Large file uploads work fine in development. Then somebody uploads a 2GB video in production and suddenly: memory spikes requests hang uploads fail your server becomes unstable A lot of Spring Boot file upload tutorials only show this: @PostMapping ( "/upload" ) public ResponseEntity < String > upload ( @RequestParam ( "file" ) MultipartFile file ) { return ResponseEntity . ok ( "Uploaded" ); } Enter fullscreen mode Exit fullscreen mode That works for small files. It is not enough for production systems. In this guide, I’ll show how to handle large file uploads in Spring Boot properly using: upload limits streaming clean storage structure validation production-safe practices The Real Problem with Large File Uploads Small uploads hide architectural problems. Large uploads expose them immediately.…