                        课程
                    
                        /后端开发
                        
                            /Java
                        
                        /JAVA遇见HTML——Servlet篇

空指针异常

和老师代码一样，为什么会报空指针异常。完全按照老师的步骤来的，一个字一个字的打

空指针异常null

2016-11-17

源自：JAVA遇见HTML——Servlet篇 1-11

关注问题我要回答

1500

操作

收起

5 回答

韶关hotel
2016-11-17

在servlet类中格式化birthday的时候有没有中文呀?不然我也不知道呢;没代码/流泪

0 回复有任何疑惑可以回复我~

收起回答

空指针异常null 提问者

唉，最后的问题是regServlet中保存到session时的键一个字母拼错了。。。所以跳转的时候传不过去数据

2016-11-18 回复有任何疑惑可以回复我~

黑山头山大王回复空指针异常null 提问者

keng

2016-11-25 回复有任何疑惑可以回复我~

空指针异常null 提问者回复黑山头山大王

哈哈哈哈，我也被自己坑到了。

2016-11-28 回复有任何疑惑可以回复我~

韶关hotel
2016-11-17

你js Floder添加有没有错误先?

0 回复有任何疑惑可以回复我~

收起回答

空指针异常null 提问者

js的路径吗？我是放在webroot文件夹下的js文件夹下面的

2016-11-17 回复有任何疑惑可以回复我~

黑山头山大王
2016-11-17

at servlet.RegServlet.doPost(RegServlet.java:111)

看一下这一行的代码

0 回复有任何疑惑可以回复我~

收起回答

空指针异常null 提问者

嗯，我明天看看，谢谢了

2016-11-17 回复有任何疑惑可以回复我~

黑山头山大王回复空指针异常null 提问者

不客气，我也是菜鸟来的。这么早就睡觉啦

2016-11-17 回复有任何疑惑可以回复我~

空指针异常null 提问者回复黑山头山大王

不是，是准备下班回家了。

2016-11-17 回复有任何疑惑可以回复我~

查看2条回复

空指针异常null 提问者
2016-11-17

十一月 17, 2016 8:56:50 下午 org.apache.catalina.startup.Catalina start

信息: Server startup in 4807 ms

asdf

asd

Male

asdf

Wed Nov 02 00:00:00 CST 2016

十一月 17, 2016 8:57:19 下午 org.apache.catalina.core.ApplicationDispatcher invoke

严重: Servlet.service() for servlet jsp threw exception

java.lang.NullPointerException

at java.util.Calendar.setTime(Calendar.java:1106)

at java.text.SimpleDateFormat.format(SimpleDateFormat.java:955)

at java.text.SimpleDateFormat.format(SimpleDateFormat.java:948)

at java.text.DateFormat.format(DateFormat.java:336)

at org.apache.jsp.userinfo_jsp._jspService(userinfo_jsp.java:168)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:747)

at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:485)

at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:410)

at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:337)

at servlet.RegServlet.doPost(RegServlet.java:111)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1083)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:640)

at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517)

at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:745)

org.apache.jasper.JasperException: java.lang.NullPointerException

at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:561)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)