Jpa Interview Questions And Answers

Jpa Interview Questions list for experienced

  1. What is the Java Persistence API?
  2. What is the object-relational mapping?
  3. What are the advantages of JPA?
  4. What are the embeddable classes?
  5. List some ORM frameworks.
  6. What are the steps to persist an entity object?
  7. What are the steps to insert an entity?
  8. What are the different directions of entity mapping?
  9. What are the different types of entity mapping?
  10. What is an orphan removal in mappings?
  11. Explain persistence life cycle of an object?
  12. What are the different types of identifier generation?
  13. What are the properties of an entity?
  14. What is the role of Entity Manager in JPA?
  15. What are the constraints on an entity class?
  16. What is the purpose of Java collections in JPA?
  17. What type of objects can be stored in the JPA collections mapping?
  18. What type of collections can be used in JPA?
  19. What is the purpose of cascading operations in JPA?
  20. What are the types of cascade supported by JPA?
  21. What is JPQL?
  22. What are the features of JPQL?
  23. What is the Criteria API?

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Top Jpa interview questions and answers for freshers and experienced

What is Jpa ?

Answer : The Java Persistence API (JPA) is a Java specification for accessing, persisting, and managing data between Java objects/classes and a relational database. It is part of the EJB 3.0 specification and is the industry standard approach for Object to Relational Mapping (ORM).

Questions : 1 :: What is the Java Persistence API?

The Java Persistence API (JPA) is the specification of Java that is used to persist data between Java object and relational database. JPA acts as a bridge between object-oriented domain models and...View answers

Questions : 2 :: What is the object-relational mapping?

The object-relational mapping is a mechanism which is used to develop and maintain a relationship between an object and the relational database by mapping an object state into the database column. It...View answers

Questions : 3 :: What are the advantages of JPA?


The advantages of JPA are given below. The burden of interacting with the database reduces significantly by using JPA. The user programming becomes easy by concealing the O/R mapping and database...View answers

Questions : 4 :: What are the embeddable classes?

Embeddable classes represent the state of an entity but do not have a persistent identity of their own. The objects of such classes share the identity of the entity classes that owns it. An Entity...View answers

Questions : 5 :: List some ORM frameworks.

Following are the various frameworks that function on ORM mechanism:...View answers

Questions : 6 :: What are the steps to persist an entity object?


The following steps are performed to persist an entity object. Create an entity manager factory object. The EntityManagerFactory interface present in java.persistence package...View answers

Questions : 7 :: What are the steps to insert an entity?

We can easily insert the data into the database through the entity. The EntityManager provides persist() method to add records. The following steps are used to insert the record into the...View answers

Questions : 8 :: What are the different directions of entity mapping?

The direction of a mapping can be either unidirectional or bidirectional. In unidirectional mapping, only one entity can be mapped to another entity, whereas in bidirectional mapping each entity can...View answers

Questions : 9 :: What are the different types of entity mapping?


Following are the types of object-relational mapping: - One-to-one mapping: The one-to-one mapping represents a single-valued association where an instance of one entity is associated with an...View answers

Questions : 10 :: What is an orphan removal in mappings?

If a target entity in one-to-one or one-to-many mapping is removed from the mapping, then remove operation can be cascaded to the target entity. Such target entities are known as orphans, and the...View answers

Questions : 11 :: Explain persistence life cycle of an object?

In persistence life cycle, the object lies in the following states: - Transient - The object is called to be in the transient state when it is just declared by using the new keyword. When an...View answers

Questions : 12 :: What are the different types of identifier generation?

Following are the types of id generation strategy required to specify with @GeneratedValue annotation: - Automatic Id generation - In this case, the application doesn't care about the kind of id...View answers

Questions : 13 :: What are the properties of an entity?

Following are the properties of an entity that an object must have: - Persistability: An object is called persistent if it is stored in the database and can be accessed anytime. Persistent...View answers

Questions : 14 :: What is the role of Entity Manager in JPA?

An entity manager is responsible for the following operations. The entity manager implements the API and encapsulates all of them within a single interface. The entity manager is used to read,...View answers

Questions : 15 :: What are the constraints on an entity class?

An entity class must fulfill the following requirements: The class must have a no-argument constructor. The class can't be final. The class must be annotated with @Entity annotation. The class...View answers

Questions : 16 :: What is the purpose of Java collections in JPA?

In JPA, Java collections are used to persist the object of wrapper classes and String.

Questions : 17 :: What type of objects can be stored in the JPA collections mapping?

Following are the type of objects that JPA allows to store: - Basic...View answers

Questions : 18 :: What type of collections can be used in JPA?

To store multivalued entity associations and a collection of objects, following types of Java collections is used:...View answers

Questions : 19 :: What is the purpose of cascading operations in JPA?

If we apply any task to one entity then using cascading operations, we make it applicable to its related entities also.

Questions : 20 :: What are the types of cascade supported by JPA?

Following is the list of cascade type: - PERSIST: In this cascade operation, if the parent entity is persisted then all its related entity will also be persisted. MERGE: In this cascade...View answers

Questions : 21 :: What is JPQL?

The Java Persistence Query language (JPQL) is a part of JPA specification that defines searches against persistence entities. It is an object-oriented query language which is used to perform database...View answers

Questions : 22 :: What are the features of JPQL?

Some of the essential features of JPQL are: - It is simple and robust. It is a platform-independent query language. JPQL queries can be declared statically into metadata or can also be...View answers

Questions : 23 :: What is the Criteria API?

The Criteria API is a specification that provides type-safe and portable criteria queries written using Java programming language APIs. It is one of the most common ways of constructing queries for...View answers
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