Book Image

Gradle Effective Implementations Guide - Second Edition

By : Hubert Klein Ikkink
Book Image

Gradle Effective Implementations Guide - Second Edition

By: Hubert Klein Ikkink

Overview of this book

Gradle is a project automation tool that has a wide range of applications. The basic aim of Gradle is to automate a wide variety of tasks performed by software developers, including compiling computer source code to binary code, packaging binary codes, running tests, deploying applications to production systems, and creating documentation. The book will start with the fundamentals of Gradle and introduce you to the tools that will be used in further chapters. You will learn to create and work with Gradle scripts and then see how to use Gradle to build your Java Projects. While building Java application, you will find out about other important topics such as dependency management, publishing artifacts, and integrating the application with other JVM languages such as Scala and Groovy. By the end of this book, you will be able to use Gradle in your daily development. Writing tasks, applying plugins, and creating build logic will be your second nature.
Table of Contents (18 chapters)
Gradle Effective Implementations Guide - Second Edition
About the Author
About the Reviewer

Avoiding common pitfalls

A common mistake when creating a task and adding actions for this task is that we forget the left-shift operator (<<). Then we are left with a valid syntax in our build script, so we don't get an error when we execute the task. However, instead of adding actions, we have configured our task. The closure we use is then interpreted as a configuration closure. All methods and properties in the closure are applied to the task. We can add actions for our tasks in the configuration closure, but we must use the doFirst and doLast methods. We cannot use the left-shift operator (<<).

The following tasks do the same thing, but note the subtle differences when we define the tasks:

def printTaskName = { task -> 
    println "Running ${}" 
task 'one' { 
    // Invoke doFirst method to add action. 
    doFirst printTaskName 
// Assign action through left-shift operator (<<). 
task 'two' << printTaskName 
task 'three' { 
    // This...