Blog about programming and web technologies, scalable, high availability and tips to be more productive.https://yunielacosta.com/https://yunielacosta.com/posts/en/15-ways-to-improve-the-speed-of-your-java-application/https://yunielacosta.com/posts/en/15-ways-to-improve-the-speed-of-your-java-application/Get fifteen tips to speed up your Java applications and optimize your code for peak performance. Streamlining your architecture and utilizing new technology reduces execution time. Proper code organization and efficient algorithms ensure applications run efficiently. Configure your systems for optimal performance. Implement these tips for maximum speed.Thu, 02 Feb 2023 16:28:19 GMThttps://yunielacosta.com/posts/en/2022-10-13-web-performance/https://yunielacosta.com/posts/en/2022-10-13-web-performance/User perception of website speed is more important than load time in milliseconds. In this article, we analyze various metrics and best practices to improve user perception. Smoothness of scrolling and animations, real-time page load, and responsiveness to user interaction all affect perception.Thu, 13 Oct 2022 12:33:43 GMThttps://yunielacosta.com/posts/en/add-image-selector-flutter/https://yunielacosta.com/posts/en/add-image-selector-flutter/The image picker is a common component that we often need for user profiles and other things. How to add an image picker to flutter to select images from gallery or cameraFri, 18 Dec 2020 00:00:00 GMThttps://yunielacosta.com/posts/en/an-introduction-to-the-runtime-class-in-java/https://yunielacosta.com/posts/en/an-introduction-to-the-runtime-class-in-java/Explore Java's Runtime class: control JVM execution, manage memory, and execute OS commands. Examples and benefits for building robust and efficient apps.Sun, 19 Feb 2023 01:01:06 GMThttps://yunielacosta.com/posts/en/5-must-have-tools-for-2023-from-smart-photo-editing-to-ai-powered-copywriting/https://yunielacosta.com/posts/en/5-must-have-tools-for-2023-from-smart-photo-editing-to-ai-powered-copywriting/Maximize your productivity in 2023 with five powerful tools highlighted in this article. From smart photo editing to AI-powered copywriting, these tools simplify tasks and keep you ahead in the digital age.Fri, 10 Feb 2023 15:12:23 GMThttps://yunielacosta.com/posts/en/array-list-vs-linked-list-java-collections/https://yunielacosta.com/posts/en/array-list-vs-linked-list-java-collections/Compare ArrayList and LinkedList data structures in Java. Explore their differences in implementation, time complexity, memory usage, and guidance on when to use each based on use cases.Wed, 22 Feb 2023 21:42:35 GMThttps://yunielacosta.com/posts/en/boost-your-java-testing-with-these-7-incredible-libraries/https://yunielacosta.com/posts/en/boost-your-java-testing-with-these-7-incredible-libraries/Discover 7 Java libraries for better unit and integration testing: AssertJ, Awaitility, Mockito, Wiser, Memoryfilesystem, WireMock, and Testcontainers. Simplify development, reduce testing time, and ensure code quality.Wed, 15 Feb 2023 13:40:04 GMThttps://yunielacosta.com/posts/en/building-fullstack-web-applications-with-angular-nestjs-and-nx/https://yunielacosta.com/posts/en/building-fullstack-web-applications-with-angular-nestjs-and-nx/Angular is a top frontend framework, but to create full-stack apps, you need more. NestJS pairs well with Angular for complete web app development.Sat, 22 May 2021 23:32:13 GMThttps://yunielacosta.com/posts/en/caching-results-with-spring-boot/https://yunielacosta.com/posts/en/caching-results-with-spring-boot/Implementing a Cache with Spring is a fairly easy task, due to the ease of implementation. For this Spring provides us with a series of annotations that we will see in the rest of the tutorial.Fri, 21 Oct 2022 23:18:16 GMThttps://yunielacosta.com/posts/en/countdown-to-new-year-astronomy/https://yunielacosta.com/posts/en/countdown-to-new-year-astronomy/Combining my passions for astronomy and programming, I'm creating a website to countdown the days until the new year, with a simulation of the earth's movement.Sun, 27 Dec 2020 00:00:00 GMThttps://yunielacosta.com/posts/en/configure-proxy-global-on-linux/https://yunielacosta.com/posts/en/configure-proxy-global-on-linux/In this article I share some tips to configure the internet through a global proxy in GNU/Linux operating systems.Sun, 06 Dec 2020 00:00:00 GMThttps://yunielacosta.com/posts/en/customizing-github-profile-page/https://yunielacosta.com/posts/en/customizing-github-profile-page/You can customize your profile so that other people can get a better sense of who you are and the work you do. Tue, 11 May 2021 02:05:59 GMThttps://yunielacosta.com/posts/en/d-the-dependency-inversion-principle/https://yunielacosta.com/posts/en/d-the-dependency-inversion-principle/This article explores the Dependency Inversion Principle (DIP) in SOLID design principles, highlighting the benefits of creating flexible and easy-to-maintain code. It provides a Kotlin example for implementing DIP to achieve an adaptable codebase.Sat, 18 Mar 2023 12:07:00 GMThttps://yunielacosta.com/posts/en/differences-between-treemap-hashmap-and-linkedhashmap-in-java/https://yunielacosta.com/posts/en/differences-between-treemap-hashmap-and-linkedhashmap-in-java/This article discusses the differences between TreeMap, HashMap, and LinkedHashMap in Java. It explains the characteristics and use cases of each of these classes to help you choose the right implementation of the Map interface for your project.Sat, 18 Feb 2023 12:44:57 GMThttps://yunielacosta.com/posts/en/from-linux-to-macos-my-opinion/https://yunielacosta.com/posts/en/from-linux-to-macos-my-opinion/Switching from Linux to MacOS has limitations, such as lacking basic functions like cutting files and difficulty arranging windows on the desktop. But MacOS offers performance, a fully integrated ecosystem, and great software variety.Thu, 19 Jan 2023 20:15:00 GMThttps://yunielacosta.com/posts/en/hibernate-tutorial-dialects-in-hibernate/https://yunielacosta.com/posts/en/hibernate-tutorial-dialects-in-hibernate/Hibernate requires the configuration of a SQL dialect in order to generate appropriate SQL statements for the specified database type. The org.hibernate.dialect package contains many Dialect classes for various RDBMS.Thu, 12 Jan 2023 17:20:31 GMThttps://yunielacosta.com/posts/en/how-to-order-your-spring-boot-tests-with-junit-5/https://yunielacosta.com/posts/en/how-to-order-your-spring-boot-tests-with-junit-5/Learn how to use JUnit 5's feature for ordering test classes to run Spring Boot automated tests from unit to integration tests, with the fastest tests running first. Configure JUnit with a ClassOrderer for a predetermined order.Wed, 25 Jan 2023 21:56:01 GMThttps://yunielacosta.com/posts/en/i-the-interface-segregation-principle/https://yunielacosta.com/posts/en/i-the-interface-segregation-principle/This article explains the Interface Segregation Principle (ISP), a SOLID design principle. ISP says that a class should only implement the methods it needs. The article gives an example of a bad practice that violates ISP and a better practice that follows it by creating small, specific interfaces for each class.Fri, 17 Mar 2023 10:46:22 GMThttps://yunielacosta.com/posts/en/introduction-to-gridsome/https://yunielacosta.com/posts/en/introduction-to-gridsome/Gridsome is a Vue.js-powered, modern site generator for building the fastest possible websites for any Headless CMS, APIs or Markdown-files. Gridsome makes it easy and fun for developers to create fast, beautiful websites without needing to become a performance expert.Mon, 08 Apr 2019 00:00:00 GMThttps://yunielacosta.com/posts/en/java-developers-check-out-these-github-repositories/https://yunielacosta.com/posts/en/java-developers-check-out-these-github-repositories/Discover some of the best GitHub repositories for Java developers in this article. Learn about data structures, algorithms, Spring framework, coding style tools and more to enhance your skills.Wed, 22 Feb 2023 19:49:09 GMThttps://yunielacosta.com/posts/en/java-features/https://yunielacosta.com/posts/en/java-features/Java is a fast, secure, and versatile programming language used in a wide range of applications and websites. From laptops to datacenters, game consoles to scientific supercomputers, Java is everywhere!Mon, 10 Oct 2022 00:00:00 GMThttps://yunielacosta.com/posts/en/javascript-free-hosts/https://yunielacosta.com/posts/en/javascript-free-hosts/If you are learning how to create web pages and want to try free hosting, I offer you 6 options for you to practice. Although, you can also use them in production.Wed, 28 Sep 2022 00:00:00 GMThttps://yunielacosta.com/posts/en/l-the-liskov-substitution-principle/https://yunielacosta.com/posts/en/l-the-liskov-substitution-principle/The Liskov substitution principle ensures that subclass objects can be used interchangeably with those of the superclass, preventing unexpected program errors. Adhering to this rule simplifies code management and increases predictability.Wed, 08 Mar 2023 20:53:25 GMThttps://yunielacosta.com/posts/en/maximizing-productivity-and-alignment-with-okrs-a-guide-to-setting-and-achieving-objectives/https://yunielacosta.com/posts/en/maximizing-productivity-and-alignment-with-okrs-a-guide-to-setting-and-achieving-objectives/This article discusses how using Objectives and Key Results (OKRs) can align team and individual efforts with an organization's goals, boost productivity, and drive success. It also highlights the importance of effective communication and stakeholder involvement. The article serves as a guide to implementing OKRs.Tue, 20 Dec 2022 00:00:00 