Spring Full-Stack Practical Cases

Dec 8, 2025 · Backend Development

Why JPQL Projection Beats Manual Mapping and MapStruct in Spring Boot 3

A Spring Boot 3.4.2 tutorial compares four entity‑to‑DTO conversion strategies—manual mapping, MapStruct, JPQL DTO projection, and JPQL record projection—using JMH benchmarks on an H2 in‑memory database, revealing that JPQL projection is roughly three times faster than the other approaches.