title: org.apache.struts.action.ActionMessage cannot be cast to org.apache.struts.action.ActionError
body: <p>I am working on struts1.2 application. I created a formbean extending validatorform, then override the method validate().</p>
  
  <p>then when I  am running the flow. its giving me the error .</p>
  
  <pre><code>Aug 21, 2011 8:42:07 PM org.apache.catalina.core.ApplicationDispatcher invoke
  SEVERE: Servlet.service() for servlet jsp threw exception
  java.lang.ClassCastException: org.apache.struts.action.ActionMessage cannot be cast to org.apache.struts.action.ActionError
      at org.apache.struts.taglib.html.ErrorsTag.doStartTag(ErrorsTag.java:215)
      at org.apache.jsp.SubmitPost_jsp._jspx_meth_html_005ferrors_005f0(SubmitPost_jsp.java:552)
      at org.apache.jsp.SubmitPost_jsp._jspService(SubmitPost_jsp.java:270)
      at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
      at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
      at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
      at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
      at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
      at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
      at org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
      at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:345)
      at org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
      at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
      at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
      at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:851)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
      at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:257)
      at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
      at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1764)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:619)
  Aug 21, 2011 8:42:07 PM org.apache.catalina.core.StandardWrapperValve invoke
  SEVERE: Servlet.service() for servlet [action] in context with path [/streetshop] threw exception [java.lang.ClassCastException: org.apache.struts.action.ActionMessage cannot be cast to org.apache.struts.action.ActionError] with root cause
  java.lang.ClassCastException: org.apache.struts.action.ActionMessage cannot be cast to org.apache.struts.action.ActionError
      at org.apache.struts.taglib.html.ErrorsTag.doStartTag(ErrorsTag.java:215)
      at org.apache.jsp.SubmitPost_jsp._jspx_meth_html_005ferrors_005f0(SubmitPost_jsp.java:552)
      at org.apache.jsp.SubmitPost_jsp._jspService(SubmitPost_jsp.java:270)
      at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
      at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
      at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
      at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
      at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
      at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
      at org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
      at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:345)
      at org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
      at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
      at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
      at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:851)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
      at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:257)
      at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
      at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1764)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:619)
  DEBUG [http-apr-8080-exec-12] (RequestUtils.java:1799) - Get module name for path /Postaddd.do
  DEBUG [http-apr-8080-exec-12] (RequestUtils.java:1821) - Module name found: default
  DEBUG [http-apr-8080-exec-12] (RequestProcessor.java:225) - Processing a 'GET' for path '/Postaddd'
  DEBUG [http-apr-8080-exec-12] (RequestUtils.java:764) -  Looking for ActionForm bean instance in scope 'request' under attribute key 'PostadddForm'
  DEBUG [http-apr-8080-exec-12] (RequestUtils.java:839) -  Creating new ActionForm instance of type 'bseller.postadd.PostaddForm'
  DEBUG [http-apr-8080-exec-12] (RequestUtils.java:844) -  --&gt; bseller.postadd.PostaddForm@3b061299
  DEBUG [http-apr-8080-exec-12] (RequestProcessor.java:372) -  Storing ActionForm bean instance in scope 'request' under attribute key 'PostadddForm'
  DEBUG [http-apr-8080-exec-12] (RequestProcessor.java:813) -  Populating bean properties from this request
  DEBUG [http-apr-8080-exec-12] (BeanUtils.java:792) - BeanUtils.populate(bseller.postadd.PostaddForm@3b061299, {dispatch=[Ljava.lang.String;@baf1915})
  DEBUG [http-apr-8080-exec-12] (BeanUtils.java:873) -   setProperty(bseller.postadd.PostaddForm@3b061299, dispatch, [showSubmitPostPage])
  DEBUG [http-apr-8080-exec-12] (RequestProcessor.java:940) -  Validating input form properties
   INFO [http-apr-8080-exec-12] (PostaddForm.java:119) - validate method called
   INFO [http-apr-8080-exec-12] (PostaddForm.java:122) - Email Id: null
  DEBUG [http-apr-8080-exec-12] (RequestProcessor.java:972) -  Validation failed, returning to '/SubmitPost.jsp'
  DEBUG [http-apr-8080-exec-12] (RequestProcessor.java:1010) -  Delegating via forward to '/SubmitPost.jsp'
  DEBUG [http-apr-8080-exec-12] (PropertyMessageResources.java:177) - getMessage(en_SG,errors.header)
