谁能帮我分析一下这是什么错误？怎么改正呀？高手过来指点一下呀？小弟谢谢啦
这是一个开源的在线考试系统，我登陆时，出现错误，不知道什么原因，高手过来指点一下呀？小弟谢谢啦
HTTP   Status   500   -  

--------------------------------------------

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
jinghua.CheckUser.getMessage(CheckUser.java:64)
org.apache.jsp.CheckUser_jsp._jspService(CheckUser_jsp.java:113)
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.



------解决方案--------------------
你用断点看看jinghua.CheckUser.java里的64行是不是取得的值是空的
------解决方案--------------------
贴代码吧，下面那个错是空指针，可能是变量没定义之类。上面那个是文件编译时遇到错，具体的错就要看代码了没办法
------解决方案--------------------
CheckUser.java的64行取值为空
------解决方案--------------------
空指针异常.jinghua.CheckUser.getMessage()方法里抛出的.
------解决方案--------------------
CheckUser.jsp第113,空指针了
我的异常网推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.aiyiweb.com/java-web/317.html