Quarkus is a Cloud Native, Container First framework for writing Java applications. A Kubernetes Native Java stack tailored for GraalVM &amp; OpenJDK HotSpot, crafted from the best of breed Java libraries and standards. Quarkus tailors your application for GraalVM and HotSpot. Amazingly fast boot time, incredibly low RSS memory (not just heap size!) offering near instant scale up and high density memory utilization in container orchestration platforms like Kubernetes. It allows developers to automatically generate Kubernetes resources including building and deploying container images without having to manually create YAML files.
Quarkus is based on a&nbsp;<a href="https://quarkus.io/version/main/guides/quarkus-reactive-architecture" target="_blank" rel="noopener">reactive core</a> allowing your application to mix reactive and imperative components. It helps to compose asynchronous operations and complete the result when everything is done without blocking the I/O threads using <a href="https://quarkus.io/version/main/guides/mutiny-primer" target="_blank" rel="noopener">Mutiny Reactive API</a>.&nbsp;&nbsp;

Quarkus is a Cloud Native, Container First framework for writing Java applications. A Kubernetes Native Java stack tailored for GraalVM & OpenJDK HotSpot, crafted from the best of breed Java libraries and standards. Quarkus tailors your application for GraalVM and HotSpot. Amazingly fast boot time, incredibly low RSS memory (not just heap size!) offering near instant scale up and high density memory utilization in container orchestration platforms like Kubernetes. 

Quarkus - Supersonic Subatomic Java

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

Light 4j is a fast, lightweight and cloud native microservices framework. Light means lightweight, lighting fast and shed light on how to program with modern Java SE. It is 44 times faster than the most popular microservices platform Spring Boot embedded Tomcat and use only 1/5 of memory. 
Its features include: 
<ul>
<li>Plugin architecture for startup/shutdown hooks and middleware components</li>
<li>Distributed OAuth2 JWT security verification as part of the framework</li>
<li>Request and response validation against OpenAPI specification at runtime</li>
<li>Metrics collected in influxdb and viewed from Grafana Dashboard for both services and clients</li>
<li>Global exception handling for runtime exception, api exception and other checked exceptions</li>
<li>Mask sensitive data like credit card, sin number etc. before logging</li>
<li>Sanitize cross site scripting for query parameters, request headers and body</li>
<li>Audit to dump important info or entire request and response.</li>
<li>Body parser to support different content types</li>
<li>Standardized response code and messages from configuration file</li>
<li>Externalized configuration for all modules for dockerized environment</li>
<li>CORS pre-flight handler for SPA (Angular or React) from another domain</li>
<li>Rate limiting for services that exposed outside to the Internet</li>
<li>Service registry and discovery support direct, Consul and Zookeeper</li>
<li>Client side discovery and load balance to eliminate proxies</li>
<li>A client module that is tightly integrated with Light-OAuth2 and supports traceability</li>
</ul>

Light 4j is a fast, lightweight and cloud native microservices framework. Light means lightweight, lighting fast and shed light on how to program with modern Java SE. It is 44 times faster than the most popular microservices platform Spring Boot embedded Tomcat and use only 1/5 of memory.

light-4j - A fast, lightweight and more productive microservices framework

Ratpack is a set of Java libraries for building modern HTTP applications. It provides just enough for writing practical, high performance, apps. It is built on Java 8, Netty and reactive principles. It is similar to NodeJS, helps to implement non blocking HTTP apps in Java.


Ratpack - A toolkit for JVM web applications

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.
 
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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Quarkus - Supersonic Subatomic Java

Spark - A simple expressive web framework for java

light-4j - A fast, lightweight and more productive microservices framework

Ratpack - A toolkit for JVM web applications

Restlet - Restlet Framework for Java

RESTX - the lightweight Java REST framework

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Quarkus - Supersonic Subatomic Java

Spark - A simple expressive web framework for java

light-4j - A fast, lightweight and more productive microservices framework

Ratpack - A toolkit for JVM web applications

Restlet - Restlet Framework for Java

RESTX - the lightweight Java REST framework

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