tomcat发布后,报错org.apache.jasper.JasperException: java.lang.NullPointerException

本文解决了一个程序中出现的org.apache.jasper.JasperException:java.lang.NullPointerException问题,指出错误的原因在于WEB-INF/lib目录下的包与%TomcatHome%/lib中的包存在重复。
程序无错,却报org.apache.jasper.JasperException: java.lang.NullPointerException

解决:WEB-INF/lib下面的包 和 %Tomcat Home%/lib中有重复的包
HTTP Status 500 - java.lang.NullPointerException type Exception report message java.lang.NullPointerException description The server encountered an internal error that prevented it from fulfilling this request. exception org.apache.jasper.JasperException: java.lang.NullPointerException org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:561) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Servlet.UploadGameAccountServlet.doPost(UploadGameAccountServlet.java:63) javax.servlet.http.HttpServlet.service(HttpServlet.java:650) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) root cause java.lang.NullPointerException org.apache.jsp.MySpace_jsp._jspService(MySpace_jsp.java:122) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Servlet.UploadGameAccountServlet.doPost(UploadGameAccountServlet.java:63) javax.servlet.http.HttpServlet.service(HttpServlet.java:650) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.78 logs. Apache Tomcat/7.0.78
03-10
HTTP状态 500 - 内部服务器错误 类型 异常报告 消息 java.lang.NullPointerException: Cannot invoke "java.sql.Connection.prepareStatement(String)" because "conn" is null 描述 服务器遇到一个意外的情况,阻止它完成请求。 例外情况 org.apache.jasper.JasperException: java.lang.NullPointerException: Cannot invoke "java.sql.Connection.prepareStatement(String)" because "conn" is null org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:582) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:498) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:383) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:331) javax.servlet.http.HttpServlet.service(HttpServlet.java:583) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) 根本原因。 java.lang.NullPointerException: Cannot invoke "java.sql.Connection.prepareStatement(String)" because "conn" is null com.rain.dao.AdminDao.get_AidInfo2(AdminDao.java:314) org.apache.jsp.index_jsp._jspService(index_jsp.java:161) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:583) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:465) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:383) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:331) javax.servlet.http.HttpServlet.service(HttpServlet.java:583) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ):注意 主要问题的全部 stack 信息可以在 server logs 里查看 怎么解决
06-10
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