How to use spring DAO methods with Managedbean object?

Question

I have this ManagedBean:

@ManagedBean(name="studentItem")
@ViewScoped 
public class StudentBean implements Serializable {

    private static final long serialVersionUID = 1L;

    @ManagedProperty("#{StudentService}")
    private StudentService studentService;

    private int regId;
    private String firstName;
    private String lastName;

    //getters and setters


    public void saveStudent(StudentBean student) {
        //calling from xhtml to save form data

        studentService.addStudent(student);
    }
}

and this service implementation:

@Component
@Service("StudentService")
public class StudentServiceImpl implements StudentService {
    @Autowired
    private UserDao<Student> studentDao;
    @Override
    @Transactional
    public void addStudent(StudentBean student) {
         Student stu=new Student();
         stu.setRegId(student.getRegId());
         stu.setFirstName(student.getFirstName());
         stu.setLastName(student.getLastName());
         studentDao.addItem(stu);
    }
}

as you can see, I had to convert my StudentBean managed-bean object to Student object type to save it in database using DAO methods. Is there any standard way other than ugly copying properties one by one?

You can save the StudentBean as it is in case it is the same object. — Σωτήρης Ραφαήλ, Nov 08 '18 at 14:34
This question is not related to Spring. Start reading https://stackoverflow.com/questions/30639785/jsf-controller-service-and-dao first lots of relevant info. But this is sort of a duplicate:The 'scatter-gatther' antipattern https://stackoverflow.com/questions/10301363/jpa-entity-as-jsf-bean And read https://stackoverflow.com/questions/7223055/making-distinctions-between-different-kinds-of-jsf-managed-beans/7223910#7223910 and https://stackoverflow.com/questions/8463178/what-to-use-managed-beans-backing-beans-or-entity-beans — Kukeltje, Nov 08 '18 at 16:54

score 1 · Accepted Answer · answered Nov 08 '18 at 15:01

You are violating the MVC (Model View Controller) pattern! You have 3 parts (the Model=Student, the View (your facelet) and the Controller=StudentBean) which should be independent.

If I were you I'll proceed like this:

@ManagedBean(name="studentItem")
@ViewScoped 
public class StudentBean implements Serializable {
  private Student currentStudent;
  //getter/setter 

  @ManagedProperty("#{StudentService}")
  private StudentService studentService;      

  public String renderStudentForm(){
    //create a new student when you load the form
    currentStudent = new Student();
  }

  public void saveStudent(){
    studentService.addStudent(currentStudent);
  }
}

In your form view you can call student properties using EL #{studentItem.currentStudent.name}

You got the idea.

score -1 · Answer 2 · answered Nov 08 '18 at 14:57

-1

There are a few utilities out there that help you in this situation. You can try BeanUtils copy properties or DozerMapper

answered Nov 08 '18 at 14:57

Chris

448
2
8

That would be a way to uphold a bad design. Better to do what the duplicates and the answer suggest – Kukeltje Nov 08 '18 at 21:03

How to use spring DAO methods with Managedbean object?

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