Gradle: The Build system you have been waiting for

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 ?= -g
all: 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>${spring.version}</version>
</dependency>
<dependency>
<artifactId>spring-web</artifactId>
</dependency>
<dependency>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${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.properties
springVersion=3.2.8.RELEASE
junitVersion=4.11
 settings.gradle
rootProject.name = 'CounterWebApp'
 build.gradle
apply plugin: 'java'
apply plugin: 'war'
repositories {
mavenCentral()
}
group = 'com.mkyong'
archivesBaseName = 'CounterWebApp'
version = '1.0-SNAPSHOT'
sourceCompatibility = 1.6
dependencies {
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

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
 Discuss on JUG Facebook
 http://www.slideshare.net/CorneilduPlessis
 https://www.facebook.com/groups/jozijug

Gradle: The Build system you have been waiting for

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