GMThttps://yunielacosta.com/posts/en/o-the-open-closed-principle-extending-behaviors-without-modifying-code/https://yunielacosta.com/posts/en/o-the-open-closed-principle-extending-behaviors-without-modifying-code/This article explains the Open-Closed Principle (OCP) of SOLID design, which advises creating flexible and maintainable code by keeping classes open to extension but closed to modification. It uses an example to show how to adhere to the OCP by defining an interface and creating separate classes for each shape.Wed, 01 Mar 2023 18:13:14 GMThttps://yunielacosta.com/posts/en/rebuilding-site-with-astro/https://yunielacosta.com/posts/en/rebuilding-site-with-astro/Astro is an innovative static site generator that focuses on static generation instead of JS framework. But, how much better is it?Tue, 13 Sep 2022 00:00:00 GMThttps://yunielacosta.com/posts/en/singleton-pattern/https://yunielacosta.com/posts/en/singleton-pattern/The Singleton pattern restricts a class's instantiation to one object, providing benefits such as global state, configuration settings, and simplified testing. It enforces a single point of access for the instance of the class and reduces the amount of code needed to maintain a single instance of an object.Thu, 02 Feb 2023 16:53:55 GMThttps://yunielacosta.com/posts/en/s-the-single-responsibility-principle/https://yunielacosta.com/posts/en/s-the-single-responsibility-principle/The Single Responsibility Principle (SRP) is a design principle promoting maintainable code. It states that each class should have only one job. This post explains its importance with code examples, resulting in more understandable and maintainable code.Wed, 01 Mar 2023 17:33:58 GMThttps://yunielacosta.com/posts/en/solid-principles-explained-building-more-maintainable-and-understandable-software/https://yunielacosta.com/posts/en/solid-principles-explained-building-more-maintainable-and-understandable-software/Learn the SOLID principles of OOP: SRP, OCP, LSP, ISP, and DIP. These guidelines help create flexible and easy-to-understand software designs, avoiding common problems.Thu, 23 Mar 2023 13:26:43 GMThttps://yunielacosta.com/posts/en/system-design-roadmap-2023-a-comprehensive-guide-to-understanding-system-design/https://yunielacosta.com/posts/en/system-design-roadmap-2023-a-comprehensive-guide-to-understanding-system-design/This guide covers system design basics, including performance, scalability, latency, throughput, consistency, availability, background jobs, load balancers, caching, and monitoring. It also recommends resources for further learning, such as books, courses, tutorials, and podcasts.Fri, 17 Feb 2023 00:36:19 GMThttps://yunielacosta.com/posts/en/thesis/https://yunielacosta.com/posts/en/thesis/This case study allowed the creation of archives in formats of spatiotemporal scientific data that can be used by several institutions that conduct research on the use of the soils. The tools developed are based on free software and can be used in different areas of application.Mon, 10 Jul 2017 00:00:00 GMThttps://yunielacosta.com/posts/en/top-10-vs-code-extension-for-2021/https://yunielacosta.com/posts/en/top-10-vs-code-extension-for-2021/Visual Studio Code is a popular code editor among developers because of its many extensions that speed up the development process. Here are 10 VS Code extensions for web developers to improve their experience and make their job easier in various ways in 2021.Tue, 25 May 2021 02:23:12 GMThttps://yunielacosta.com/posts/en/understanding-cors-in-web-development/https://yunielacosta.com/posts/en/understanding-cors-in-web-development/This article explains CORS (Cross-Origin Resource Sharing) - a security feature built into web browsers that allows web pages to make XMLHttpRequests to another domain. It covers what CORS is, why it's important, and how it works. The article emphasizes the importance of understanding CORS for building modern web applications that require cross-domain requests.Mon, 03 Apr 2023 08:06:22 GMThttps://yunielacosta.com/posts/en/understanding-oauth-oidc-and-saml-authentication-vs-authorization/https://yunielacosta.com/posts/en/understanding-oauth-oidc-and-saml-authentication-vs-authorization/This article explains the distinctions between OAuth, OIDC, and SAML, outlining their unique features and applications. By breaking down these standards, readers can make informed decisions about which one to use for their authentication and authorization needs.Wed, 29 Mar 2023 08:55:38 GMThttps://yunielacosta.com/posts/en/vue-3-with-typescript-and-decorators/https://yunielacosta.com/posts/en/vue-3-with-typescript-and-decorators/I use Typescript and decorator libraries for VueJS. This allows me to use a class syntax that's easier to read. I'll show you how to build a counter component that can increment and decrement.Sun, 30 May 2021 19:54:13 GMT