Apache TomEE, pronounced “Tommy”, is an all-Apache Jakarta EE 9.1 certified application server extends Apache Tomcat that is assembled from a vanilla Apache Tomcat zip file. We start with Apache Tomcat, add our jars, and zip up the rest. The result is Tomcat plus EE features - TomEE.

Documentation: https://tomee.apache.org/tomee-9.0/docs
Examples : https://tomee.apache.org/tomee-9.0/pt/examples/
Javadoc : https://tomee.apache.org/tomee-9.0/javadoc