大伙说说。这是什么问题。。。

我的jsp程序页面，第一运行出错（原来是没有使用框架是没问题的）不显示页面。。。。但刷新后就可以显示了。。。。，

HTTP Status 500 -

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

type Exception report

message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: com/hhsoft/work/cg/cgzr/cgzrd
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:867)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:800)
org.apache.jsp.main.cg.cgzr.cgzrd_005fbottom_jsp._jspService(cgzrd_005fbottom_jsp.java:552)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause

java.lang.NoClassDefFoundError: com/hhsoft/work/cg/cgzr/cgzrd
org.apache.jsp.main.cg.cgzr.cgzrd_005fbottom_jsp._jspService(cgzrd_005fbottom_jsp.java:81)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


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