求助大佬

讲讲

运行的在线考试系统报这个错误咋回事啊 myeclipse不报错啊

Servlet.service() for servlet [jsp] in context with path [/exam] threw exception [An exception occurred processing JSP page /index.jsp at line 26
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23:   </tr>
24: </table>
! O# J% Q9 [4 f8 v* w6 `  s3 {  [: m25: <table width="778" height="158"  border="0" align="center" cellpadding="0" cellspacing="0" background="Images/login_mid.jpg">
26: <html:form action="manage/student.do?action=login" method="post" focus="ID">
: U3 Q$ T4 H# K2 V# W27:           <tr>
( i( z  t: L* [7 V% q/ ?& x28:             <td>
29:                                   


Stacktrace:] with root cause
javax.servlet.jsp.JspException: Exception creating bean of class com.wgh.actionForm.StudentForm: {1}
) p7 L! x0 ^, k        at org.apache.struts.taglib.html.FormTag.initFormBean(FormTag.java:487)
        at org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:457)
        at org.apache.jsp.index_jsp._jspx_meth_html_005fform_005f0(index_jsp.java:157)
& @( n7 }2 i' P& ^% C2 V7 ~$ e        at org.apache.jsp.index_jsp._jspService(index_jsp.java:114)
% O% k6 r% [  U0 F2 h. p( s        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
( O. a. g- p1 W9 c$ A        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
1 X# I/ S0 V$ c  A5 ?; f, c2 m        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
+ m3 @$ Q* i& E2 h/ G5 k2 F% v0 K8 k        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
8 L  G: d# x/ N) L; u1 A; ~        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
' @4 H; g& A! [        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
& w: c9 g4 d& j) I$ _0 b        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)

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