Apache TomEE, often referred to as “Tommy,” is an application server that is fully certified for Jakarta EE 9.1 and is built upon Apache Tomcat, originating from a standard Apache Tomcat zip file. The process begins with Apache Tomcat, followed by the addition of necessary libraries, culminating in a packaged version that incorporates EE functionalities, thus creating TomEE. This server is stable and production-ready, with Apache TomEE 8.0 implementing Java EE 8/Jakarta EE 8 and maintaining support for the javax namespace, while operating on Java 8 or later versions. It is primarily compliant with the Jakarta EE 9.1 web profile and supports the new jakarta namespace, functioning seamlessly on Java 11 or newer. Apache TomEE is available in four variations: web profile, MicroProfile, Plus, and Plume. The web profile of Apache TomEE provides essential services such as servlets, JSP, JSF, JTA, JPA, CDI, bean validation, and EJB Lite. The MicroProfile variant enhances the server with additional support for MicroProfile features, while the Plus and Plume editions expand capabilities to include JMS, JAX-WS, and other functionalities. Overall, Apache TomEE is a versatile and robust solution for developers looking to leverage Jakarta EE in their applications.