Spring Full-Stack Practical Cases

Jul 21, 2026 · Backend Development

Cut Memory Usage by 90%: Spring Boot Streams Massive JSON from 220 MB to 22 MB

By replacing the naive List‑based deserialization with Jackson’s JsonParser streaming in Spring Boot 3.5.0, the article shows how processing ~300 k Student records can cut peak heap from 220 MB to 22 MB, avoiding OOM while filtering records on the fly.