1
에 "응답"에 접근을 시도하는 방법 :이 후사용자가 로그 아웃 할 때, 나는이 코드를 사용하여 로그인 쿠키를 삭제하고있어 NullPointerException이는 JSP 페이지에서 JSP
Cookie killMyCookie = new Cookie("cookie1", null);
killMyCookie.setMaxAge(0);
killMyCookie.setPath("/JSPLearn");
response.addCookie(killMyCookie);
killMyCookie = new Cookie("cookie2", null);
killMyCookie.setMaxAge(0);
killMyCookie.setPath("/JSPLearn");
response.addCookie(killMyCookie);
을, 나는
전화 해요response.sendRedirect("index.jsp");
NullPointerException을 발생시킵니다.
왜 응답이 null입니까?
스택 트레이스 :
java.lang.NullPointerException
at java.net.URLEncoder.encode(URLEncoder.java:205)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:175)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:403)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
JSP에 대해서는 잘 모르겠지만 .NET 환경에서는 쿠키를 설정 한 다음 즉각 리디렉션하면 쿠키가 실제로 설정되지 않습니다. 쿠키가 응답의 일부로 전송되어야하고 응답을 가로 채기 때문입니다. – mellamokb
전체 스택 추적을 게시 할 수 있습니까? – ControlAltDel
Stacktrace 게시판 – cd6