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Spring Framework was created as a result of disappointment of Java community with earlier versions of Enterprise Java. Since then it has grown into huge ecosystem that allows one to solve every problem in building a Web-based Java application and more. Spring is often criticized because it used to rely on XML for configuration purposes. As a response to that the Spring Boot framework was released, which relies on convention over configuration principle and can do without XML at all. In this tutorial series we’ll go over how to create an application using Spring Framework and Spring Boot. While Spring Boot allows one to create an application faster, Spring is widely used today in enterprise environment and even by startups, so knowing Spring is definitely a marketable skill, and also learning it can provide one with the insight how Spring Boot works. The code for a simple Spring Framework application can be found here and the Spring Boot version here . Creating Spring W...

Here is a link to my Getting Started with Dropwizard course on Udemy. Only $10! Imagine a situation that you would like to create a currency conversion API using Dropwizard , but exchange rates are fickle and change on daily if not hourly basis. So, you need an external source of exchange rate data and luckily, Google search returns a list of such APIs. In this tutorial will connect to Open Exchange Rates which has a free option. To use the API one needs to obtain a free API key which is an alphanumeric string supplied as part of request string when accessing the API. Here is the description of how to obtain the key . From this moment it is supposed that you have obtained the key, otherwise you will be unable to follow the examples from this tutorial. Let’s play a little with the API before we start writing the actual code. First, one can obtain the list of supported currencies, this can be accomplished by navigating the following URL https://openexchangerates.org/a...

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...