Book Image

Spring 5.0 Cookbook

By : Sherwin John C. Tragura
Book Image

Spring 5.0 Cookbook

By: Sherwin John C. Tragura

Overview of this book

The Spring framework has been the go-to framework for Java developers for quite some time. It enhances modularity, provides more readable code, and enables the developer to focus on developing the application while the underlying framework takes care of transaction APIs, remote APIs, JMX APIs, and JMS APIs. The upcoming version of the Spring Framework has a lot to offer, above and beyond the platform upgrade to Java 9, and this book will show you all you need to know to overcome common to advanced problems you might face. Each recipe will showcase some old and new issues and solutions, right from configuring Spring 5.0 container to testing its components. Most importantly, the book will highlight concurrent processes, asynchronous MVC and reactive programming using Reactor Core APIs. Aside from the core components, this book will also include integration of third-party technologies that are mostly needed in building enterprise applications. By the end of the book, the reader will not only be well versed with the essential concepts of Spring, but will also have mastered its latest features in a solution-oriented manner.
Table of Contents (20 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Implementing lambda expression using @FunctionInterface


Java 1.8 has formalized the lambda expression implementation through the use of the @FunctionalInterface annotation and the inclusion of the new specification on anonymous functions. This recipe will open a new technique in creating lambda expression.

Getting started

Using the same Eclipse project and EmployeeServiceImpl, add the needed service methods using @FunctionInterface components.

How to do it...

Many of the API classes in Java 1.8 use functional interfaces to simplify service implementation by applying the principles of functional programming. To illustrate what functional programming is, let us implement the following steps:

  1. Create another version of the EmployeeRecord interface of the previous recipe that uses the @FunctionalInterface annotation:
@FunctionalInterface 
public interface EmployeeRecordService { 
  public List<Employee> getEmployees(); 
} 
  1. Also in org.packt.function.codes.service, create a functional interface...