Good 45 Java Persistent API Interview Questions List

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Java JPA - Java Persistence API [JPA] Interview Questions And Answers :
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1.What is JPA and its key components ?

2.What are the advantages of the Java Persistence API ?

3.What are some of the main features of the Java Persistence API ?

4.What is the difference between persistence.xml and hibernate.cfg.xml ?

5.What is an EntityManager ?

6.What is an Entity ?

7.Why to use JPA - Java Persistence API ?

8.What is Embeddable classes ?

9.What is Persistent Fields ?

10.What is Persistent Properties ?

11.Explain Life Cycle of a JPA Entity ?

12.What is JPQL ?

13.Example of an Entity with Embedded class ?

14.How to Insert a record mechanism using JPA ?

15.How to fetch a record using NamedQuery ?

16.Explain "@Entity,@Table" annotations ?

17.What are the different types of "Multiplicity in Entity Relationships" ?

18.Explain "@OneToOne" mapping relationship in JPA ?

19.Explain "@OneToMany" mapping relationship in JPA ?

20.Explain "@ManyToOne" mapping relationship in JPA ?

21.Explain "@ManyToMany" mapping relationship in JPA ?

22.What is the difference between "@JoinColumn" and "mappedBy" ?

23.When to override "equals() & hashcode()" method in an Entity class ?

24.Explain "Unidirectional & Bidirectional Relationships" in JPA ? When to Use ? Its Benefits ?

25.What are the different types of cascade Operations for Entities ?

26.Explain "CascadeType.ALL" for an Entity in JPA ?

27.What is "Mapped Superclasses" ? When to use it ? Its Benefits ? [@MappedSuperclass]

28.What are the different types of "Entity Inheritance Mapping Strategies" ? [SINGLE_TABLE,JOINED,TABLE_PER_CLASS]

29.Explain "Single Table per Class Hierarchy Strategy" with example ?

30.Explain "Table per Concrete Class Strategy" with example ?

31.Explain "Joined Subclass Strategy" strategy" with example ?

32.What is "Compound Primary Keys" ? Explain ?

33.Can we have an"Entity Mapped to More Than One Database Table" ? How Explain ? [@SecondaryTable]

34.What is the annotation used to denote that the field is large object ? [@Lob]

35.What if I want to use the Java Persistence API outside of the Java EE platform ?

36.What is a JPA Entity Primary Key ?

37.Explain the "Life Cycle Methods for a JPA Entity" ? [@PrePersist,@PostPersist,@PreRemove,@PostRemove,@PreUpdate,@PostUpdate,@PostLoad]

38.What is a JPA Named (Predefined) Query ?

39.What are the different types of "Generation strategies for the values of primary keys" ?
The Auto Strategy ,The Identity Strategy ,The Sequence Strategy ,The Table Strategy

40.What is Auto Generation strategy ?

41.What is Identity Generation strategy ?

42.What is Sequence Generation strategy ?

43.What is Table Generation strategy ?

44.Explain "@SequenceGenerator" in JPA ?
@SequenceGenerator(name="seq",initialValue=1;allocationSize=100)

45.Explain "Index Management" in JPA ? [@index,@indices,@unique]

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