出现错误现象改后正确的代码：public void doError(HttpServletRequest request,HttpServletResponse response,String str)        throws ServletException,IOException{            request.setAttribute("problem", str);            RequestDispatcher rd=getServletContext().getRequestDispatcher("/errorpage.jsp");        try{            rd.forward(request, response);            return ;        }catch(Exception e){}}

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