@Named
@SessionScoped
public class UserBean implements Serializable{
private User user;
@EJB
private UserManager userManager;

boolean doLogin(String login, int passwordHash) {
    user = userManager.doLogin(login, passwordHash);
    if (logUser == null) {
        return false;
    } else {
        user = logUser;
        try {
            FacesContext.getCurrentInstance().getExternalContext().redirect("greetings");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return true;
}

@Stateless
 @LocalBean
 public class UserManager {
 @PersistenceContext(unitName = "examplePU")
 private EntityManager entityManager;

public User doLogin(String login, int passwordHash) {
    UserEntity userEntity = entityManager.find(UserEntity.class, login);
    return userEntity.toDto();
}

public User createUser(String login, int passwordHash){
    UserEntity newUserEntity = new UserEntity();
    newUserEntity.setName(login);
    newUserEntity.setPasswordHashCode(passwordHash);
    entityManager.persist(newUserEntity);
    return newUserEntity.toDto();
}

public void updateUser(User user){
    UserEntity userEntity = entityManager.find(UserEntity.class, user.getName());
    userEntity.fromDto(user);
    entityManager.merge(userEntity);
}
}

@Named @RequestScoped
public class RegistrationBean {

private String newLogin = "";
private String newPassword = "";
@EJB
private UserManager userManager;
@Inject
private UserBean userBean;

public void register() {
    newLogin = newLogin.trim();
    User newUser = userManager.createUser(newLogin, newPassword.hashCode());
    userBean.doLogin(newUser.getName(), newPassword.hashCode());
    }
}

20:38:22,150 ERROR [ru.rustem.servlets.ErrorHandler] (default task-1) ERRORServlet : greetingsServlet Code :500Message:Can not set ru.rustem.ejb.UserManager field ru.rustem.beans.UserBean.userManager to ru.rustem.ejb.UserManager$Proxy$_$$_Weld$EnterpriseProxy$Exception : class java.lang.IllegalArgumentException
20:38:24,402 ERROR [io.undertow.request] (default task-3) UT005023: Exception handling request to /view/: java.lang.IllegalArgumentException: Can not set ru.rustem.ejb.UserManager field ru.rustem.beans.UserBean.userManager to ru.rustem.ejb.UserManager$Proxy$_$$_Weld$EnterpriseProxy$