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

" h8 y0 R$ k$ W- E# pServlet.service() for servlet [jsp] in context with path [/exam] threw exception [An exception occurred processing JSP page /index.jsp at line 26
% S2 Z4 Z% U6 E. A3 a6 X
& D( i) v6 U0 R+ X0 v23:   </tr>
$ w* j1 P; }% b5 }6 \, K( @: v% z24: </table>
25: <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">
9 S( ^' C  K* T/ D+ F27:           <tr>
1 Z& c' v# J8 V2 l, |( Y28:             <td>
, P) w$ d& u& Z5 X9 T# \. W1 a29:                                   
1 O& n9 q/ |+ ^, s: m+ O- n9 O2 e
3 D; M7 L( |' B! R9 D9 A% v
Stacktrace:] with root cause
& `; o. z% Z# _* _* Z$ }javax.servlet.jsp.JspException: Exception creating bean of class com.wgh.actionForm.StudentForm: {1}
        at org.apache.struts.taglib.html.FormTag.initFormBean(FormTag.java:487)
# X( s% a6 U" O2 t; j7 e% E1 e        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)
        at org.apache.jsp.index_jsp._jspService(index_jsp.java:114)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
8 e6 w6 y5 }, S$ O0 S* d        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)
2 q; T$ f- H% q: e        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
- u4 [3 D3 Z* ]' v; E* a        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
+ ?9 J- P+ C# p/ h, m) u        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
3 f1 ^: r/ l* Y6 N3 B* V4 \        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
1 F! _0 }; G# D/ V; n$ p        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
; s# q8 D% n3 b3 L, ^2 m4 |        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
& Q2 x$ w7 {1 t# y# d, z: ]        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
, \5 h7 H" Q+ S1 n' l6 z  s, b        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)