How to do it...

You need to perform the following steps to complete this recipe:

1. Let's create a User object that will be attached to our JSF page:

@Named
@RequestScoped
public class User {
    
    @NotBlank (message = "Name should not be blank")
    @Size (min = 4, max = 10,message = "Name should be between 
    4 and 10 characters")
    private String name;
    
    @Email (message = "Invalid e-mail format")
    @NotBlank (message = "E-mail should not be blank")
    private String email;
    
    @PastOrPresent (message = "Created date should be 
    past or present")
    @NotNull (message = "Create date should not be null")
    private LocalDate created;
    
    @Future (message = "Expires should be a future date")
    @NotNull (message = "Expires should not be null")
    private LocalDate expires;


    //DO NOT FORGET TO IMPLEMENT THE GETTERS AND SETTERS

    ...

2. Now, we need to define the method that will be fired once all the data is valid:

    public void valid(){
        FacesContext
                .getCurrentInstance()
                .addMessage(
                    null, 
                    new FacesMessage(FacesMessage.SEVERITY_INFO,
                    "Your data is valid", ""));
    }

3. Now, our JSF page references each User class field that's been declared, as follows:

<h:body>
 <h:form>
 <h:outputLabel for="name" value="Name" />
 <h:inputText id="name" value="#{user.name}" />
 <br/>
 <h:outputLabel for="email" value="E-mail" />
 <h:inputText id="email" value="#{user.email}" />
 <br/>
 <h:outputLabel for="created" value="Created" />
 <h:inputText id="created" value="#{user.created}">
     <f:convertDateTime type="localDate" pattern="dd/MM/uuuu" /> 
 </h:inputText>
 <br/>
 <h:outputLabel for="expire" value="Expire" />
 <h:inputText id="expire" value="#{user.expires}">
     <f:convertDateTime type="localDate" pattern="dd/MM/uuuu" /> 
 </h:inputText>
 <br/>
 <h:commandButton value="submit" type="submit" action="#{user.valid()}" />
 </h:form>
</h:body>

If you run this code, all the fields will be validated once you click the Submit button. Try it for yourself!