Customize spring validation error

I want customize the spring validation error for

@NotNull
@Length(max = 80)
private String email;

but I'm unable to do it.
What are the step to follow?

The [JSR 303 default message interpolation algorithm][1] allows you to customize messages by supplying a resource bundle named ValidationMessages. Create a `ValidationMessages.properties` file in the classpath containing:

javax.validation.constraints.NotNull.message=CUSTOM NOT NULL MESSAGE
javax.validation.constraints.Size.message=CUSTOM SIZE MESSAGE

This changes the default message for the `@Size` constraint, so you should use the `@Size` constraint instead of the Hibernate-specific `@Length` constraint.

Instead of changing the default message for all constraints, you can change the message for a specific constraint instance. Set the `message` attribute on the constraint:

@NotNull(message = "{email.notnull}")
private String email;

And add the message to the `ValidationMessages.properties` file:

email.notnull=E-mail address is required


[1]:

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By Spring I am assuming you mean Spring MVC.

From the below reference

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Here you go -

You create a validator class -

public class UserValidator implements Validator {

public boolean supports(Class candidate) {
return User.class.isAssignableFrom(candidate);
}

public void validate(Object obj, Errors errors) {
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "firstName", "required", "Field is required.");
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "lastName", "required", "Field is required.");
}
}

Put in any validation text you want in the above field.

In the JSP you will need the following tag -

<tr>
<td>First Name:</td>
<td><form:input path="firstName" /></td>
<!-- Show errors for firstName field -->
<td><form:errors path="firstName" /></td>
</tr>

This way any validation error for `firstName` will be printed.