@Entity
public class Response{
@Id
private long responseID;
@OneToManye(mappedBy="response")
List <Income> incomes;
}

@Entity
    public class Income{
    @Id
    private long incomeID;
    @ManytoOne
    JoinColumn(name="RESPONSE_ID")
    private Response response;
    @OneToManye(mappedBy="income")
    List <IncomeBlock> incomeBlocks;
    }

@Entity
    public class IncomeBlock{
    @Id
    private long incomeBlockID;
    @ManytoOne
    JoinColumn(name="INCOME_ID")
    private Income income;
    @OneToManye(mappedBy="income")
    List <IncomeDetail> incomeDetails;
    }

@Entity
    public class IncomeDetail{
    @Id
    private long incomeDetailID;
    @ManytoOne
    JoinColumn(name="INCOME_BLK_ID")
    private IncomeBlock incomeBlock;
    @OneToManye(mappedBy="incomeDetail")
    List <IncomeDetail> incomeDetails;
    }