Garbled characters happen when raw multibytes characters exist in POST request data with application/x-www-form-urlencoded content-type in JBoss EAP 7

Issue

A garbled character issue happens when a client application sends a POST request data with raw multibyte characters as application/x-www-form-urlencoded content-type to JBoss EAP 7. The same request does not face such a garbled character issue with JBoss EAP 6 or Tomcat.

example application:

...(snip)...
@WebServlet(name = "TestServlet", urlPatterns = {"/test"})
public class TestServlet extends HttpServlet {
    ...(snip)...

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
           out.println("test = " + request.getParameter("test"));
        }
    }

result:

• JBoss EAP 7:

$ curl http://localhost:8080/example/test -d "test=テスト"
test = ￣ﾃﾆ￣ﾂﾹ￣ﾃﾈ 

• JBoss EAP 6 and JWS 5 Tomcat 9

$ curl http://localhost:8080/example/test -d "test=テスト"
test = テスト