Cannot find bean under name customerClassList

一、CustomerInfoList.jsp页面:<td align="right">客户分类：<br/></td>
<td>
      <html:select property="customerClassID">
      <html:option value="0">&nbsp;</html:option>
<html:options collection="customerClassList" labelProperty="ClassName" property="customerClassID"/>
</html:select><br/></td>
二、CustomerInfoQueryAction.java代码CustomerClassDAO customerClassDAO = (CustomerClassDAO)this.getCtx().getBean("CustomerClassDAO");
List customerClassList = customerClassDAO.findAll();
request.setAttribute("customerClassList", customerClassList);三、错误：
javax.servlet.jsp.JspException: Cannot find bean under name customerClassList
at org.apache.struts.taglib.html.OptionsTag.getIterator(OptionsTag.java:364)
at org.apache.struts.taglib.html.OptionsTag.doEndTag(OptionsTag.java:186)
at org.apache.jsp.CustomerInfo.CustomerInfoList_jsp._jspx_meth_html_options_0(CustomerInfoList_jsp.java:462)
at org.apache.jsp.CustomerInfo.CustomerInfoList_jsp._jspx_meth_html_select_0(CustomerInfoList_jsp.java:396)
at org.apache.jsp.CustomerInfo.CustomerInfoList_jsp._jspx_meth_html_form_0(CustomerInfoList_jsp.java:343)
at org.apache.jsp.CustomerInfo.CustomerInfoList_jsp._jspService(CustomerInfoList_jsp.java:118)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
请问这个问题怎么解决啊？