@Named
@SessionScoped
public class AbonneControllerBean {
 
	public String groupName;
	public int groupid;
	public Abonne session_abonne;
	public List<Student> students;  // present here whereas the Abonne POJO class shall only contain a list of lastNames
	@Inject
	public StudentDAO studentDAO;
 
	//private List<String> courseNames;
	private List<Course> courses;
	@Inject
	public CourseDAO courseDAO;
 
	@PostConstruct
	public void init() {
	   this.groupName = "science";
	   this.groupid = 1;
	   IDatabase connectMySQLService = DatabaseMySQLConnect.getInstance();
		//	this.studentDAO = new StudentDAO(connectMySQLService);
	   this.studentDAO.setConnectService(connectMySQLService);
	   this.students = this.studentDAO.findAll();
	   this.courseDAO.setConnectService(connectMySQLService);
	   this.courses = this.courseDAO.findAll();
	}
 
}

@Configuration
public class CourseDAO implements IEntityDAO<Course> {
 
	private IDatabase connectService; // dependency injection
	private Connection connect;
 
	@Autowired
	public void setConnectService(IDatabase connectService) {
		this.connectService = connectService;
	}
 
	public CourseDAO() {
		try {
			this.connect = connectService.getConnection();
		} catch (Exception e) {
			System.out.println("AbonneDAO error getConnection");
		}
	}
//...
}