org.apache.jasper.JasperException: Invalid property

I get this error when I try to access my index.jsp page.  I'm using jstl, spring, hibernate and I'm a beginner - so please explain if you ask me a question.

I know it will be hard to figure this out with out looking at all the code but if you have any ideas it would be greatly appreciated.  If you need to see more of the code just ask and I'll post it.  Thanks.

Here's the stacktrace

2007-07-09 07:45:07,321 ERROR [org.springframework.web.servlet.tags.BindTag] - <Invalid property 'subNumber' of bean class [com.account.bean.impl.People]: Getter for property 'subNumber' threw exception; nested exception is java.lang.reflect.InvocationTargetException: null>
org.springframework.beans.InvalidPropertyException: Invalid property 'subNumber' of bean class [com.account.bean.impl.People]: Getter for property 'subNumber' threw exception; nested exception is java.lang.reflect.InvocationTargetException: null
java.lang.reflect.InvocationTargetException
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:657)
      at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:643)
      at org.springframework.validation.BindException.getFieldValue(BindException.java:335)
      at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:117)
      at org.springframework.web.servlet.tags.BindTag.doStartTagInternal(BindTag.java:115)
      at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:68)
      at org.apache.jsp.WEB_002dINF.jsp.index_jsp._jspService(index_jsp.java:191)
      at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
      at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
      at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474)
      at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409)
      at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
      at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:97)
      at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
      at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:928)
      at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:705)
      at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:625)
      at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:392)
      at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:347)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
      at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
      at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
      at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
      at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
      at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
      at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
      at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
      at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
      at java.lang.Thread.run(Thread.java:534)

------------------------------------------------------------------------------------------------------------
Getter and Setter

public String getSubNumber() {
   return subNumber;
   }
            
public void setSubNumber(String subNumber) {
  this.subNumber = subNumber;
}

-------------------------------------------------------------------------------------------------------------------
HTML JSTL etc

<form action="index.jsp" method="post">

<table cellpadding="0" cellspacing="0">
    <tr><td> <spring:hasBindErrors name="People">                    
              <c:forEach var="err" items="${errors.globalErrors}">
              <c:out value="${err.defaultMessage}"/>
              </c:forEach>
            </spring:hasBindErrors>
   </td>
</tr>
 </table>
 
<table cellpadding="0" cellspacing="0">
     <tr>
         <td>Sub Number</td>
    </tr>
       <tr>
         <td><spring:bind path="People.subNumber">
              <input name="subNumber" value="<c:out value="${status.value}"/>">
              <c:out value="${status.errorMessage}"/>
            </spring:bind>
          </td>
            </tr>
            <tr>
             <td><input name="submit" type="submit" value="Search" /></td>
           </tr>
   </table>