Spring Archives - Igor Venturelli

Exception Handling Like a Pro in Spring Boot REST APIs

In a perfect world, your REST API always works flawlessly. But in the real world? Things break.

How your application handles those failures can define the difference between a developer’s dream and a support team’s nightmare.

In this post, you’ll learn how to implement robust, consistent, and professional-grade exception handling in Spring Boot. We’ll go beyond catching errors—we’ll turn exceptions into structured, debuggable, and meaningful responses.

Building Robust APIs with Spring Boot and Validation Annotations

When building APIs, the hardest bugs often come from the easiest oversight: trusting user input. If your controller accepts data as-is and only relies on business logic to catch errors, you’re putting too much responsibility on the wrong layer.

Validation isn’t a nice-to-have. It’s a contract.

Understanding Dependency Injection in Spring: Field vs Constructor vs Setter

Dependency Injection (DI) is at the heart of the Spring Framework. It promotes loose coupling and easier unit testing by decoupling object creation from object usage. In Spring, there are three main ways to inject dependencies into a class: field injection, setter injection, and constructor injection. While all three are supported, each has its own implications for code readability, testability, and maintainability.

What Is a DTO? (And Why You Shouldn’t Return Your Entities in Spring Boot)

When building REST APIs with Spring Boot, it’s common to see beginners return entities directly from their controllers. At first glance, this seems fine—the data flows, the response looks right, and everything “just works.”

But what happens when your entity evolves? When sensitive fields accidentally get exposed? Or when lazy-loaded relationships break your JSON?

Getting Started with Spring Boot: Build a Task Manager App from Scratch

Spring Boot is the industry-standard framework for building modern Java applications. It dramatically reduces boilerplate code, accelerates development, and is battle-tested for microservices and monoliths alike. If you’re new to the Spring ecosystem, this post will walk you through everything you need to start building.

Spring Boot Profiles: Managing Multiple Environments Like a Pro

Learn how to manage multiple environments in Spring Boot using profiles, properties, and YAML configurations

When developing enterprise applications with Spring Boot, managing multiple environments is a necessity. You need different configurations for development, testing, staging, and production, but hardcoding settings or maintaining separate codebases is a disaster waiting to happen.

Protecting Your Spring Boot Application with OAuth2 Resource Server and Auth0

Secure your Spring Boot API with OAuth2 Resource Server and Auth0, using JWT authentication for protection

Security is non-negotiable in modern application development. As APIs become the backbone of digital services, protecting them with robust authentication and authorization mechanisms is critical. OAuth2 has become the de facto standard for securing APIs, and when combined with an identity provider like Auth0, it provides a scalable and secure solution for managing access.

Mastering Request Interception in Spring Boot: Filters vs. Interceptors

Learn the key differences between Filters and Interceptors in Spring Boot and when to use each

When building REST APIs and web applications with Spring Boot, request interception is often necessary to handle authentication, logging, security, request transformation, or other cross-cutting concerns. Spring Boot provides two powerful mechanisms for this: Filters and Interceptors.

Handling Exceptions in Spring Boot Applications

Master Spring Boot exception handling: global handlers, custom errors, and best practices for secure, user-friendly apps

Exception handling is a fundamental aspect of building resilient applications, and in Spring Boot, it can be both robust and elegant when done right. Poor exception management not only leads to confusing user experiences but also opens doors to potential vulnerabilities. Let’s explore how to manage exceptions effectively in Spring Boot, emphasizing global exception handling, custom error responses, and some best practices to ensure clarity and security.

Testing Spring Boot Applications: An Introduction to Unit and Integration Testing

Learn unit and integration testing for Spring Boot apps with JUnit, Mockito, and Spring Boot’s testing tools in this beginner-friendly guide

Testing is a critical part of modern software development, ensuring that your application works as expected while minimizing bugs. In Spring Boot, testing is both powerful and straightforward, thanks to robust support for unit and integration testing. Whether you’re verifying business logic with unit tests or ensuring the interplay of components with integration tests, understanding the fundamentals is essential for building reliable applications.