<form:errors> tag in spring 3 is not showing errors

I am working on a Spring 3 MVC application with form validation. The validation is w开发者_JS百科orking on the server side but even though I am returning the BindingResult the tag doesn't show a message when validation fails.

Controller Method:

  @RequestMapping(value = "server/{serverId}/save", method = RequestMethod.POST)
  public ModelAndView saveServer( @PathVariable long serverId,
                                  @Valid ServerEditor serverEditor, 
                                  BindingResult result){

        AdminSystemServer server = adminService.loadServer(serverId);
        if (!result.hasErrors()){
            server.setServerName(serverEditor.getServerName());
            server.setServerUrl(serverEditor.getServerUrl());
            adminService.save(server);
        }

        mv.setViewName(".layout.servers.manage.server");
        mv.addObject("server", server);
        mv.addObject("result", result);
        return mv;
    }

Form jsp

<form:form commandName="serverEditor" action="/admin/app/servers/manage/system/save">
<span class="tableRow">
    <label for="serverName">System Name</label>
    <form:input path="serverName" class="required" /><br />
</span>

<span class="tableRow">
    <form:errors cssClass="errors" path="serverName" />
    </span>

</form:form>

I know the validation is working, as I step through debug and see the errors in the binding result, but the messages never appear.

Anyone have any ideas?

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Try adding

@ModelAttribute("commandName"),

as a method parameter after @PathVariable long serverId,

Also can you post more of your jsp?

---

In your sample code you are displaying error for "systemName" while bound bean has property "serverName"...

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Turns out my problem, which someone asked about earlier but I didn't think was connected, was having the ModelAndView declared on the class level. This prevents the bindingresult from being properly inserted into the model.