What is the difference between JPA, Hibernate, and Spring Data JPA?

Separates the persistence specification, its ORM implementation, and Spring's repository abstraction while keeping generated SQL visible.

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TL;DR

JPA, now Jakarta Persistence, is the standard API and mapping specification for object-relational persistence in Java. Hibernate ORM is a JPA implementation and also provides features beyond the standard. Spring Data JPA sits above JPA and generates repository implementations, query methods, and integrations from interfaces. A typical Spring application uses Spring Data repositories, which delegate through JPA to Hibernate, which ultimately generates SQL for the database.

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JPA contracts, Hibernate implementation behavior, Spring Data repositories, portability, and abstraction boundaries.

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Core answer
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Overview
They are related layers, not three interchangeable names for the same library.
JPA, now Jakarta Persistence, is the standard API and mapping specification for object-relational persistence in Java. Hibernate ORM is a JPA implementation and also provides features beyond the standard. Spring Data JPA sits above JPA and generates repository implementations, query methods, and integrations from interfaces. A typical Spring application uses Spring Data repositories, which delegate through JPA to Hibernate, which ultimately generates SQL for the database.
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Stronger answer
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The layers remove repetitive code but do not remove the need to understand persistence contexts, transactions, mappings, and SQL. A repository method can look like a collection operation while performing several database round trips. I prefer standard JPA behavior when it meets the requirement, then use a Hibernate-specific feature deliberately when its benefit outweighs portability. For query-heavy paths, JDBC, jOOQ, or explicit SQL may be clearer than forcing every operation through an entity model.

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Calling JPA a concrete ORM implementation.
Assuming Spring Data replaces Hibernate or the database.
Treating repository syntax as evidence that a query is efficient.

What is the difference between JPA, Hibernate, and Spring Data JPA?

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