Spring 3 MVC - form:errors not showing the errors

Question

I am using annotation based validation but for one of the forms I am not able to show any errors using the form:errors tag. When I debug the method, I can see the BindingResult has errors, but for some reason its not being displayed on the form. I am stumped as I have got it working on other forms, but for some reason this particular form is having issues. Any pointers are greatly appreciated.

Here is some code from the controller, I have the copyCartForm as a @SessionAttribute as well in the Controller:

@RequestMapping(params="action=Confirm Copy", method=RequestMethod.POST)
public String copyCart(@Valid CopyCart copyCartForm, BindingResult result) {
    if (result.hasErrors()) {
        logger.debug("errors in form" + result.toString());
        return "copyshoppingcart";
    } else {
                    ...
                    ...
        return "redirect:/home";
    }
}

In the JSP I have tried this:

<form:errors path="*" cssClass="formError"/>

as well as:

<form:errors path="fieldName" cssClass="formError"/>

Neither works.

I had to use `@ModelAttribute` to get this working. So the form was preceded by `@ModelAttribute("copyCartForm") @Valid CopyCart copyCartForm, BindingResult result)` Not sure why though? At other places it works without that. — Eqbal, May 18 '10 at 22:29

score 43 · Accepted Answer · answered May 27 '10 at 21:02

43

I had to use @ModelAttribute to get this working. So the form was preceded by @ModelAttribute("copyCartForm") @Valid CopyCart copyCartForm, BindingResult result)

answered May 27 '10 at 21:02

Eqbal

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8

This worked for me. It seems that if your model attribute name (copyCartForm) doesn't match the class name of the model (copyCart) that you have to specify it as a parameter to the @ModelAttribute attribute. – Josh Aug 23 '11 at 11:56
1

Hey! Thanks, I'm looking into this right now and my bindingResult.hasErrors() doesn't seem to be returning anything even though I've added annotations on the model such as notnull etc. – Michael Dec 11 '16 at 15:56

score 9 · Answer 2 · answered Sep 20 '12 at 14:45

One more approach, If for some reason you cannot use @ModelAttribute("copyCartForm") when use follow:

@RequestMapping(method=RequestMethod.POST)
public String post(@Valid CopyCart copyCartForm, BindingResult bindingResult, ModelMap modelMap) {
    if (bindingResult.hasErrors()) {
        modelMap.put(BindingResult.class.getName() + ".copyCartForm", bindingResult);
        return "copyshoppingcart";
    }
    return "redirect:/home";
}

score 6 · Answer 3 · edited Dec 20 '11 at 13:43

6

I faced the same issue.

I had to use the @ModelAttribute("attributeName") to get the validation error back in response.

edited Dec 20 '11 at 13:43

stema

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answered Dec 20 '11 at 13:36

Ahamed Mustafa

61
1
2

score 2 · Answer 4 · answered Sep 14 '16 at 22:36

I am not sure why and I suffered a lot until I figured it out, but you HAVE TO name your bean exactly as your bean class. So copyCartForm should be just copyCart.

@RequestMapping(params="action=Confirm Copy", method=RequestMethod.POST)
public String copyCart(@Valid CopyCart copyCart, BindingResult result) {
    if (result.hasErrors()) {
        logger.debug("errors in form" + result.toString());
        return "copyshoppingcart";
    } else {
                    ...
                    ...
        return "redirect:/home";
    }
}

This must also be changed on the form tag:

<form:form action="....." method="..." commandName="copyCart">

score 0 · Answer 5 · answered Mar 27 '21 at 22:24

0

you need to add this dependency to your pom.xml:

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-validation</artifactId>
    </dependency>
</dependencies>

answered Mar 27 '21 at 22:24

ismailalabou

37
2
8

Spring 3 MVC - form:errors not showing the errors

5 Answers5

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