jsp 500에러 (3일간 해결못하고 있는데 도와주세요..)

Question

게시판 구현 중인 초보 개발자 지망생입니다.. 게시판 글쓰기를 하고 DB로 보내는 것 까지는 다 되는데, 완료 후 페이지가 넘어가지 않고 500에러가 뜨면서 아래와 같은 메시지가 뜨네요.. 아래 글쓰기 commend에서 성공까지 콘솔창에 뜨는데 url 부분에서 경로를 못찾는것같은데.. 구글링을해도 답이 잘 안나오네요..ㅜ 도와 주시면 감사하겠습니다..ㅜㅜ 1월 27, 2018 4:03:42 오후 org.apache.catalina.core.ApplicationDispatcher invoke심각: Servlet.service() for servlet [jsp] threw exceptionjava.lang.NullPointerException at org.apache.jsp.boardNoticeListView_jsp._jspService(boardNoticeListView_jsp.java:157) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:467) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:392) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:311) at com.ksc.DBBoardController.DBBoardController.doGet(DBBoardController.java:63) at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Unknown Source) 1월 27, 2018 4:03:42 오후 org.apache.catalina.core.StandardWrapperValve invoke심각: Servlet.service() for servlet [com.ksc.DBBoardController.DBBoardController] in context with path [/Haribo] threw exception [java.lang.NullPointerException] with root causejava.lang.NullPointerException at org.apache.jsp.boardNoticeListView_jsp._jspService(boardNoticeListView_jsp.java:157) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:467) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:392) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:311) at com.ksc.DBBoardController.DBBoardController.doGet(DBBoardController.java:63) at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Unknown Source) <JAVA 글쓰기 커멘드> package com.ksc.DBBoardCommend; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.ksc.DBBoardDAO.DBBoardDAO; public class ActionBoardNoticeWrite implements ActionQueryCommend{ &#64;Override public void excuteQueryCommend(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println(&#34;게시판 공지사항 글쓰기 commend&#34;); String userId&#61;request.getParameter(&#34;userId&#34;); String bTitle&#61;request.getParameter(&#34;bTitle&#34;); String bContent&#61;request.getParameter(&#34;bContent&#34;); System.out.println(userId); System.out.println(bTitle); System.out.println(bContent); DBBoardDAO dao&#61;DBBoardDAO.getInstance(); int num&#61;dao.boardNoticeWriteDo(userId, bTitle, bContent); String url&#61;&#34;&#34;; if (num&#61;&#61;1) { System.out.println(&#34;게시판 글쓰기 성공&#34;); url&#61;&#34;/boardNoticeListView.bo&#34;; } else { System.out.println(&#34;게시판 글쓰기 실패&#34;); url&#61;&#34;/boardNoticeWrite.jsp&#34;; } request.setAttribute(&#34;url&#34;, url); } }

제타건담 · Accepted Answer

at com.ksc.DBBoardController.DBBoardController.doGet(DBBoardController.java:63) 에러 발생의 시작점은 여기네요..여기부터 살펴보세요

뉴비개발자 · Answer

boardNoticeListView_jsp.java:157 여기 클릭 하셔서 가보면 null값인 클래스를 통해 메서드롤 호출하는 부분이 있을겁니다. 막든가 클래스 받는부분 수정하시면 되요.

초행인 · Answer

클릭했는데, 'Source not found for org.apache.jsp.boardNoticeListView_jsp' 라고 경고창이 뜨네요ㅠ 혹시몰라 네트워크 창 스샷도 첨부합니다..!

초행인 · Answer

제타건담 님 감사합니다.controller 에서 구문이 틀린 부분은 없었는데 class 네임이 노란줄로 warning 이 계속 떠있었는데 실행에는 문제가 없었거든요. 혹시 이게 문제인가 싶어서 serialVersionUID 를 추가 했더니 이제 제대로 됩니다ㅜ 힌트가 되었네요 감사합니다!

jsp 500에러 (3일간 해결못하고 있는데 도와주세요..)

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