![]() When it comes to dependency management and build tools on Java projects, there are two mainstream solutions to choose from: Gradle and Maven. "Embedding Tomcat 8 in Spring 5 apps is easy!" That's why we will learn how to embed Tomcat 8, the most popular Java server, on Spring applications. The application is guaranteed to be run in the correct server version, mitigating issues.Īlso, as this approach fits perfectly in the microservices architecture that is eating the software development world, it makes sense to embed application servers.The responsibility for running the application isn’t spread across different teams.All dependencies of the application are declared explicitly in the application code.To run a new instance of the application, it is just a matter of executing a single command.What triggered this change is that the new approach has many advantages. That is, they started creating jar (Java ARchive) files that are executable and that starts the server programmatically. Instead of shipping applications that had to be deployed on running servers, they started shipping applications that contain the server inside the bundle. For the last couple of years, developers around the world started changing this paradigm. These files, after being bundled, were deployed on application servers (like Tomcat, WildFly, WebSphere, etc.) that were already up and running on production servers. For a long time, Java developers shipped their applications as war (Web ARchive) and ear (Enterprise ARchive) files. Why Embedded Tomcat 8įirst of all, let's understand what embedded means. ![]() They decided to take an opinionated view of the Spring platform and third-party libraries so we can get started with minimal work. This is why the team responsible for Spring decided to create a new project called Spring Boot.Īs described in the official site of the Spring Boot framework, this framework makes it easy to create stand-alone, production-grade Spring based applications that "just run". As this architecture relies on multiple applications, each one specialized in a particular subject, using a framework that is hard to setup was something that developers were starting to avoid. Nowadays, many companies around the world are relying more on the microservices architecture and its benefits. However, this paradigm is getting outdated. In scenarios like that, having these huge configuration files and a hard process to set up a new project was not a problem. Therefore, it was quite common to know companies that had only one or two applications to support their daily operations. This kind of application usually supports many different areas and solves a wide variety of problems inside companies. This was not a big problem as most of the applications out there were monoliths. In the past, Spring was known for being hard to set up and for depending on huge configuration files. Besides that, Spring provides extensive and up-to-date documentation that covers the inner workings of the framework.Īs such, when starting a new Java project, Spring is an option that must be considered. For example, the framework contains more than 11k forks on GitHub and more than 120k questions asked on StackOverflow are related to it. Developers using Spring can count on a huge, thriving community that is always ready to help. Spring is the most popular framework available for the Java platform. This GitHub repository contains a branch called complete with the final code that we will have after following the steps described here. We will start from an empty directory and will analyze each step needed to create an application that is distributed as an über/fat jar. TL DR: In this article, we are going to learn how to use Gradle to structure a Spring 5 project with Tomcat 8 embedded.
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