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New Application Modernization Tools for the Java Developer Visual COBOL® NEW APPLICATION MODERNIZATION TOOLS FOR THE JAVA DEVELOPER 00_COBOL2_AM.indb 1 4/19/21 5:08 PM Copyright © 2021 by Micro Focus. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted un-der Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, Inc. 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600. Requests to Micro Focus for permission should be addressed to the Legal Department, Micro Focus, 700 King Farm Blvd, Suite 125, Rockville, MD 20850, (301) 838-5000, fax (301) 838-5034. Micro Focus, Net Express, Server Express, Visual COBOL, COBOL Server, and Micro Focus Server are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. Other product and company names mentioned herein may be the trademarks of their respective owners. The example companies, organizations, products, domain names, e-mail addresses, logos, people, places, and events depicted herein are fictitious. No association with any real company, organization, product, domain name, e-mail address, logo, person, place, or event is intended or should be inferred. The book expresses the author’s views and opinions. The information contained in this book is provided with- out any express, statutory, or implied warranties. Neither the authors, Micro Focus, Box Twelve Press, nor their resellers or distributors will be held liable for any damages caused or alleged to be caused either directly or indirectly by this book. This document is provided “as-is”. Information and views expressed in this document, including URL and other Internet Web site references, may change without notice. Some examples depicted herein are provided for illustration only and are fictitious. No real association or connection is intended or should be inferred. ISBN: 978-0-578-79047-3 This book was set in Akzidenz-Grotesk by Box Twelve Press. 00_COBOL2_AM.indb 2 4/19/21 5:08 PM Contents at a Glance CHAPTER 1 Introduction 1 CHAPTER 2 Visual COBOL and Eclipse 5 CHAPTER 3 What is Visual COBOL for JVM? 19 CHAPTER 4 A Short Guide to Procedural COBOL 29 CHAPTER 5 An Example Application 41 CHAPTER 6 A COBOL-Based REST Service 67 CHAPTER 7 Automated Testing 99 CHAPTER 8 User Interface Modernization 127 CHAPTER 9 Containerizing COBOL Applications 155 CHAPTER 10 COBOL and Microservices 185 00_COBOL2_AM.indb 3 4/19/21 5:08 PM 00_COBOL2_AM.indb 4 4/19/21 5:08 PM Contents CHAPTER 1 Introduction 1 What Is Visual COBOL for JVM? ...................................................................................................................... 1 Why Have We Written This Book? .................................................................................................................. 2 Who Is This Book For? .............................................................................................................................................. 2 Prerequisites ...................................................................................................................................................................... 3 Downloading the Examples ................................................................................................................................... 4 Summary ............................................................................................................................................................................... 4 CHAPTER 2 Visual COBOL and Eclipse 5 Hello World ......................................................................................................................................................................... 5 Creating COBOL JVM Projects in Eclipse ................................................................................................ 7 Using Maven with Visual COBOL ..................................................................................................................10 Summary ............................................................................................................................................................................18 CHAPTER 3 What is Visual COBOL for JVM? 19 COBOL Dialects ..........................................................................................................................................................19 What is Managed Code? ......................................................................................................................................20 COBOL Source Formats ......................................................................................................................................21 The Visual COBOL Object Model .................................................................................................................23 Summary ............................................................................................................................................................................27 CHAPTER 4 A Short Guide to Procedural COBOL 29 COBOL Applications ................................................................................................................................................30 Structure of a COBOL program ......................................................................................................................31 Procedure Division .....................................................................................................................................................34 Copybooks .......................................................................................................................................................................38 Summary ............................................................................................................................................................................40 00_COBOL2_AM.indb 5 4/19/21 5:08 PM vi Contents CHAPTER 5 An Example Application 41 Introducing the Example.......................................................................................................................................41 Generating Example Data ...................................................................................................................................59 Calling COBOL from Java ...................................................................................................................................61 Summary ............................................................................................................................................................................66 CHAPTER 6 A COBOL-Based REST Service 67 The Application .............................................................................................................................................................67 The Interoperation Layer ......................................................................................................................................70 The MonthlyInterest Class ...................................................................................................................................85 Creating a REST Interface .................................................................................................................................88 Summary ............................................................................................................................................................................97 CHAPTER 7 Automated Testing 99 Strategies for Testing ..............................................................................................................................................99 Introducing MFUnit .................................................................................................................................................101 Testing the BusinessRules Layer ...............................................................................................................107 Testing the Interoperation Layer ..................................................................................................................117 Testing the Application End-to-End ..........................................................................................................120 Summary .......................................................................................................................................................................126 CHAPTER 8 User Interface Modernization 127 UI Choices ....................................................................................................................................................................127 The Credit Service UI Application ..............................................................................................................130 Getting Started with React ..............................................................................................................................135 Summary .........................................................................................................................................................................154 00_COBOL2_AM.indb 6 4/19/21 5:08 PM Contents
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