Here is a simple way to get around with the red box validation that used to appear on af:input Components upon some validation

<af:inputText value="#{row.bindings.<attributeValue>.inputValue}"
 label="#{bindings.<tableBinding>.hints.<attributeValue>.label}"
 required="#{bindings.<tableBinding>.hints.<attributeValue>.mandatory}"
 columns="#{bindings.<tableBinding>.hints.<attributeValue>.displayWidth}"
 maximumLength="#{bindings.<tableBinding>.hints.<attributeValue>.precision}"
 shortDesc="#{bindings.<tableBinding>.hints.<attributeValue>.tooltip}"
 id="it3" validate="#{MyBean.validate}">

and in the MyBean class we have it like

public void validate(FacesContext facesContext, UIComponent uiComponent, Object value) {
        FacesMessage message = new FacesMessage();
        message.setDetail("Some Errror message");
        message.setSummary("Value Error message");
        message.setSeverity(FacesMessage.SEVERITY_ERROR);
        throw new ValidatorException(message);
}

what are we doing here..

• Getting the handle to the FacesMessage by explicitly instantiating it
• Set the Detail,Summary and Severity for the message
• Throwing the message as a ValidatorException