<logic:iterate id="aguser" name="aguseroverview">
        <tr>
        <td align="left" class="page"

        <a href="processuser.do?actiontype=view&aguserid=<bean:write name="aguser" property="userid" filter="true" />">
            <bean:write name="aguser" property="userid" filter="true" /></a>
          </td>
             <td align="center" class="page"><bean:write name="aguser" property="username" filter="true" /></td>
             <td align="center" class="page"><bean:write name="aguser" property="password" filter="true" /></td>
             <td align="center" class="page">
             <logic:equal name="aguser" property="roleid" value="1">
             管理员
             </logic:equal>
             <logic:equal name="aguser" property="roleid" value="2">
             普通员工
             </logic:equal>
             </td>
          </tr>
</logic:iterate>

如果把红色那段去掉，程序就能运行，也能把数据表现出来， 但是如果留下这段，页面就会出错误：

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: cannot find message resources under key org.apache.struts.action.message	org.apache.jasper.runtime.pagecontextimpl.dohandlepageexception(pagecontextimpl.java:867)	org.apache.jasper.runtime.pagecontextimpl.handlepageexception(pagecontextimpl.java:800)	org.apache.jsp.system.user.queryuserresult_jsp._jspservice(queryuserresult_jsp.java:175)	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)	org.apache.struts.action.requestprocessor.doforward(requestprocessor.java:1056)	org.apache.struts.action.requestprocessor.processforwardconfig(requestprocessor.java:388)	org.apache.struts.action.requestprocessor.process(requestprocessor.java:231)	org.apache.struts.action.actionservlet.process(actionservlet.java:1164)	org.apache.struts.action.actionservlet.doget(actionservlet.java:397)	javax.servlet.http.httpservlet.service(httpservlet.java:743)	javax.servlet.http.httpservlet.service(httpservlet.java:856)

root cause

javax.servlet.jsp.jspexception: cannot find message resources under key org.apache.struts.action.message	org.apache.struts.taglib.tagutils.retrievemessageresources(tagutils.java:1233)	org.apache.struts.taglib.tagutils.message(tagutils.java:1082)	org.apache.struts.taglib.tagutils.message(tagutils.java:1057)	org.apache.struts.taglib.bean.writetag.retrieveformatstring(writetag.java:256)	org.apache.struts.taglib.bean.writetag.formatvalue(writetag.java:319)	org.apache.struts.taglib.bean.writetag.dostarttag(writetag.java:234)	org.apache.jsp.system.user.queryuserresult_jsp._jspx_meth_bean_write_0(queryuserresult_jsp.java:206)	org.apache.jsp.system.user.queryuserresult_jsp._jspservice(queryuserresult_jsp.java:125)	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)	org.apache.struts.action.requestprocessor.doforward(requestprocessor.java:1056)	org.apache.struts.action.requestprocessor.processforwardconfig(requestprocessor.java:388)	org.apache.struts.action.requestprocessor.process(requestprocessor.java:231)	org.apache.struts.action.actionservlet.process(actionservlet.java:1164)	org.apache.struts.action.actionservlet.doget(actionservlet.java:397)	javax.servlet.http.httpservlet.service(httpservlet.java:743)	javax.servlet.http.httpservlet.service(httpservlet.java:856)

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

apache tomcat/5.0.19