Book Image

Spring MVC Cookbook

By : Alexandre Bretet, Alex Bretet
Book Image

Spring MVC Cookbook

By: Alexandre Bretet, Alex Bretet

Overview of this book

Spring MVC is a lightweight application framework that comes with a great configuration by default. Being part of the Spring Framework, it naturally extended and supported it with an amazing set of recognizable annotations. External libraries can be plugged in and plugged out. It also possesses a request flow. Complete support of REST web services makes the Spring architecture an extremely consistent choice to support your front-end needs and Internet transformations. From the design of your Maven modules, you will achieve an Enterprise-standard for a stateless REST application based on Spring and Spring MVC with this book. This guide is unique in its style as it features a massive overview of practical development techniques brought together from the Spring ecosystem, the new JEE standards, the JavaScript revolution and Internet of Things. You will begin with the very first steps of Spring MVC's product design. Focused on deployment, viability, and maintainability, you will learn the use of Eclipse, Maven, and Git. You will walk through the separation of concerns driven by the microservices principles. Using Bootstrap and AngularJS, you will develop a responsive front-end, capable of interacting autonomously with a REST API. Later in the book, you will setup the Java Persistence API (JPA) within Spring; learn how to configure your Entities to reflect your domain needs, and discover Spring Data repositories. You will analyze how Spring MVC responds to complex HTTP requests. You will implement Hypermedia and HATEOAS to guide your customer's stateless conversation with the product and see how a messaging-service based on WebSocket can be configured. Finally you will learn how to set up and organize different levels of automated-tests, including logging and monitoring.
Table of Contents (16 chapters)
Spring MVC Cookbook
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Choosing a strategy to expose JPA Entities


The content object(s) exposed in resources are JPA Entities. The interesting point about wrapping a JPA Entity in a resource comes with the low-level nature of an Entity itself, which supposedly represents a restricted identifiable domain area. This definition should ideally be entirely translated to the exposed REST resources.

So, how do we represent an Entity in REST HATEOAS? How do we safely and uniformly represent the JPA associations?

This recipe presents a simple and conservative method to answer these questions.

How to do it…

  1. We have presented one entity used as a resource (Index.java). Here is another entity that is used: Exchange.java. This entity presents a similar strategy to expose its JPA associations:

    import edu.zc.csm.core.converters.IdentifiableSerializer;
    import edu.zc.csm.core.converters.IdentifiableToIdConverter;
    
    @Entity
    public class Exchange extends ProvidedId<String> {
      private String name;
    
      @ManyToOne(fetch = FetchType...