Introducing Gradle by Balaji Varanasi

By Balaji Varanasi

This concise booklet is a brief start-up primer at the Gradle construct and free up software. you are going to know about Gradle and the way to set it as much as use. you are going to find out about the Gradle lifestyles cycle and the way to successfully leverage and use it. additionally, you are going to examine the fundamentals of utilizing web site plugins and producing Javadocs, try out coverage/FindBugs studies, version/release notes and extra. in addition, you are going to reap the benefits of Gradle's archetypes to bootstrap new initiatives easily.

After analyzing and utilizing Introducing Gradle, you should have an knowing of Gradle's dependency administration and the way to prepare uncomplicated and multi-module Gradle tasks. It contains the recent good points and improvements present in the most recent model of Gradle, an open resource superior Java construct and unlock instrument for Java that's specifically renowned between Spring program developers.

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The tasks under the Verification tasks group run unit tests. In addition to these tasks, the Java plugin provides some guidance on where different parts of Java project’s code should reside. Table 5-1 shows the recommended directories. Table 5-1. Gradle Recommended Directory Structure for Java Directory Assets to Put src/main/java Java source that needs to go to production src/main/resources Resources such as configuration files (XML) and property files that need to go to production src/test/java Java test source code src/test/resources Resources used during the testing phase ■■Note Experienced Maven users would notice that Java plugin’s directory conventions match Maven’s recommended Java project structure.

Now you are ready to build the code using the gradle build command. 479 secs Once the build is successful, open the hello-gradle folder in Windows Explorer and you will see a build folder created with the contents shown in Figure 5-1. The classes folder contains the compiled classes and the libs folder contains the assembled JAR file. The tmp folder contains temporary generated files, such as a manifest file. 44 Chapter 5 ■ Projects and Plugins Figure 5-1. Gradle build directory The output of the gradle build command shows the text "UP-TO-DATE" next to certain tasks.

Here is a very simple example without any arguments: def greet = {"Hello"} In the scenario when no arguments are declared, an untyped argument called it will be implicitly available to the closure body. Consider the following example, which makes use of the it argument: def greet = {"Hello $it"} When the greet closure is invoked with a parameter, such as "World", it would print Hello World. If the greet is invoked without a parameter, a null is passed. def greet = {"Hello $it"} greet "World" // Prints Hello World greet() // Prints Hello null Here are few more examples of closure definitions: { -> } { a, b -> a + b } {int a, int b -> a + b} // Empty Closure // Closure with two untyped arguments // Closure with two arguments of type int Closures can be passed as parameters to methods.

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