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Attention: This component is still under progress and experimental.
b:messages The messages tag renders faces messages with the Boostrap alert style.
Tag attributes
component

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.

add fatal messageadd error messageadd warn messageadd info messageclear messages 
                            <!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml" 
      xmlns:h="http://xmlns.jcp.org/jsf/html" 
      xmlns:f="http://xmlns.jcp.org/jsf/core" 
      xmlns:b="http://butterfaces.org/components"> 
<h:head /> 
<body>
    <h:form>
        <b:messages globalOnly="false"
                    showDetail="false"
                    rendered="true" />

        <div class="btn-group">
            <b:commandLink value="add fatal message"
                           styleClass="btn btn-outline-secondary"
                           action="#{myBean.addFatalMessageToContext()}">
                <f:ajax execute="@this" render="@form"/>
            </b:commandLink>
        </div>
    </h:form>

</body> 
</html>
                        
                            package org.butterfaces.tree.demo;

import import javax.faces.application.FacesMessage;
import import javax.faces.context.FacesContext;
import import javax.faces.view.ViewScoped;
import import javax.inject.Named;

@ViewScoped
@Named
public class MyBean implements Serializable {

    public void addFatalMessageToContext() {
        final FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_FATAL,
                                                  "summary text...",
                                                  "detail text...")
        FacesContext.getCurrentInstance().addMessage(null, facesMessage);
    }

}