急救~~~~~~~！！！

[lwaysFree]

HTTP Status 500 -

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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.index_jsp._jspService(index_jsp.java:238)
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.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.


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这是什么错误啊？应该怎么去改啊，各位快来帮帮忙~~~~~~~~~~~！！！！！！！！！！

[killme2008]

java.lang.NullPointerException
某个变量不是预期的值，是null，检查下吧

[sd4530609]

服务器遭遇了的说明内部的错误!
解决方法不一样，你代码很多吧，工程里面还是自己学着调试吧

[superlanneret]

空指针问题检查一下index.jsp中哪里用到JAVA类了，估计是对应的类里面有问题

[flyingboy623]

应该是对象是空值,还没分配内存,你就使用了此对象吧.

[xueqier]

java.lang.NullPointerException
报的是空指针，是因为你传的值取不到，可以通过设定断点来看看是什么地方取不到值。