Introduction OpenSSL is a versatile open-source toolkit that provides support for Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols. It is widely used for cryptographic functions, including generating and managing certificates, creating secure connections, and encrypting data. In this tutorial, we'll explore some common OpenSSL commands and use cases with practical examples.…
Introduction Keytool is a command-line utility included with the Java Development Kit (JDK) that allows users to manage cryptographic keys, X.509 certificates, and certificate signing requests. The cacerts file is the default keystore file containing trusted certificate authorities (CAs) in Java. In this tutorial, we'll cover the basics of using Keytool to manage certificates…
Introduction: Spring Boot Shell is a powerful and extensible command-line interface (CLI) tool that enhances the development experience for Spring Boot applications. It provides a convenient way to interact with your Spring Boot projects, allowing you to execute commands, explore configurations, and manage application components efficiently. In this guide, we will walk through the…
Introduction Hexagonal Architecture, also known as Ports and Adapters architecture or simply the Onion Architecture, is a design pattern that aims to create a loosely coupled and easily maintainable software system. The core idea is to separate the business logic from external concerns, such as databases, user interfaces, and external services. In this tutorial,…
Flyway is a database migration tool that helps manage database changes in a structured and version-controlled way. Spring Boot, on the other hand, is a popular framework for building Java-based, production-grade applications. Prerequisites: Basic knowledge of Spring Boot. Familiarity with relational databases (e.g., MySQL, PostgreSQL). Step 1: Create a Spring Boot Project You can…
Spring Security in Spring Boot 3 provides a robust security framework that can be easily integrated into your application, even without using a custom login page or a database. This guide will walk you through the process of setting up Spring Security in a Spring Boot 3 application with in-memory authentication, using default login…
Configuring a Spring Cloud Config Server to read configuration from a GitHub repository, using @RefreshScope to refresh beans dynamically, and leveraging Spring Boot Actuator for monitoring and refreshing can be a powerful combination. Let's go through a step-by-step tutorial. Step 1: Setup GitHub Repository for Configuration Create a GitHub Repository: Create a new GitHub…
Spring Cloud Eureka is a service registry that allows microservices to register themselves and discover other services in the system. Prerequisites: Java Development Kit (JDK) installed (at least version 8) Maven installed IDE (such as IntelliJ or Eclipse) Basic understanding of Spring Boot and microservices architecture https://youtu.be/SxOnIO8G7Gc Step 1: Create a Spring Cloud Eureka…
Prerequisites: Java Development Kit (JDK) 8 or later installed Maven installed Spring Boot IDE or any preferred IDE Step 1: Create Eureka Server Create a new Spring Boot project with the following dependencies: Eureka Server Open the src/main/resources/application.properties file and configure the Eureka server: spring.application.name=eureka-server server.port=8761 eureka.client.register-with-eureka=false eureka.client.fetch-registry=false Add the @EnableEurekaServer annotation to your…
We'll create two simple microservices and use Zuul as an API gateway to route requests, and Eureka for service discovery. I'll also demonstrate how to implement pre-filters, post-filters, and error-filters in Zuul. Prerequisites: JDK 8 or later installed Maven installed Basic knowledge of Spring Boot Step 1: Create Eureka Server Create a new Spring…