Book Image

Spring 5.0 By Example

By : Claudio Eduardo de Oliveira
Book Image

Spring 5.0 By Example

By: Claudio Eduardo de Oliveira

Overview of this book

With growing demands, organizations are looking for systems that are robust and scalable. Therefore, the Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The book has three parts, where each one covers the building of a comprehensive project in Java and Spring. In the first part, you will construct a CMS Portal using Spring's support for building REST APIs. You will also learn to integrate these APIs with AngularJS and later develop this application in a reactive fashion using Project Reactor, Spring WebFlux, and Spring Data. In the second part, you’ll understand how to build a messaging application, which will consume the Twitter API and perform filtering and transformations. Here, you will also learn about server-sent events and explore Spring’s support for Kotlin, which makes application development quick and efficient. In the last part, you will build a real microservice application using the most important techniques and patterns such as service discovery, circuit breakers, security, data streams, monitoring, and a lot more from this architectural style. By the end of the book, you will be confident about using Spring to build your applications.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Enabling Twitter in our application


In this section, we will enable the use of Twitter APIs on our Twitter Gathering application. This application should get Tweets based on the query specified by the user. This query was registered on the previous microservice that we created in the previous chapter.

When the user calls the API to register TrackedHashTag, the microservice will store the TrackedHashTag on the Redis database and send the message through the RabbitMQ. Then, this project will start to gather Tweets based on that. This is the data flow. In the next chapter, we will do a reactive stream and dispatch Tweets through our Reactive API. It will be amazing.

However, for now, we need to configure the Twitter credentials; we will do that using Spring beans – let's implement it.

Producing Twitter credentials

We will use the @Configuration class to provide our Twitter configuration objects. The @Configuration class is really good to provide infrastructure beans, if we do not have starter projects...