15.3.2. Writing an authentication method

@Name("authenticator")
public class Authenticator {
  @In EntityManager entityManager;
  @In Credentials credentials;
  @In Identity identity;

  public boolean authenticate() {
    try {
      User user = (User) entityManager.createQuery(
          "from User where username = :username and password = :password")
          .setParameter("username", credentials.getUsername())
          .setParameter("password", credentials.getPassword())
          .getSingleResult();

      if (user.getRoles() != null) {
        for (UserRole mr : user.getRoles())
          identity.addRole(mr.getName());
        }

        return true;
      } catch (NoResultException ex) {
        return false;
      }

   }

}

@Name("authenticator")
public class Authenticator {
  @In EntityManager entityManager;
  @In Credentials credentials;
  @In Identity identity;

  public boolean authenticate() {
    try {
      User user = (User) entityManager.createQuery(
          "from User where username = :username and password = :password")
          .setParameter("username", credentials.getUsername())
          .setParameter("password", credentials.getPassword())
          .getSingleResult();

      if (user.getRoles() != null) {
        for (UserRole mr : user.getRoles())
          identity.addRole(mr.getName());
        }

        return true;
      } catch (NoResultException ex) {
        return false;
      }

   }

}