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

protected final static String GOTO_PAGE = "goto_page";
	protected final static String TIP_PAGE = "/admin/tip";
	protected void  tip(RequestContext ctx,String message) {
		try {
			ctx.redirect(ctx.param(GOTO_PAGE, TIP_PAGE), message);
		} catch (IOException e) {
			 throw new ActionException(e);
		}
	}

我在action处理之后，还有一个统一的处理

但如果在action中就redirect的话，就会导致在统一处理的地方报

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

统一对 action 的代码在：

String gp = req.param(GOTO_PAGE);
                if(StringUtils.isNotBlank(gp)){
                    int show=req.param(SHOW, 1);
                    if(show>0){
                        String message = URLEncoder.encode(req.text(BltScript.SUCCESS), UTF_8);
                        gp=gp+"?message="+message;
                    }
                     req.redirect(gp);
                }