form:errors doesn't render on jsp

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I have following controller:

@RequestMapping(value = "/member/createCompany/addParams", method = RequestMethod.POST)
    public String setCompanyParams(
            @ModelAttribute MyDto myDto,
            @RequestParam(value = "g-recaptcha-response") String recapchaResponse,
            HttpSession session, Principal principal, Model model) throws Exception {

        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        Validator validator = factory.getValidator();
        Set<ConstraintViolation<MyDto>> violations;        
        if(condition1){
               violations = validator.validate(myDto, ValidationGroup1.class);
        } else {
              violations = validator.validate(myDto);
        }
        if (violations.size() > 0) {
            return "member/createCompany/addParams";
        }
}

MyDto class:

class MyDto {
    @NotEmpty
    String companyName;    

    @NotEmpty(groups = ValidationGroup1.class)
    String generatedPassword;
}

and following jsp:

   <form:form commandName="myDto" id="addParams" action="/member/createCompany/addParams" method="POST">
                        <form:errors cssClass="error"  path="companyName"/><br/>
                        <form:input type="text" id="companyName" path="companyName" name="companyName" maxlength="255" value="${campaign.campaignName}"/><br/>

                        <form:errors cssClass="error"  path="generatedPassword"/><br/>
                        <form:input path="generatedPassword" type="text" id="generatedPassword" name="generatedPassword" value="${generatedPassword}" />
                         ... 
   </form:form>     

When I submit form I see that

violations.size() > 0

but when I see rendered page I dont see error messages.

What the problem?

asked 22 secs ago

gstackoverflow

2,415

form:errors doesn't render on jsp