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List<String> errorMsgs = new LinkedList<String>();
req.setAttribute("errorMsgs", errorMsgs);
errorMsgs.add("不可空白！");
errorMsgs.add("密碼有誤！");
RequestDispatcher failureView = req.getRequestDispatcher("/join.jsp");
failureView.forward(req, res); 

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let jsReqErrMsgs = "${requestScope.errorMsgs}";
console.log(jsReqErrMsgs);

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let jsReqErrMsgs = "${requestScope.errorMsgs}";
console.log(jsReqErrMsgs);