Project.java

@Entity
public class Project {

    @Id
    @GeneratedValue
    private Long id;

    private String name, description;

    @OneToMany(mappedBy = "project")
    private List<Developer> developers;

    private Project() {

    }

    public Project(String name, String description, List<Developer> developers) {
        this.name = name;
        this.description = description;
        this.developers = developers;
    }