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Java EE 8 and Angular
Java EE 8 and Angular

Java EE 8 and Angular: A practical guide to building modern single-page applications with Angular and Java EE

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Profile Icon Prashant Padmanabhan
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Full star icon Full star icon Full star icon Half star icon Empty star icon 3.2 (6 Ratings)
Paperback Jan 2018 348 pages 1st Edition
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Arrow left icon
Profile Icon Prashant Padmanabhan
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$19.99 per month
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.2 (6 Ratings)
Paperback Jan 2018 348 pages 1st Edition
eBook
$27.98 $39.99
Paperback
$48.99
Subscription
Free Trial
Renews at $19.99p/m
eBook
$27.98 $39.99
Paperback
$48.99
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Free Trial
Renews at $19.99p/m

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Java EE 8 and Angular

The CDI Advantage Combined with JPA

In this chapter, we will go over CDI, which has become a ubiquitous API for dependency injection and context management in Java EE. We will be looking at the new CDI 2.0 features along with the earlier ones, which are shipped with Java EE 8. Having completed the CDI journey, we will move onto the standard persistence solution, Java Persistence API (JPA) for Java applications.

The topics covered will be:

  • The CDI programming model:
    • CDI for Java SE 8
    • RequestContext activation
    • Event enhancements:
      • Asynchronous events
      • Ordered events
    • Annotation Literals
  • JPA:
    • Entities
    • Performing CRUD operations with entities
    • Entity listeners
    • Validations in entities

Introduction to context and dependency injection

CDI caters to a very fundamental design idea, as that of dependency injection. When writing any application, you would typically define multiple classes and some relationship between them. Thus, to work with one object you would need to hand it its dependencies during its creation. When using CDI, these dependencies are provided to the object, rather than the owning object fetching them for itself. Dependency Injection (DI) leads to the owning object becoming independent of the dependency creation and lookup code, which makes it loosely coupled, and the code is testable. Both qualities, while difficult to pull off, are worth striving for.

Now, before we get into the nuts and bolts of CDI and how it helps to structure the code, let's explore what dependency injection is and what problems it helps solve with an example. Consider...

CDI programming model

This programming model unifies the various approaches taken by existing dependency injection frameworks such as Spring, Guice, and Seam. It has been designed considering the scope of objects as well. CDI was introduced in Java EE 6, and now with Java EE 8, we have the latest CDI 2.0 version, which offers Java SE support as well. While Java EE 5 did make resource injection possible, it did not have the support for general purpose dependency injection for objects. With CDI, we have beans that are container managed, and these managed beans are Plain Old Java Objects (POJOs) whose life cycle is controlled by the Java EE container. The idea of the bean has been presented in Java for ages in various forms, such as JSF bean, EJB bean, and so on. CDI takes this idea and provides a unified view to managed beans across the entire Java platform, which is relied on by...

Java Persistence API (JPA)

Before we start wielding JPA and CDI together, let’s get the basics out of the way for JPA. The Java Persistence API allows for the modelling of the domain objects for accessing, persisting, and managing data between POJOs and a relational database. JPA is the standard for working with object-relational mapping (ORM) solutions. Popular ORM solutions include Hibernate, EclipseLink (the reference implementation for all JPA versions), Apache OpenJPA, and DataNucleus. JPA puts the focus back on the domain model for retrieving and persisting data without having to deal with resource management and vendor specific SQL.

Most developers would be accustomed to hearing about Hibernate in articles and projects; it also shows up as a skill sought by employers. While Hibernate and the like can be used directly, using JPA helps us avoid falling in the vendor...

Summary

As you may have noticed, getting started with JPA and CDI isn't that complex. With an understanding of both, it's possible to build large applications which utilize these technologies for various business cases. We looked at how dependency injection promotes writing loosely coupled and testable code and how CDI, a ubiquitous API for dependency injection and context management in Java EE, helps us do that.

CDI 2 brings ordered and asynchronous events to further enrich this programming model. As of the 2.0 release, CDI is available for Java SE as well. JPA has been updated for utilizing Java 8 Streams, repeatable annotations, and date/time APIs along with better CDI integration support. The JPA entities are defined as classes using @Entity, @MappedSuperclass, and @Embeddable annotations. To track state changes, we get to use entity listeners that can be used with...

