This article delves into the similarities and differences between the findBy and findOneBy prefixes in Spring Data JPA. It explores the concept of derived query methods, provides code examples, and explains the exception thrown by findBy queries when the result size doesn't match expectations.

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Derived Query Methods in Spring Data JPA often get praised for their derived query methods feature. Derived query methods offer a way to derive specific queries from method names. Spring Data decides whether to return one or many objects by looking at the return type.

Difference Between findBy and findOneBy in Spring Data JPA

4. IncorrectResultSizeDataAccessException