Gradle: The Build System

Corneil du Plessis

corneil.duplessis@gmail.com@corneil

Gradle: Introduction

The Build System you have been waiting for.

Gradle: Introduction

Scope

History Lesson

− Make

− Ant

− Maven Gradle

Gradle: Make

Targets, dependencies, rules

Sample:CFLAGS ?= -gall: helloworld

helloworld: helloworld.o # Commands start with TAB not spaces $(CC) $(LDFLAGS) -o $@ $^

helloworld.o: helloworld.c $(CC) $(CFLAGS) -c -o $@ $<

Suffix rules:.c.o: $(CC) $(CFLAGS) -c $<

Gradle: Ant

Projects, targets, dependency, built-in tasks, taskdef. <project name="My Project" default="all" basedir=".">

<property name="app.name" value="hello"/> <property name="tcserver.home" value="/opt/tomcat-6.0.25.A.RELEASE" /> <property name="work.home" value="${basedir}/work"/> <property name="dist.home" value="${basedir}/dist"/> <property name="src.home" value="${basedir}/src"/> <property name="web.home" value="${basedir}/web"/> <path id="compile.classpath"> <fileset dir="${tcserver.home}/bin"> <include name="*.jar"/> </fileset> <pathelement location="${tcserver.home}/lib"/> <fileset dir="${tcserver.home}/lib"> <include name="*.jar"/> </fileset> </path>

Gradle: Ant – cont.

<target name="all" depends="clean,compile,dist" description="Clean work dirs, then compile and create a WAR"/> <target name="clean" description="Delete old work and dist directories"> <delete dir="${work.home}"/> <delete dir="${dist.home}"/> </target> <target name="prepare" depends="clean" description="Create work dirs copy static files to work dir"> <mkdir dir="${dist.home}"/> <mkdir dir="${work.home}/WEB-INF/classes"/> <copy todir="${work.home}"> <fileset dir="${web.home}"/> </copy> </target> <target name="compile" depends="prepare" description="Compile sources and copy to WEB-INF/classes dir"> <javac srcdir="${src.home}" destdir="${work.home}/WEB-INF/classes"> <classpath refid="compile.classpath"/> </javac> <copy todir="${work.home}/WEB-INF/classes"> <fileset dir="${src.home}" excludes="**/*.java"/> </copy> </target> <target name="dist" depends="compile" description="Create WAR file for binary distribution"> <jar jarfile="${dist.home}/${app.name}.war" basedir="${work.home}"/> </target>

</project>

Gradle: Maven

POM, Goals, Lifecycle, Plugins, Profiles

Maven Repository <project

xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.mkyong</groupId> <artifactId>CounterWebApp</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>CounterWebApp Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <spring.version>3.2.8.RELEASE</spring.version> <junit.version>4.11</junit.version> <jdk.version>1.6</jdk.version> </properties>

Gradle: Maven – cont

<dependencies> <!-- Spring 3 dependencies → <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency></dependencies>

Gradle: Maven – cont

<build> <finalName>CounterWebApp</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.0</version> <configuration> <source>${jdk.version}</source> <target>${jdk.version}</target> </configuration> </plugin> </plugins></build></project>

Gradle: What is it?

Gradle is a Groovy DSL for creating build scripts

Gradle has a beautiful designed model for Tasks, Dependencies, Conventions etc.

Gradle understands Ivy and Maven repositories

Gradle can execute Ant scripts and tasks directly

Gradle: What does it look like?

gradle.propertiesspringVersion=3.2.8.RELEASEjunitVersion=4.11

settings.gradlerootProject.name = 'CounterWebApp'

build.gradleapply plugin: 'java'apply plugin: 'war'repositories { mavenCentral()}group = 'com.mkyong'archivesBaseName = 'CounterWebApp'version = '1.0-SNAPSHOT'sourceCompatibility = 1.6dependencies { compile 'org.springframework:spring-core:${springVersion}' compile 'org.springframework:spring-web:${springVersion}' compile 'org.springframework:spring-webmvc:${springVersion}' testCompile group: 'junit', name: 'junit', version: junitVersion}

Gradle: Artifacts

build.gradle

− buildScript

− configurations

− dependencies

− apply plugin

− artifacts

− sourceSets

− other dsl sections and Groovy settings.gradle

− subprojects gradle.properties

− Global properties

Gradle: Builtin Support

Ant Projects, Tasks

Java, Jar, War, Ear

Scala, Groovy

Sonar, Pmd, Jacoco, CheckStyle, FindBugs, CodeNarc, JDepend

Maven Publish, Ivy Publish

Jetty

GNU Compilers, Clang, Visual C++

Eclipse, IdeaJ, Netbeans

Gradle: Create scripts

Create build.gradle and other files

− Basic, Java Library, Scala Library, Groovy Library

− Convert pom gradle init –type <project-type>

Checkout lazybones at https://github.com/pledbrook/lazybones

Gradle: Demo

Conversion from pom

Custom Tasks

Gradle: 3rd Party plugins

http://plugins.gradle.org

Google Android Development

Bintray publishing.

Artifactory

Spring IO Framework

https://github.com/nebula-plugins

Google App Engine

Tomcat

lessCss, minCss, minJs

Gradle – Questions

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