Book Image

Kotlin for Enterprise Applications using Java EE

By : Raghavendra Rao K

Book Image

Kotlin for Enterprise Applications using Java EE

By: Raghavendra Rao K

Overview of this book

Kotlin was developed with a view to solving programmers’ difficulties and operational challenges. This book guides you in making Kotlin and Java EE work in unison to build enterprise-grade applications. Together, they can be used to create services of any size with just a few lines of code and let you focus on the business logic. Kotlin for Enterprise Applications using Java EE begins with a brief tour of Kotlin and helps you understand what makes it a popular and reasonable choice of programming language for application development, followed by its incorporation in the Java EE platform. We will then learn how to build applications using the Java Persistence API (JPA) and Enterprise JavaBeans (EJB), as well as develop RESTful web services and MicroServices. As we work our way through the chapters, we’ll use various performance improvement and monitoring tools for your application and see how they optimize real-world applications. At each step along the way, we will see how easy it is to develop enterprise applications in Kotlin. By the end of this book, we will have learned design patterns and how to implement them using Kotlin.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

Kotlin – A First look

Kotlin – A First look

Technical requirements

Introduction to Kotlin

A quick tour of Kotlin

Lambda expressions in Kotlin

Extension functions

Classes in Kotlin

Kotlin programming style and Syntax

Kotlin – The Game Changer

Kotlin – The Game Changer

Technical requirements

Why Kotlin is the game changer

Kotlin versus Java

Configuring Kotlin in the project

Working with coroutines

Using Kotlin with Java

An Overview of Java EE and Kotlin

An Overview of Java EE and Kotlin

Technical requirements

Overview of Java EE

Kotlin with JSF and CDI

Kotlin with JSF and CDI

Technical requirements

Introduction to JSF

JSF architecture

Developing our first JSF application

Kotlin with JPA and EJB

Kotlin with JPA and EJB

Technical requirements

Kotlin Data Classes

Java Persistence API

Modeling JPA entities

Exception handling

Using JPA in an application

Enterprise Messaging with Kotlin

Enterprise Messaging with Kotlin

Technical requirements

Understanding the messaging domains

Messaging queues and topics

Building a messaging service using Kotlin

Message acknowledgement

Developing RESTful Services with JAX-RS

Developing RESTful Services with JAX-RS

Technical requirements

Understanding REST verbs

Introduction to JAX-RS

Implementing a RESTful service using Jersey

Implementing Real-World RESTful Web Services

Securing JAVA EE Applications with Kotlin

Securing JAVA EE Applications with Kotlin

Technical requirements

Introduction to security API

The IdentityStore mechanism

HttpAuthenticationMechanism

Implementing security API using Kotlin

Securing JAX-RS APIs with JWT

Implementing Microservices with Kotlin

Implementing Microservices with Kotlin

Technical requirements

Introduction to microservices

Breaking the monolith into microservices

Developing real-world microservices

Writing test code for microservices

Performance Monitoring and Logging

Performance Monitoring and Logging

Technical requirements

Finding Memory Leaks

Application monitoring

Garbage collection

Getting our real-world application production-ready

Design Patterns with Kotlin

Design Patterns with Kotlin

Technical requirements

Design patterns

Categorizing design patterns

Implementing the singleton pattern

Implementing the factory pattern

Implementing the builder pattern

Implementing the decorator pattern

Implementing the observer pattern

Implementing the chain of responsibility pattern

Selecting design patterns

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Introduction to JAX-RS

JAX-RS stands for Java API extension for RESTful Web services. JAX-RS is a specification that defines a set of APIs for developing web services in REST architecture style. This has become very popular in the past few years and is commonly used to build microservices. As previously discussed, RESTful services are interoperable services that interact with each other over the network, and JAX-RS helps us to build these services.

JAX-RS is Java's implementation for the REST style of architecture. This is a collection of Java annotations and interfaces that aid in developing RESTful web services. Here, there are both client- and server-side APIs, which are designed to do REST-based development in Java EE. JAX-RS specification was standardized in Java EE 6, the JAX-RS version was updated to JAX-RS 2.0 in Java EE 7, and this was improved in Java EE 8.

JAX...