Introduction Spring Boot Actuator is a powerful set of tools that empowers developers and operators to monitor and manage Spring Boot applications with ease. In this comprehensive guide, we’ll explore the key features of Spring Boot Actuator, delve into code examples, and address frequently asked questions to help you harness the full potential of this…
Double brace initialization refers to the syntax in Java where an extra set of braces are used when initializing arrays, collections, or other objects. For example: … List<String> names = new ArrayList<String>() {{ add(“John”); add(“Sarah”); add(“Mike”); }}; This syntax leverages an anonymous inner class to initialize the list inline while still creating the ArrayList instance….
Java’s ClassLoader plays a crucial role in loading classes into the Java Virtual Machine (JVM). In this guide, we explore the relationship between custom ClassLoaders and garbage collection, providing code examples and addressing frequently asked questions. Table of Contents 1. Introduction Understanding ClassLoaders in Java Java uses a hierarchical class loading mechanism. Each ClassLoader, except…
Sending a high volume of emails is a common requirement for many applications. However, care must be taken to ensure good performance and deliverability when sending bulk emails. The Spring Framework (Spring Email) provides many options to optimize and scale email delivery. In this article, we’ll explore several strategies to improve the performance of sending…
In the world of web development, building high-performance APIs is a must. As more users and requests flood in, optimizing your API’s performance becomes crucial. Spring, a popular Java framework, offers a powerful solution by introducing asynchronous programming using @Async and CompletableFuture. APIs running on Spring Boot are great, but once that traffic ramps up,…
The toString() method is fundamental to Java classes, used ubiquitously to obtain a string representation of an object. This makes the performance of toString() critical. A key optimization technique is choosing StringBuilder over string concatenation when building long strings. This comprehensive article will dive into when and why you should use StringBuilder vs concatenation inside…
Spring Framework provides powerful dependency injection capabilities, allowing you to easily manage the components and their dependencies in your application. However, it’s not uncommon to encounter situations where a field annotated with @Autowired is unexpectedly null. In this article, we’ll explore common reasons for this issue and provide solutions to help you troubleshoot and resolve…
Java 21 introduced a new built-in HTTP client API called HttpClient to replace the older HttpURLConnection. HttpClient uses an asynchronous, non-blocking approach for better performance. However, its threading model includes one controversial design choice – thread pinning. In this comprehensive guide, we’ll dig into how it works, the issues it can cause, and techniques to…
JSON (JavaScript Object Notation) is a popular and versatile data format used for data exchange in many applications. Parsing JSON in Java, or the process of extracting data from JSON, is a fundamental skill for developers. In this beginner-friendly guide, we’ll explore how to parse JSON in Java using the widely adopted Jackson library. By…
In the dynamic landscape of Java development, creating Docker images for multi-module projects can sometimes be a challenging endeavor, especially when using the latest Java version and Spring framework. In this article, we’ll explore a common issue and its solutions when dealing with Maven Jib and multi-module projects in the context of Java 21 and…
Dockerizing Java apps using Jib is a powerful way to simplify the Docker image build process. If you’re working on a multi-module Maven project and need to create Docker containers for your modules, this guide will assist you in setting up Maven Jib effectively. We’ll walk through the necessary steps, provide detailed explanations, and address…
Introduction Java 21 introduces a groundbreaking feature, “Java 21 Sequenced Collections,” within the Java Collections Framework. This innovation brings forth the SequencedCollection interface and a series of default methods that seamlessly integrate with existing collection interfaces like List, Deque, and SortedSet. Java 21 Sequenced Collections revolutionize the way you handle collections, emphasizing the importance of…
