Custom Constraint — 3 Technical Articles

Jan 13, 2026 · Backend Development

Master Spring Boot Validation: 10 Essential Tips for Secure APIs

This guide explains why parameter validation is crucial for Spring Boot applications and walks through ten practical techniques—including built‑in annotations, custom constraints, server‑side checks, meaningful error messages, i18n, validation groups, cross‑field validation, exception handling, testing, and client‑side considerations—to help developers build robust, secure APIs.

AnnotationsCustom ConstraintException Handling

0 likes · 14 min read

Master Spring Boot Validation: 10 Essential Tips for Secure APIs

Programmer DD

Jan 13, 2021 · Backend Development

Master Spring Validation: Advanced Techniques, Group & Nested Validation, and Custom Rules

This comprehensive guide explores Spring Validation in depth, covering basic usage, dependency setup, requestBody and requestParam validation, unified exception handling, group validation, nested and collection validation, custom constraints, programmatic checks, fail‑fast mode, and the differences between @Valid and @Validated, while revealing the underlying implementation in Spring MVC.

Bean ValidationCustom ConstraintGroup Validation

0 likes · 18 min read

Master Spring Validation: Advanced Techniques, Group & Nested Validation, and Custom Rules

Code Ape Tech Column

Oct 27, 2020 · Backend Development

Mastering JSR‑303 Validation in Spring Boot: From Basics to Custom Constraints

This article walks through the fundamentals of JSR‑303 Bean Validation in Spring Boot, explains how to add the starter dependency, lists built‑in constraint annotations, demonstrates simple, group and nested validation, shows how to capture validation errors, and guides you through creating custom constraint annotations and validators with full code examples.

Bean ValidationCustom ConstraintGroup Validation

0 likes · 18 min read

Mastering JSR‑303 Validation in Spring Boot: From Basics to Custom Constraints