Dropwizard Java REST services

To sum it up; Dropwizard rocks.

I’ve done quite a bit of WS development both the on client side and server side; interacting with both SOAP, REST and variants of XML/JSON RPC hybrid services. For my latest project I need to expose a set of REST services to a myriad of clients: phones, fat JS clients etc. This application also needs to talk to other nodes or “agents” that are also doing work in a distributed cloud environment. The core engine of this application really has no need for a bloated higher level MVC/gui supporting stack and bringing that into this library would just be a pain. I’ve always like the simplicity of being able to skip the whole JEE/Spring/Tomcat based container stack and just do a plain old “java -jar”… run my application…. but the reality of being able to do that has been lacking… until now.

In looking at the available options for picking the framework to use (such as Restlet, Spring-MVC REST, Spring Data REST etc and others), I immediately became discouraged when looking at examples for setting them up; they are full of complexity and lots of configuration and generally require a full application server container to run within, which just adds further complexity to your setup.

Then I stumbled across Dropwizard by the folks at Yammer. I encourage everyone reading this to just try the simple Hello World example they have on their site. If you have any experience in this space and an appreciation and vision for decoupling; you will immediately recognize the beauty of this little framework and the power it can bring to the table from a deployment standpoint. Build your core app engine back-end library as you normally would, toss in Dropwizard, expose some REST services to extend your interfaces to the outside world; throw it up on a server and “java -jar myapp server myconfig.yml” and you are ready to rock. (they make this possible by in-lining Jetty). Create a few little JS/HTML files for a fat JS client, (i’d recommend Angular) and hook into your REST services and you will have an awesome little decoupled application.

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