public void init( Context application ){
 		
 		AuthorizationManager authorizationManager = new AuthorizationManager();
 		authorizationManager.addGroup( new Group( "admins" ) );
 		authorizationManager.addGroup( new Group( "managers" ) );
 		authorizationManager.addGroup( new Group( "users" ) );
 		AuthorizationManager.setInstance( application , authorizationManager );
 		
 		this.personDAO = new DefaultComponent( PersonHibernateDAO.class );
 		this.messageDAO = new DefaultComponent( MessageHibernateDAO.class );
 		this.noticeDAO = new DefaultComponent( NoticeHibernateDAO.class );
 		
 		this.setDebugMode( true );
 		
 	}

public class LoginAction extends BaseLoginAction {	
 	
 	private static final MessageContext MSG_CONTEXT = new ClassMessageContext( LoginAction.class );
 	private static final String INEXISTENT_USER = "Este usuário não existe ou usuário e senha incorretos!";
 	private static final String EMPTY_USER_FIELD = "Campo usuário está vazio!";
 	private static final String EMPTY_PASSWORD_FIELD = "Campo senha está vazio";
 	
 	public String execute() throws Exception {
 		return this.login();
 	}
 	
 	public String login() throws Exception {
 		String login = input.getStringValue( "login" );
 		String password = input.getStringValue( "passw" );
 		if( login == null || login.trim().equals( "" ) ){
 			this.addError( "login" , EMPTY_USER_FIELD , MSG_CONTEXT );
 			return ERROR;
 		}
 		if( password == null || password.trim().equals( "" ) ){
 			this.addError( "passw" , EMPTY_PASSWORD_FIELD , MSG_CONTEXT );
 			return ERROR;
 		}
 		PersonManager personManager = new PersonManager( ( PersonDAO ) input.getValue( "personDAO" ) );
 		Person person = personManager.loadForLoginAndPassword( login , password );
 		if( person == null ){
 			this.addError( INEXISTENT_USER , MSG_CONTEXT );
 			return ERROR;
 		}else{				
 			this.setUserSession( person );
 			Iterator it = person.getGroups().iterator();
 			List groups = new ArrayList();
 			while( it.hasNext() ){
 				groups.add( ( ( Group ) it.next() ).getName() );					
 			}
 			this.setUserGroups( groups );
 			return SUCCESS;
 		}
 	}
 
 }

public class Group {
 	
 	private Set persons = new HashSet();
 	private String name;
 	
 	public Group(){ }
 	
 	public Group( String name ){
 		this.name = name;
 	}
 		
 	public void setName( String name ){
 		this.name = name;
 	}
 	
 	public String getName(){
 		return this.name;
 	}
 	
 	public void addPerson( Person person ){
 		//person.addGroup( this );
 		this.persons.add( person );
 	}
 	public void setPersons( Set persons ){
 		this.persons = persons;
 	}
 	public Set getPersons(){
 		return this.persons;
 	}
 
 }