To run examples from this book, you will need a computer running Windows, Linux, or macOS. You will also need IntelliJ IDEA (preferably IntelliJ Ultimate edition) or Eclipse. You will need a basic knowledge of GitHub and Git to clone project samples discussed in the book.

To run examples and programs covered in the book requires Kotlin 1.3 and Java 1.6 or higher. Most of the examples will also work with the earlier version of the Kotlin. The instructions to download necessary software and tools are provided in technical requirements of the each chapter.

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Kotlin-for-Enterprise-Applications-using-Java-EE. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "We will create a message Producer class."

A block of code is set as follows:

class Producer {
  @Inject
  private lateinit var initialContext: InitialContext
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

class Producer {
  @Inject
  private lateinit var initialContext: InitialContext
}

Any command-line input or output is written as follows:

> kotlinc -script 14c_SecondaryConstructor.kts

Bold: Indicates a new term, an important word, or words that you see on screen. For example: "The Java Messaging System (JMS) is the standard API for messaging systems."