类型 异常报告
消息 java.lang.NullPointerException
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 org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:598) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:514) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
根本原因。
java.lang.NullPointerException ruankao_web.Knowledge_Service.CiShowChuShi(Knowledge_Service.java:187) org.apache.jsp.tk_005fknowledge_005fservice_005flist_jsp._jspService(tk_005fknowledge_005fservice_005flist_jsp.java:502) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
):注意 主要问题的全部 stack 信息可以在 server logs 里查看