Most of what I write is on TheServerSide.
If you want the executive version with minimal IT grief here it is. Tomcat is a lightweight servlet container that handles HTTP requests and servlets with the efficiency of a trained courier. JBoss also known as WildFly is a full Java application server that brings EJB JMS transactions clustering and a management console to the party. Tomcat favors fast boot times lower memory use and simple deployments. JBoss favors built in enterprise services that reduce coding work when you actually need transactions or distributed messaging.
Tomcat focuses on servlets JSP and the servlet container APIs. You can bolt on session management security and other bits but by default it keeps things small and predictable. WildFly JBoss includes full Java EE features and admin tooling. If your app depends on EJB or integrated JMS it saves you from reinventing the wheel.
Tomcat usually eats far less RAM and boots faster. That makes it ideal for dense containerized deployments and microservices where startup time matters. JBoss runs many services by default which raises memory use and increases startup time. You can tune WildFly and disable subsystems but expect a larger baseline.
Tomcat has fewer moving parts which means fewer ways for things to go wrong. Deploy a WAR or run a Spring Boot jar and carry on. JBoss gives you powerful enterprise capabilities but with more configuration and a steeper learning curve. If you enjoy XML or complex management consoles then great, otherwise plan for some ops work.
For raw servlet throughput simple workloads often favor Tomcat. When enterprise features like distributed transactions or heavy JMS traffic are required JBoss can perform better under realistic load because it handles those concerns natively. The only honest answer is to benchmark with representative workloads and not just one synthetic test.
Keep Docker images thin for Tomcat and rely on the framework for production features when possible. For WildFly disable unused subsystems and tune JVM memory settings. Use health checks and representative load tests. If your CI pipeline makes you cry try packaging a minimal runtime first and add features only when they are required.
Tomcat for speed and efficiency. JBoss WildFly for integrated enterprise services and complex transactional needs. Both are mature and battle tested so pick based on actual requirements not marketing fear. And yes you will need to benchmark before you bet the farm on one choice.
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This is a dedicated watch page for a single video.