@Entity(tableName = "users")

public class UsersEntity{
    @PrimaryKey(autoGenerate = true)
    private long id;

    @NonNull
    private String name;

    @NonNull
    private long roleId;
}

@Entity(tableName = "roles")

    public class RolesEntity{
        @PrimaryKey(autoGenerate = true)
        private long id;

        @NonNull
        private String name;
    }

public class User{
   private long id;
   private Role role;
}

user = userDao.getUser(userId)
user.setRole(roleDao.getRole(user.getRoleId)