Senior Xiao Ying

May 8, 2026 · Backend Development

Spring Boot 4.0 with JDK 21 and Virtual Threads: Boosting Performance

Spring Boot 4.0 introduces a milestone upgrade that requires JDK 21, switches to jakarta.* packages, offers first‑class virtual‑thread support, a built‑in declarative HTTP client, native retry annotations, API versioning, and modular auto‑configuration, all aimed at higher cloud‑native performance.