Spark is a micro framework for creating web applications in Kotlin and Java 8 with minimal effort. It is a simple and expressive Java/Kotlin web framework DSL built for rapid development. Sparks intention is to provide an alternative for Kotlin/Java developers that want to develop their web applications as expressive as possible and with minimal boilerplate. With a clear philosophy Spark is designed not only to make you more productive, but also to make your code better under the influence of Spark’s sleek, declarative and expressive syntax.

Spark - A simple expressive web framework for java

Javalin is a very lightweight web framework for Kotlin and Java, inspired by Sparkjava and koa.js. Javalin is written in Kotlin with a few functional interfaces written in Java. This was necessary to provide an enjoyable and near identical experience for both Kotlin and Java developers.
<ul>
  <li>Lightweight - You don’t have to learn any advanced concepts to get started</li>
  <li>Consistent API - All handlers and mappers are void and operate on the Context (ctx)</li>
  <li>Almost identical API for both Kotlin and Java</li>
  <li>Not opinionated - A library rather than a framework (you never have to extend anything)</li>
  <li>Fully customizable embedded server (Jetty)</li>
  <li>JSON-object-mapping (via Jackson)</li>
  <li>Simple per-endpoint auth via <code class="highlighter-rouge">AccessManager</code> interface</li>
  <li>Simple static file handling</li>
  <li>Lifecycle events</li>
  <li>CookieStore - An easy way to serialize and store objects in cookies</li>
  <li>Template rendering (Velocity, Freemarker, Thymeleaf, Mustache)</li>
  <li>Markdown rendering</li>
</ul>

Javalin is a very lightweight web framework for Kotlin and Java, inspired by Sparkjava and koa.js. Javalin is written in Kotlin with a few functional interfaces written in Java. This was necessary to provide an enjoyable and near identical experience for both Kotlin and Java developers.

Javalin - A Simple REST API Library for Java / Kotlin

Restlet Framework is the leading RESTful Web API framework for Java. It has powerful routing and filtering capabilities, unified client and server Java API, developers can build secure and scalable RESTful web APIs. It is available in editions for all major platforms (Java SE/EE, Google App Engine, OSGi, GWT, Android) and offers numerous extensions to fit the needs of all developers.

Restlet - Restlet Framework for Java

RESTX is the lightweight, modular, feature rich, blazing fast, open source Java REST framework. It shares similarities with modern frameworks like Play! like hot compile and a very productive experience, but focused on REST and pure Java.
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It is focused more on Rest. This implies that it’s not a general web framework, i.e., there is no templating mechanism. It’s better use with a JavaScript framework on the client side, and you can always use any other templating mechanism to serve your pages.

RESTX is the lightweight, modular, feature rich, blazing fast, open source Java REST framework. It shares similarities with modern frameworks like Play! like hot compile and a very productive experience, but focused on REST and pure Java.

RESTX - the lightweight Java REST framework

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Spark - A simple expressive web framework for java

Javalin - A Simple REST API Library for Java / Kotlin

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RESTX - the lightweight Java REST framework

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Spark - A simple expressive web framework for java

Javalin - A Simple REST API Library for Java / Kotlin

Restlet - Restlet Framework for Java

RESTX - the lightweight Java REST framework

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