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Here is a link to my Getting Started with Dropwizard course on Udemy. Only $10! In the previous installments of this series we discussed how to create a Dropwizard application using Maven archetype and how to use a YAML file to set configuration parameters for the application. In this tutorial we'll create a simple application that exposes an Employee Directory via REST API. For simplicity reasons our representations will not contain hyperlinks, that is we'll talk about Level 2 of Richardson Maturity Model . The sources for the tutorial can be found here . We'll begin with adding parameters of database connection including credentials, connection URI and database driver name to the application's configuration file. The snippet below shows how to configure the database connection. MySQL RDBMS was used for our example, but some other DBMS can be used. As we'll use Hibernate to talk to our database, switching databases is a snap, it...

Principles of REST architectural style were put forth by Dr. Roy Fielding in his thesis “Architectural Styles and the Design of Network-based Software Architectures”. One of the main principles of the style is that REST applications should be hypermedia driven , that is the change of an application's state or, in other words, transition from one resource to another, should be done by following the links. The rationale behind this principle is that all possible operations with the resource can be discovered without the need of any out-of-band documentation and if some URI changes, there is no need to change the client as it is server's responsibility to generate URIs and insert them into representations. This principle is also called Hypermedia As The Engine Of An Application state ( HATEOAS ). While the Thesis gives the prescription to use hyperlinks in the representations of resources, Hypertext Application Language (HAL) is one possible recipe for how to do desi...