HTTP状态 500 - 内部服务器错误


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


Apache Tomcat/8.5.56