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Key benefits

  • Leverage Java EE 8 features to build robust backend for your enterprise applications
  • Use Angular to build a single page frontend and combine it with the Java EE backend
  • A practical guide filled with ample real-world examples

Description

The demand for modern and high performing web enterprise applications is growing rapidly. No more is a basic HTML frontend enough to meet customer demands. This book will be your one-stop guide to build outstanding enterprise web applications with Java EE and Angular. It will teach you how to harness the power of Java EE to build sturdy backends while applying Angular on the frontend. Your journey to building modern web enterprise applications starts here! The book starts with a brief introduction to the fundamentals of Java EE and all the new APIs offered in the latest release. Armed with the knowledge of Java EE 8, you will go over what it's like to build an end-to-end application, configure database connection for JPA, and build scalable microservices using RESTful APIs running in Docker containers. Taking advantage of the Payara Micro capabilities, you will build an Issue Management System, which will have various features exposed as services using the Java EE backend. With a detailed coverage of Angular fundamentals, the book will expand the Issue Management System by building a modern single page application frontend. Moving forward, you will learn to fit both the pieces together, that is, the frontend Angular application with the backend Java EE microservices. As each unit in a microservice promotes high cohesion, you will learn different ways in which independent units can be tested efficiently. Finishing off with concepts on securing your enterprise applications, this book is a handson guide for building modern web applications.

Who is this book for?

This book is for Java EE developers who would like to build modern enterprise web applications using Angular. No knowledge of Angular is required.

What you will learn

  • Write CDI-based code in Java EE 8 applications
  • Build an understanding of microservices and what they mean in a Java EE context
  • Employ Docker to build and run microservice applications
  • Use configuration optionsto work effectively with JSON documents
  • Handle asynchronous task and write RESTAPI clients
  • Set the foundation for working on Angular projects with the fundamentals of TypeScript
  • Learn to use Angular CLI to add and manage new features
  • Secure Angular applicationsusing malicious attacks adopting JSON Web tokens

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jan 11, 2018
Length: 348 pages
Edition : 1st
Language : English
ISBN-13 : 9781788291200
Vendor :
Oracle
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Product Details

Publication date : Jan 11, 2018
Length: 348 pages
Edition : 1st
Language : English
ISBN-13 : 9781788291200
Vendor :
Oracle
Languages :
Tools :

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Table of Contents

15 Chapters
What's in Java EE 8? Chevron down icon Chevron up icon
The CDI Advantage Combined with JPA Chevron down icon Chevron up icon
Understanding Microservices Chevron down icon Chevron up icon
Building and Deploying Microservices Chevron down icon Chevron up icon
Java EE Becomes JSON Friendly Chevron down icon Chevron up icon
Power Your APIs with JAXRS and CDI Chevron down icon Chevron up icon
Putting It All Together with Payara Chevron down icon Chevron up icon
Basic TypeScript Chevron down icon Chevron up icon
Angular in a Nutshell Chevron down icon Chevron up icon
Angular Forms Chevron down icon Chevron up icon
Building a Real-World Application Chevron down icon Chevron up icon
Connecting Angular to Java EE Microservices Chevron down icon Chevron up icon
Testing Java EE Services Chevron down icon Chevron up icon
Securing the Application Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.2
(6 Ratings)
5 star 50%
4 star 0%
3 star 0%
2 star 16.7%
1 star 33.3%
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Hayk Manasyan Oct 07, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The book is very good and very productive. There you can find and theory and code examples. With finishing the book you'll have a working application. It's too easy to read.The book is not for beginners.Thanks a lot.
Amazon Verified review Amazon
Clement Levallois Jun 02, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The book teaches how to create an application where the front end is developed in angular, and the back is JavaEE running on a microserver profile with Docker, the two connecting with the latest version of JavaEE api and JSON specs, which have evolved quite a lot since Java EE 7 -as I learned in the book.All the above covered in details in just one book, that's impressive! As a Java developer I was surprised by the extensive coverage of JavaEE 8 (half of the book), which is really needed in fact. In comparison I found the treatment of Angular a bit too quick - maybe because this is where I am a true beginner. If you are in this case, this book is the best starting point, but you should probably buy next an advanced book on Typescript and Angular to go further.Of course the book comes with a complete demo app on GitHub so very easy to follow step by step.
Amazon Verified review Amazon
Sheldon Mar 12, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
An excellent technical book for full stack application development that teaches you how to build a complete web application, covering all the Architectural layers in-between with easy to understand code examples.The book covers everything you need to know, Java EE, JSON, REST, Micro-services and Angular and also focuses on other important aspects like Security. If your new to Angular & Java or looking to refresh your knowledge this is a great book to learn and quickly build your application in Java EE & Angular.I highly recommend this book!!!
Amazon Verified review Amazon
Akshay Apr 04, 2018
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Just overview of things, not at all worth the price.
Amazon Verified review Amazon
Matthew G. Fleming Dec 31, 2018
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
At the time that I bought this book, it had a five star rating, though from only two reviewers. Maybe these reviewers were friends or relatives of the author, or maybe they belonged to its target audience and I do not. But I struggle to grasp what its target audience might be, or who might benefit from reading it. As far as I can tell, this book will not get anyone up to speed using Angular and Java EE for their next web development project, even if they already have a background in Java EE.
Amazon Verified review Amazon
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