How to get validation messages to the UI?

Flow
1

I’ve a JPA which has all the validation rules as annotations. In the view, I’ve a binder for each field/bean for the JPA. When I’m trying to validate the form, all I see is. It doesn’t show the validation error in the UI.

JPA

@NotNull(message = "Contact name is required")
    @Size(min = 2, max = 50, message = "Contact name must be between 2 and 50 characters")
    private String contactName;

    @NotNull(message = "Company name is required")
    @Size(min = 2, max = 50, message = "Company name must be between 2 and 50 characters")
    private String companyName;

Binder

binder.forField(contactPersonName)
                .asRequired()
                .bind(Customer::getContactName, Customer::setContactName);
        binder.forField(companyNameField)
                .asRequired()
                .bind(Customer::getCompanyName, Customer::setCompanyName);

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2

Should I duplicate the validation error message I’ve in JPA into the binder asRequired() method as well ?

3

This part is also not working. I’ve to manually add asRequired for each field
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