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JPA cheat sheet & developer notes

JPA cheat sheet and 2 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · JPA

Entities, EntityManager & the Persistence Context

Entities, EntityManager & the Persistence Context. A Specification, Not an Implementation. JPA defines a standard set of interfaces/annotations for mapping Java objects to a relational database, without itself being a co…

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02 · JPA

Relationships, JPQL, Fetching & Real-World Tradeoffs

Relationships, JPQL, Fetching & Real-World Tradeoffs. Relationships & Fetch Strategy. @Entity public class Customer { @OneToMany(mappedBy = "customer", fetch = FetchType.LAZY) private List<Order> orders; }. @OneToMany/@M…

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Concepts to know for JPA

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Optimistic vs Pessimistic LockingStop concurrent writers overwriting each other: lock the row before reading, or check a version on write. When each wins and how to build both.Intermediate·13 min

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