Book Image

Developing Middleware in Java EE 8

Book Image

Developing Middleware in Java EE 8

Overview of this book

Middleware is the infrastructure in software based applications that enables businesses to solve problems, operate more efficiently, and make money. As the use of middleware extends beyond a single application, the importance of having it written by experts increases substantially. This book will help you become an expert in developing middleware for a variety of applications. The book starts off by exploring the latest Java EE 8 APIs with newer features and managing dependencies with CDI 2.0. You will learn to implement object-to-relational mapping using JPA 2.1 and validate data using bean validation. You will also work with different types of EJB to develop business logic, and with design RESTful APIs by utilizing different HTTP methods and activating JAX-RS features in enterprise applications. You will learn to secure your middleware with Java Security 1.0 and implement various authentication techniques, such as OAuth authentication. In the concluding chapters, you will use various test technologies, such as JUnit and Mockito, to test applications, and Docker to deploy your enterprise applications. By the end of the book, you will be proficient in developing robust, effective, and distributed middleware for your business.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Mapping collections


Collections can also be mapped from/to JSON arrays. In the following example, we will create a collection of multiple JSON objects, and then serialize it into a JSON array:

Movie movie1 = new Movie(); 
movie1.setId(15); 
movie1.setTitle("Beauty and The Beast"); 
 
Movie movie2 = new Movie(); 
movie2.setId(16); 
movie2.setTitle("The Boss Baby"); 
 
Movie movie3 = new Movie(); 
movie3.setId(17); 
movie3.setTitle("Suicide Squad"); 
 
// creating a list of the movie objects 
List<Movie> movies = new ArrayList<>(); 
movies.add(movie1); 
movies.add(movie2); 
movies.add(movie3); 
 
Jsonb jsonb = JsonbBuilder.create(); 
jsonb.toJson(jsonb); 
 
// convert to json 
String json = jsonb.toJson(movies); 
System.out.println(json); 

By running the previous example, we will have the following output:

[{"id":15,"title":"Beauty and The Beast"},{"id":16,"title":"The Boss Baby"},{"id":17,"title":"Suicide Squad"}]

In order to deserialize a JSON array back into a collection, we will...