Keeping sensitive data secure is essential, but it isn’t that easy in today’s world. If you are using the Spring Boot application and want to encrypt your credentials, such as DB passwords, server information, or personal data then the simplest way is to use Jasypt. What is Jasypt? Jasypt (Java Simplified Encryption) is a Java…
Read More Spring Boot Password Encryption Using JasyptIn this Swift tutorial, I’ll show you how to add new functionality to existing Swift classes using class extensions. It’s a powerful feature in Swift that lets you add your own methods or computed properties to already-defined classes, making them more versatile. Let’s start with a very simple example. Creating a Simple Extension In Swift,…
Read More Swift Class Extension ExplainedIn this tutorial, you will learn how to generate a custom JSON Web Token(JWT) and how to add and validate custom JWT Claims using the io.jsonwebtoken library. The JWT token generated in this tutorial will be signed with a SecretKey, making it secure and tamper-proof. Also, this tutorial assumes you have prior knowledge of creating…
Read More Generate JWT. Add and Validate Custom Claims.In this tutorial, I want to share with you how to add or update the configuration of an existing Kafka topic. You may need to update the configuration of an existing Kafka topic when you want to change the behaviour of the topic or when you want to optimize the performance of your Kafka cluster.…
Read More Updating Kafka Topic ConfigurationIn this lesson, you will learn how to consume messages or how to read messages from Apache Kafka topic using Kafka Consumer Command Line Interface(CLI). To learn how to produce or send messages to Kafka topic, please read the following tutorial: Kafka Producer CLI – Produce/Send message to Kafka topic. Consuming Messages From the Beginning…
Read More Kafka Consumer CLI – Consume/Read from Kafka TopicIn 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 – Produce/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 Java
