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15.3.3. Writing a login form

The credentials component provides both username and password properties, catering for the most common authentication scenario. These properties can be bound directly to the username and password fields on a login form. Once these properties are set, calling identity.login() authenticates the user with the credentials provided. An example of a simple login form is as follows: 
<div>
  <h:outputLabel for="name" value="Username"/>
  <h:inputText id="name" value="#{credentials.username}"/>
</div>

<div>
  <h:outputLabel for="password" value="Password"/>
  <h:inputSecret id="password" value="#{credentials.password}"/>
</div>

<div>
  <h:commandButton value="Login" action="#{identity.login}"/>
</div>
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Similarly, the user is logged out by calling #{identity.logout}. This action clears the security state of the currently authenticated user and invalidate the user's session.
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