request 跳转出现500状态码错误

[JieLum]

在用户名密码校验正确 根据response.sendRedirect(request.getContextPath());应该是跳转到WEB16(我的工程名) 那就自动访问我WebContent下的index.jsp才对 但是最后跳转的时候不是跳转到/WEB16 而是跳转到了/WEB16/login 下面是代码和web.xml

[JieLum]

下午 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [LoginServlet] in context with path [/WEB16] threw exception java.lang.NullPointerException at com.lmj.login.LoginServlet.doGet(LoginServlet.java:29) at com.lmj.login.LoginServlet.doPost(LoginServlet.java:69) at javax.servlet.http.HttpServlet.service(HttpServlet.java:646) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 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:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) 这里是报错信息

[爱学习的凉凉]

response.sendRedirect(request.getContextPath()+"/index.jsp"); 这样行吗?

[进击丶Saber]

小伙子,培训呢吧?debug学了吗?