💡 Pick Jetty for a more mature Java server ecosystem with strong embedded deployment and HTTP protocol support.
Jetty is a widely used open-source web server and servlet container.
Best Undertow Alternatives ranked by AI · updated Aug 2026
Undertow is a lightweight, embeddable Java web server and Servlet container for developers building high-performance applications. It combines non-blocking I/O with a flexible handler architecture and supports both blocking and asynchronous request processing.
Top 6 Undertow alternatives
2
Tomcat
Apache Software Foundation
💡 Pick Tomcat for maximum Servlet compatibility, documentation, and operational familiarity.
Tomcat is an open-source Java Servlet container and web server for hosting Java web applications. It is best known for broad Servlet...
Pros
- Broader adoption and community support than Undertow
- Excellent compatibility with conventional Servlet applications
- Extensive documentation, tooling, and operational knowledge
Cons
- Less focused on non-blocking application design than Undertow
- Heavier and less handler-oriented for minimal embedded services
- JSP support adds complexity when only APIs are needed
💡 Pick Netty when you need low-level control, custom protocols, or highly concurrent event-driven networking.
Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.
💡 Pick Vert.x if you want Undertow-like asynchronous serving plus a broader reactive and polyglot application toolkit.
Vert.x is a toolkit for building reactive applications on the JVM.
5
💡 Pick Grizzly for Jakarta EE alignment and configurable non-blocking networking inside Java infrastructure.
Grizzly is a NIO and Web framework for building scalable network applications.
Pros
- Scalability
- Offers Web framework
Cons
- Less active development
- Documentation can be sparse
6
💡 Pick Ktor for Kotlin-first asynchronous services with coroutine-based APIs and modern application composition.
Ktor is a framework for building asynchronous servers and clients in Kotlin.
Pros
- Lightweight
- Scalable
Cons
- Steep learning curve
- Less mature ecosystem
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