HTTP Status 500 - java.lang.NullPointerException错误，怎么解决呢？？？？？？？

xiao_sheshe 2019-04-09 11:20:39

HTTP Status 500 - java.lang.NullPointerException

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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)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)

root cause

java.lang.NullPointerException
Pluto.DBConnection.executeQuery(DBConnection.java:101)
org.apache.jsp.index_jsp._jspService(index_jsp.java:290)
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)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.73 logs.

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Apache Tomcat/7.0.73

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