Book Image

Learning Pentaho Data Integration 8 CE - Third Edition

Book Image

Learning Pentaho Data Integration 8 CE - Third Edition

Overview of this book

Pentaho Data Integration(PDI) is an intuitive and graphical environment packed with drag-and-drop design and powerful Extract-Tranform-Load (ETL) capabilities. This book shows and explains the new interactive features of Spoon, the revamped look and feel, and the newest features of the tool including transformations and jobs Executors and the invaluable Metadata Injection capability. We begin with the installation of PDI software and then move on to cover all the key PDI concepts. Each of the chapter introduces new features, enabling you to gradually get practicing with the tool. First, you will learn to do all kind of data manipulation and work with simple plain files. Then, the book teaches you how you can work with relational databases inside PDI. Moreover, you will be given a primer on data warehouse concepts and you will learn how to load data in a data warehouse. During the course of this book, you will be familiarized with its intuitive, graphical and drag-and-drop design environment. By the end of this book, you will learn everything you need to know in order to meet your data manipulation requirements. Besides, your will be given best practices and advises for designing and deploying your projects.
Table of Contents (17 chapters)

Doing simple tasks with the Java Class step


Just as the JavaScript step, the User Defined Java Class step is also meant to insert code into your transformations but in this case, it's Java code. Whether you need to implement a functionality not provided in built-in steps or want to reuse some external Java code, or to access Java libraries, or to increase performance, this step is what you need. In this section, you will learn how to use it.

Using the Java language in PDI

Java—originally developed at Sun Microsystems, which then merged into Oracle Corporation—is one of the most popular programming languages in use, particularly for client-server web applications. In particular, PDI and the whole Pentaho platform have been developed using Java as the core language.

It was to be expected that eventually, a step would appear that allows you to code Java inside PDI. This step is User Defined Java Class, which we will call UDJC or Java Class step for short. The goal of this step is to allow you...