Java program using Clean Architecture, DAO and Repository

I’m developing a simple Java console program to access PostgreSQL database using JDBC.
The most inner layers talk to the outer layers by means abstraction (interface and abstract class).

My program follows the Clean Architecture and I have the following:

• domain

  • entity

      Student.java
    
      Course.java
    

  • repository

      Repository<T> (interface)
    
      StudentRepository (interface)
    
      CourseRepository (interface)
    

• use case

    StudentUseCase.java
  
    CourseUseCase.java
  

• infra

  • data

      ConnectionFactory.java
    
      DAO<T> (interface)
    
      StudentDAO.java (interface extends DAO)
    
      CourseDAO.java (interface extends DAO)
    
      StudentDAOImpl.java
    
      CourseDAOImpl.java
    
      StudentRepositoryImpl.java
    
      CourseRepository.java
    

Considering "scalability", the architecture of my program is OK? Can I have Repository and DAO at the same time? I guess so because this approach makes switching DB easier. Besides, My StudentRepositoryImpl has the method getAllStudents(), where it uses 2 DAO methods: getAllStudents() e getCourseByStudentId(int id). So, the StudentRepositoryImpl can properly combines the query results of both DAO methos to composethe Student objects (Student has the attributes: int id, String name and Course course).
I appreciate comments about. Thanks in advance.

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