In this tutorial, you will learn how to create a new Kafka Topic in a Spring Boot application. Kafka topics can also be created automatically when a new message is sent to them. However, in production environments, topic auto-creation is usually turned off. This is why creating Kafka topics before sending messages to them is considered…
Read More Creating Kafka Topic in Spring Boot ApplicationIn this lesson, you will learn how to produce a message or how to send a message to Kafka’s topic using Kafka Producer CLI. If your topic does not exist, it is better to create a new topic first. Message with a key or without a key When sending a message to a Kafka topic,…
Read More Kafka Producer CLI – Send Message to a TopicIn this tutorial, you will learn how to delete Apache Kafka topics using the Kafka Command-line Interface(CLI). Before Deleting Kafka Topic Before deleting a Kafka topic, there are a few things you should keep in mind: Deleting a topic is permanent: Once you delete it, it is gone forever. There is no way to undo…
Read More Delete Kafka Topic TutorialIn this tutorial, you will learn how to create a new topic using Kafka Command Line Interface(CLI). 1. Open a new Terminal Window To create a new Kafka topic, using CLI you will need to use a terminal window or command-line prompt. 2. Change Directory to Kafka “bin” Folder Once a terminal window is opened,…
Read More Kafka CLI – Creating Kafka TopicsWhat is JUnit 5? JUnit 5 is actually a combination of three main elements. It’s a mix of JUnit Platform, JUnit Jupiter API, and JUnit Vintage API. Let’s break it down. JUnit Platform Think of JUnit 5 as having a solid foundation called the JUnit Platform. This platform is like the engine that gets your…
Read More What is JUnit 5? (+Video Tutorial)In this tutorial, you will learn what is Spring Cloud Vault, how to install and run HashiCorp’s Vault using three different methods: from HashiCorp website, using Homebrew, or as Docker container. What is Spring Cloud Vault? How do we store secrets safe in a distributed system? Secrets are sensitive information that you don’t want to expose…
Read More Installing and Running HashiCorp’s Vault for Spring CloudEnvironment variables are useful for configuring the behavior of an application without modifying its code. They are often used to store sensitive information such as passwords, API keys, or database credentials. However, passing environment variables to a Docker container can be tricky, especially if you want to keep them secure and avoid exposing them in…
Read More Passing Environment Variables to Docker ContainerIn this tutorial, you will learn how to return a custom error message if the conditions of the Spring Method Security are not met. To learn more about method-level security annotations read: Spring Method-Level Security with @PreAuthorize, Spring Security @Secured: Method-Level Protection, @PostAuthorize Security Annotation Example. Controller class with Spring Method Security Annotation Let’s assume…
Read More Spring Method Security: Customize Error MessageIn this tutorial, I’m going to walk you through how to execute a JUnit 5 test case from a command-line terminal without the use of Maven or Gradle. If you’re just starting out with Java or JUnit, you’re in the right place. I’ll explain everything in detail, step-by-step, so you can follow along even if…
Read More Run JUnit 5 Tests from Command Line without Maven or GradleIn this tutorial, I’m going to guide you through the process of zipping and unzipping files in Java. This is a common task in many programming and data management scenarios, and it’s a skill that can be incredibly useful in a variety of contexts. Throughout this tutorial, you’ll learn how to zip a single file,…
Read More Zip and Unzip Files in JavaProject Reactor is an open-source reactive library for building reactive applications in Java. It is part of the broader Reactive Streams initiative and provides an implementation of the Reactive Streams specification. Developed by Pivotal Software, Project Reactor has gained widespread adoption in the Java ecosystem due to its powerful abstractions and ease of use. At…
Read More Introduction to Project Reactor in JavaIn the ever-evolving world of software development, responsiveness and efficiency are paramount. Reactive Programming provides a powerful paradigm that allows you to build applications that are highly responsive, scalable, and resilient. In this tutorial, we will delve into the world of Reactive Programming in Java, exploring its key concepts and how it can benefit your…
Read More Introduction to Reactive Streams in JavaIn this tutorial, you will learn about Spring Bean Scopes, an important part of the Spring Framework. You will learn what they are, how they work, and when to use them. By the end, you’ll have a clear understanding of Spring Bean Scopes, helping you build better Spring applications. Introduction to Spring Beans In the…
Read More A Guide to Spring Bean ScopesIn this guide, I’ll show you how to create a Fat Jar with Spring Boot. Together, we’ll build a simple ‘UsersMicroservice’, then pack it into a Fat Jar. Don’t worry if you’re new, I’ll guide you step-by-step and answer your top questions along the way. Let’s get started! What is a Fat JAR? A Fat…
Read More Creating a Fat Jar App with Spring BootReactive Programming, a powerful paradigm in modern software development, revolutionizes the way we handle data and events. By embracing reactive principles, developers can build highly responsive and scalable applications. In this tutorial, we will explore the fundamentals of Reactive Programming, its benefits, common use cases, and delve into real-world examples to demonstrate its practical applications.…
Read More Introduction to Reactive Programming