Servlet 에러 페이지 처리

400, 401, 404 ... 에러페이지 매핑

location 부분은 경로에 맞게 jsp 파일 생성해서 입력

web,xml

<error-page>
    <error-code>401</error-code>
    <location>/error/error.jsp</location>
</error-page>
<error-page>
    <error-code>403</error-code>
    <location>/error/error.jsp</location>
</error-page>
<error-page>
    <error-code>404</error-code>
    <location>/error/404error.jsp</location>
</error-page>
<error-page>
    <exception-type>java.lang.NullPointerException</exception-type>
    <location>/error/error.jsp</location>
</error-page>
<error-page>
    <exception-type>java.lang.Throwable</exception-type>
    <location>/error/error.jsp</location>
</error-page>
<error-page>
    <exception-type>java.lang.Exception</exception-type>
    <location>/error/error.jsp</location>
</error-page>

error,jsp

<%
    out.print("status_code : ");
    out.print(request.getAttribute("javax.servlet.error.status_code"));
    out.print("<br />");
    out.print("<br />");
    out.print("exception_type : ");
    out.print(request.getAttribute("javax.servlet.error.exception_type"));
    out.print("<br />");
    out.print("<br />");
    out.print("message : ");
    out.print(request.getAttribute("javax.servlet.error.message"));
    out.print("<br />");
    out.print("<br />");
    out.print("exception : ");
    out.print(request.getAttribute("javax.servlet.error.exception"));
    out.print("<br />");
    out.print("<br />");
    out.print("request_uri : ");
    out.print(request.getAttribute("javax.servlet.error.request_uri"));
%>