Spring Data JPA parses a repository method's name against a defined grammar (e.g., `findBy`, `And`/`Or`, `OrderBy`, comparison keywords like `GreaterThan`/`Containing`) and translates it directly into a JPQL query at startup, mapping method parameters to query parameters in declared order — no implementation body or annotation is needed for straightforward queries, since the method signature itself fully specifies the query.

Intermediate5 min

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#Query Methods#Derived Queries

How does Spring Data JPA generate query implementations from repository method names?

Method Names Are Validated at Application Startup, Not Query Time

Spring Data JPA parses and validates every declared query-method name against the entity's actual properties when the ApplicationContext starts — a typo'd property name (referencing a field that doesn't exist on the entity) fails immediately at boot with a clear error, rather than compiling successfully and only failing the first time that specific repository method is called in production.

findByLastNameAndAgeGreaterThan(String, int) → SELECT ... WHERE last_name = ?1 AND age > ?2 — parsed straight from the method name

Derived Query Method

java

interface UserRepository extends JpaRepository<User, Long> {
    List<User> findByLastNameAndAgeGreaterThan(String lastName, int age);
    Optional<User> findByEmailIgnoreCase(String email);
}