Is JPA a framework?

While some of the other covered frameworks "may" be standards-based (built on standards), the Java object-relational mapping persistence framework that is itself a standard is the Java Persistence API. There is a one-way dependency between EJB 3.0 and JPA.
A.

Why do we need JPA?

Java Persistence API (JPA) Data Persistence is a means for an application to persist and retrieve information from a non-volatile storage system. Persistence is vital to enterprise applications because of the required access to relational databases.
  • What is meant by persistent class in Java?

    Hibernate - Persistent Class. Java classes whose objects or instances will be stored in database tables are called persistent classes in Hibernate. Hibernate works best if these classes follow some simple rules, also known as the Plain Old Java Object (POJO) programming model.
  • What is a persistent object in Java?

    Persistent objects are instances of POJO classes that you create that represent rows in the table in the database. According to hibernate-doc an instance of POJO class representing table in database goes through 3 states of which persistent is one of them.
  • What is meant by lazy loading in hibernate?

    Lazy setting decides whether to load child objects while loading the Parent Object.You need to do this setting respective hibernate mapping file of the parent class.Lazy = true (means not to load child)By default the lazy loading of the child objects is true. Lazy initialization is a performance optimization.
B.

What is the JPA?

The Java Persistence API (JPA) is a Java specification for accessing, persisting, and managing data between Java objects / classes and a relational database. JPA was defined as part of the EJB 3.0 specification as a replacement for the EJB 2 CMP Entity Beans specification. JPA also requires a database to persist to.
  • What is the EJB?

    Enterprise JavaBeans (EJB) is one of several Java APIs for modular construction of enterprise software. EJB is a server-side software component that encapsulates business logic of an application.
  • What is JPA and Eclipselink?

    Popular implementations are Hibernate, EclipseLink and Apache OpenJPA. The reference implementation of JPA is EclipseLink. The JPA implementation is typically called persistence provider. The mapping between Java objects and database tables is defined via persistence metadata.
  • What is the meaning of entity in Java?

    An entity is a lightweight persistence domain object. Typically an entity represents a table in a relational database, and each entity instance corresponds to a row in that table. The primary programming artifact of an entity is the entity class, although entities can use helper classes.
C.

What is hibernate and what is it used for?

Hibernate ORM (Hibernate in short) is an object-relational mapping tool for the Java programming language. It provides a framework for mapping an object-oriented domain model to a relational database. Hibernate also provides data query and retrieval facilities.
  • What does hibernate do?

    Hibernation is a power-saving state designed primarily for laptops. While sleep puts your work and settings in memory and draws a small amount of power, hibernation puts your open documents and programs on your hard disk and then turns off your computer.
  • What is meant by spring and hibernate?

    Hibernate is a persistence framework and is used to persist Java objects in a relational database. Spring can be used to wire all this together and to provide declarative transaction management.
  • What is meant by lazy loading in hibernate?

    Lazy setting decides whether to load child objects while loading the Parent Object.You need to do this setting respective hibernate mapping file of the parent class.Lazy = true (means not to load child)By default the lazy loading of the child objects is true. Lazy initialization is a performance optimization.

Updated: 19th September 2018

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