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…
The @Autowired annotation is one of the most popular and useful features of the Spring framework. By automatically injecting bean dependencies, it eliminates the need for manual lookup and wiring of beans. However, some questions remain around its performance impact. In this article, we’ll take an in-depth look at how @Autowired works under the hood…
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…
