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AWS Local Authentication: Understanding Your Options and Using IAM User Long-Term Credentials Responsibly
When you’re working with AWS as a backend engineer — especially with Java and Spring Boot stacks — there will inevitably come a moment when you need to run commands against your AWS resources using the AWS Command Line Interface (CLI) or AWS SDKs. And that moment comes with a crucial question: “How do I…
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How to Securely Connect Your Spring Boot App to PostgreSQL with AWS Secrets Manager — No More Hardcoded Credentials
Hardcoding database credentials is a practice we all want to avoid — yet it still happens. With Spring Boot and AWS Secrets Manager, you can eliminate plain-text secrets in your application.properties while keeping your configuration simple and flexible.
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How to Connect Spring Boot to PostgreSQL Using Spring Data JPA
PostgreSQL is a production-grade relational database system widely used across modern enterprise and microservice architectures. If you’re building a Spring Boot application, connecting it to PostgreSQL isn’t just a matter of adding a dependency—it’s about configuring it the right way from day one. This guide walks you through how to connect a Spring Boot application…
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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…
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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.
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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…
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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?
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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.
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Spring Boot Profiles: Managing Multiple Environments Like a Pro
Learn how to manage multiple environments in Spring Boot using profiles, properties, and YAML configurations
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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