# Embedded Servlet Containers in SpringBoot: Jetty, Tomcat, Undertow and more

!!! info "Architectural Context"
    Detailed reference for Embedded Servlet Containers in SpringBoot: Jetty, Tomcat, Undertow and more in the context of Developer Ecosystem.

## Standard Reference

  - [Comparing Embedded Servlet Containers in Spring Boot](https://www.baeldung.com/spring-boot-servlet-containers)  <span class='md-tag md-tag--info'>[COMMUNITY-TOOL]</span>
  - [Tomcat vs. Jetty vs. Undertow: Comparison of Spring Boot Embedded Servlet' Containers](https://examples.javacodegeeks.com/enterprise-java/spring/tomcat-vs-jetty-vs-undertow-comparison-of-spring-boot-embedded-servlet-containers)  <span class='md-tag md-tag--info'>[COMMUNITY-TOOL]</span>

## Platform Engineering

### Application Servers

#### Migration

  - **(2021)** [Apache Tomcat migration tool for Jakarta EE](https://github.com/apache/tomcat-jakartaee-migration) <span class='md-tag md-tag--info'>⭐ 188</span> <span class='md-tag md-tag--warning'>[JAVA CONTENT]</span> 🌟🌟 <span class='md-tag md-tag--info'>[LEGACY]</span> — A command-line utility designed to automatically migrate legacy Java EE 8 web applications to modern Jakarta EE (9+) architectures. It translates package namespaces from `javax.*` to `jakarta.*` in binaries and source code.
#### Web Servers

  - **(2026)** [Undertow](http://undertow.io) <span class='md-tag md-tag--warning'>[JAVA CONTENT]</span> <span class='md-tag md-tag--critical'>[ADVANCED LEVEL]</span>  <span class='md-tag md-tag--info'>[COMMUNITY-TOOL]</span> — A highly performant, modular web server designed by Red Hat. Written in Java, it features non-blocking, asynchronous capabilities, functioning as a powerful, lightweight container engine for high-density microservices.

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