WildFly
WildFly is an open-source, lightweight, modular, and fast application server written in Java, implementing the Jakarta EE (formerly Java EE) specification. It provides a runtime environment for deploying and managing enterprise Java applications, including web services, EJBs, and web applications. Originally known as JBoss AS, it was renamed to WildFly in 2013 to reflect its community-driven development under the JBoss project.
Developers should learn and use WildFly when building and deploying enterprise Java applications that require a robust, standards-compliant server with features like clustering, high availability, and transaction management. It is particularly useful for projects leveraging Jakarta EE technologies such as CDI, JPA, and JAX-RS, and is ideal for scenarios where modularity and performance are critical, such as in microservices architectures or large-scale enterprise systems.