Spring Validation Deep Knowledge : Use with technology: for comprehensive documentation. Jakarta vs Javax Namespace Spring Boot 3.x / Spring 6.x uses Jakarta EE 10 with package: | Spring Boot | Jakarta EE | Package | |-------------|-----------|---------| | 3.x+ | 10 | | | 2.x | 8 | | --- Request DTO Validation Controller with Validation Custom Validator Cross-Field Validation Validation Groups Global Exception Handler Common Validation Annotations | Annotation | Purpose | |------------|---------| | | Not null | | | Not null/empty/whitespace (String) | | | Not null/empty (Collection, String) |…