jsp出现的问题，哪位高手帮忙解决一下

来源：百度知道 编辑：UC知道 时间：2024/06/13 17:54:06
type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NullPointerException
org.apache.jsp.liuyan.liuyan2_jsp._jspService(liuyan2_jsp.java:57)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servl

你的“liuyan2.jsp”所生成的Servlet中，第57行有空指针异常。请检查你是否在某个变量值为null的情况下试图对其操作。

java.lang.NullPointerException

把你的程序贴出来看看

到tomcat的work目录里找liuyan2_jsp.java，打开看代码吧，就知道为啥NullPointer了