  DEBUG [http-apr-8080-exec-12] (PropertyMessageResources.java:269) - loadLocale(en_SG)
  DEBUG [http-apr-8080-exec-12] (PropertyMessageResources.java:177) - getMessage(en_SG,errors.footer)
  DEBUG [http-apr-8080-exec-12] (PropertyMessageResources.java:269) - loadLocale(en_SG)
  DEBUG [http-apr-8080-exec-12] (PropertyMessageResources.java:177) - getMessage(en_SG,errors.prefix)
  DEBUG [http-apr-8080-exec-12] (PropertyMessageResources.java:269) - loadLocale(en_SG)
  DEBUG [http-apr-8080-exec-12] (PropertyMessageResources.java:177) - getMessage(en_SG,errors.suffix)
  DEBUG [http-apr-8080-exec-12] (PropertyMessageResources.java:269) - loadLocale(en_SG)
  Aug 21, 2011 8:42:16 PM org.apache.catalina.core.ApplicationDispatcher invoke
  SEVERE: Servlet.service() for servlet jsp threw exception
  java.lang.ClassCastException: org.apache.struts.action.ActionMessage cannot be cast to org.apache.struts.action.ActionError
      at org.apache.struts.taglib.html.ErrorsTag.doStartTag(ErrorsTag.java:215)
      at org.apache.jsp.SubmitPost_jsp._jspx_meth_html_005ferrors_005f0(SubmitPost_jsp.java:552)
      at org.apache.jsp.SubmitPost_jsp._jspService(SubmitPost_jsp.java:270)
      at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
      at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
      at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
      at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
      at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
      at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
      at org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
      at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:345)
      at org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
      at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
      at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
      at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:851)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
      at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:257)
      at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
      at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1764)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:619)
  Aug 21, 2011 8:42:16 PM org.apache.catalina.core.StandardWrapperValve invoke
  SEVERE: Servlet.service() for servlet [action] in context with path [/streetshop] threw exception [java.lang.ClassCastException: org.apache.struts.action.ActionMessage cannot be cast to org.apache.struts.action.ActionError] with root cause
  java.lang.ClassCastException: org.apache.struts.action.ActionMessage cannot be cast to org.apache.struts.action.ActionError
      at org.apache.struts.taglib.html.ErrorsTag.doStartTag(ErrorsTag.java:215)
      at org.apache.jsp.SubmitPost_jsp._jspx_meth_html_005ferrors_005f0(SubmitPost_jsp.java:552)
      at org.apache.jsp.SubmitPost_jsp._jspService(SubmitPost_jsp.java:270)
      at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:433)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
      at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
      at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
      at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
      at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
      at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
      at org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(RequestProcessor.java:1012)
      at org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(TilesRequestProcessor.java:345)
      at org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.java:980)
      at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
      at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
      at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:851)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
      at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:257)
      at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
      at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1764)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:619)
  </code></pre>
  
  <p>Please tell me what I can do following are my settings.</p>
  
  <pre><code>  &lt;action path="/Postaddd" 
              type="bseller.postadd.PostaddAction" 
              parameter="dispatch"
              scope="request"
              validate="true"
              input="/SubmitPost.jsp"
              name="PostadddForm"&gt;
          &lt;forward name="posterror" path="ordererror.page"/&gt;
          &lt;forward name="successPost" path="bseller.successPost.page"/&gt;  
  
      &lt;/action&gt;
  
  
  public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) 
      {
  
  
          Logger  log= Logger.getLogger("BSELLER_APPLICATION");
          log.info("validate method called");
          ActionErrors errors = new ActionErrors();
  
            log.info("Email Id: " + getEmailid()); 
            if(!Validation.isValidEmailAddress(getEmailid()))
                    {
                errors.add("emailid", new ActionMessage("prompt.email.error"));
                    }
            if(!Validation.isPhoneNumberValid(getMobile()))
            {
                errors.add("mobile", new ActionMessage("prompt.contactno.error"));
            }
  
            if(!Validation.isNumeric(getPrice()))
            {
                errors.add("price", new ActionMessage("prompt.price.error"));
            }
  
  
          return errors;
      }
  </code></pre>