Java library suggestions for implementing a custom web server [closed]

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I would like to create a web server that will serve/accept json files through REST. The JSON files being served will come from a database query and format the results into JSON. Any suggestions for a good java library. I have tried using Apache HTTPComponents. While maybe I can just create a servlet but I am not really allowed to install a servlet container in the server machine.

EDIT: I was just thinking to create the program where I can just simply issue a simple java -jar Application.jar and everything is already started and functional. The application will listen on a certain port of the machine and respond to some requests from browser and/or another java program. Looks like Jetty will help me do it. As I have said, I have implemented something using HTTPComponents and I'm just simply parsing the URL from the requests and do something in the server based on the parsed URL.

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I'm a huge fan of the venerable Jetty. It's small and straightforward. It's technically a servlet container (it's more thought of an embedded HTTP server), but you can embed it within your own app. It also supports Java REST libraries such as Jersey

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CXF is a fantastic web services library. It has built-in support for REST, but I haven't tried that particular feature myself. CXF uses Jetty by default, but it's designed to be easily adaptable to Tomcat or other servlet containers.

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I would suggest having a look at:

• JBoss Netty
• Jetty

What I like about them:

• Both of you can be run embedded (as jar).
• They also both support an "asynchronous event-driven"/NIO architecture. Jetty has continuations for this. NIO is the new way of handling IO and has the ability to scale better.

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You might want to have a look at Restlet: Restlet Tutorial

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Check out Grizzly project

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Do you really need all the overhead and complexity of a web server? It sounds like all you really need is a socket listener.