klasa survey:
@Entity
@Table(name="tblSurvey")
public class Survey implements Serializable {
    @Id
    @Column(name="SurveyID")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int surveyID;
    @NaturalId
    @Column(name="Name")
    private String surveyName;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "survey", cascade=CascadeType.ALL)
    private List<Question> questionSet;


klasa question:
@Entity
@Table(name="tblQuestion")
public class Question implements Serializable {
    @Id
    //@OneToMany(fetch = FetchType.EAGER, mappedBy = "surveyID", cascade=CascadeType.ALL)
    @Column(name="QuestionID")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int questionID;

    //@Column(name="SurveyID")
    @ManyToOne
    @JoinColumn(name="SurveyID")
    private Survey survey;
    //private int surveyID;

    @Column(name="Question")
    private String questionText;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "question", cascade=CascadeType.ALL)
    private List<Answer> answetList;

klasa answer:

@Entity
@Table(name="tblAnswer")
public class Answer implements Serializable {
    @Id
    @Column(name = "AnswerID")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int answerID;

    @ManyToOne
    @JoinColumn(name = "QuestionID")
    private Question question;
    @Column(name = "Answer")
    private String ans;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "answer", cascade=CascadeType.ALL)
    private List<UserAnswer> answerList;