Hibernate Self Join - Create Java Class

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Amazon Now we have the database tables to represent our entity Keyword and to join it to itself, let's create a Java class to embody a Keyword and its self-join characteristic. Note that you need to have two Sets of Keywords as the instance variables: one as its parents and one as its children. Then create simple setters and getters of each property. Easy right? Questions?

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01	package entity;

02

03	import java.util.Date;

04	import java.util.HashSet;

05	import java.util.Set;

06

07	import javax.persistence.Entity;

08	import javax.persistence.GeneratedValue;

09	import javax.persistence.Id;

10

11

@Entity

12	public class Keyword{

13

14

@Id

15	@GeneratedValue

16	private Integer keywordId;

17	private String title;

18	private String body;

19	private Set<keyword> parents = new HashSet<keyword>();

20	private Set<keyword> children = new HashSet<keyword>();

21	private Date lastModifiedTime;

22	private Date createTime;

23	public Integer getKeywordId() {

24	return keywordId;

25

}

26	public void setKeywordId(Integer keywordId) {

27	this.keywordId = keywordId;

28

}

29	public String getTitle() {

30	return title;

31

}

32	public void setTitle(String title) {

33	this.title = title;

34

}

35	public String getBody() {

36	return body;

37

}

38	public void setBody(String body) {

39	this.body = body;

40

}

41	public Set<keyword> getParents() {

42	return parents;

43

}

44	public void setParents(Set<keyword> parents) {

45	this.parents = parents;

46

}

47	public Set<keyword> getChildren() {

48	return children;

49

}

50	public void setChildren(Set<keyword> children) {

51	this.children = children;

52

}

53	public Date getLastModifiedTime() {

54	return lastModifiedTime;

55

}

56	public void setLastModifiedTime(Date lastModifiedTime) {

57	this.lastModifiedTime = lastModifiedTime;

58

}

59	public Date getCreateTime() {

60	return createTime;

61

}

62	public void setCreateTime(Date createTime) {

63	this.createTime = createTime;

64

}

65

}

Let's create the necessary Hibernate configurations to let Hibernate know all about our little plan to have Keyword able to join itself! Questions? Let me know!

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