Gradle: Harder, Stronger, Better, Faster

1. ANDRES ALMIRAY IX-CHEL RUIZ
@AALMIRAY @IXCHELRUIZ
HARDER, BETTER,
STRONGER, FASTER

4. WHAT

5. Gradle is a build tool designed to take
advantage of conventions over (not instead)
configuration, while staying flexible enough to
be customized to the needs of a particular
project.
In other words, the build tool bends to the
project’s will, not the other way around.

6. Follows the Maven conventions.
Expressive : Prefers a DSL for describing what
needs to be done.
Extensible : Has a growing an thriving plugin
ecosystem.
Productive : Fosters fast and reproducible builds.
Convenient : It’s CI friendly (gradle wrapper).

7. WHY

8. RebelLabs © ZeroTurnaround

9. RebelLabs © ZeroTurnaround

11. Caching of task input and outputs
Richer, configurable lifecycle
The Gradle deamon
The Gradle wrapper
Multi-project builds are hassle free
Plugin development is more intuitive
Better documentation overall

12. HOW

13. $ curl -s get.gvmtool.net | bash
$ gvm install gradle

14. .
├── build.gradle
├── pom.xml
└── src
├── main
│ └── java
│ └── sample
│ └── Foo.java
└── test
└── java
└── sample
└── FooTest.java

15. <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.acme</groupId>
<artifactId>sample</artifactId>
<packaging>jar</packaging>
<version>0.0.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
😐

16. apply plugin: 'java'
apply plugin: 'maven-publish'
version = '0.0.0-SNAPSHOT'
group = 'com.acme'
repositories {
jcenter()
}
dependencies {
testCompile 'junit:junit:4.12'
}
😎

17. SCENARIOS

18. ü Executable/Launchable
application
ü Executable fat jar
ü Installable application

19. EXECUTABLE
LAUNCHABLE
APPLICATION

20. <project ...>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
<mainClass>sample.Foo</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>
$ mvn compile exec:java
😐

21. apply plugin: 'java'
apply plugin: 'application'
mainClassName = 'sample.Foo'
$ gradle run
😎

22. EXECUTABLE
FAT JAR

23. <plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.3</version>
<configuration>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<manifestEntries>
<Main-Class>sample.Foo</Main-Class>
</manifestEntries>
</transformer>
</transformers>
</configuration>
</plugin>
<plugins>
$ mvn package –DskipTests=true
😐

24. plugins {
id 'com.github.johnrengelman.shadow' version '1.2.1'
}
apply plugin: 'java'
apply plugin: 'application'
mainClassName = 'sample.Foo'
repositories { jcenter() }
dependencies { compile 'commons-lang:commons-lang:2.6' }
$ gradle shadowJar
😎

25. Installable application
.
├── bin
│ ├── sample
│ └── sample.bat
└── lib
├── commons-lang-2.6.jar
└── sample-0.0.0-SNAPSHOT.jar

26. 1. Add assembly plugin
2. Create assembly descriptor
1. Dist option for building the directory structure
2. Zip option for packing all in a single file
3. Create launch scripts (for all target platforms!)
4. Might require custom profiles
OR configure the appassembler plugin
😐

27. apply plugin: 'java'
apply plugin: 'application’
mainClassName = 'sample.Foo'
repositories {
jcenter()
}
dependencies {
compile 'commons-lang:commons-lang:2.6'
}
$ gradle distZip
😎

28. BUT WAIT,
THERE’S
MORE

29. $ gvm install lazybones
$ lazybones create gradle-quickstart
sample

31. license
versions
stats
bintray
shadow
izpack
java2html
git
coveralls
asciidoctor
jbake
markdown
livereload
gretty
Nexus
watch
wuff
spawn

32. THANK YOU!
HTTP://PEOPLE.CANOO.COM/SHARE
ANDRES ALMIRAY IX-CHEL RUIZ
@AALMIRAY @IXCHELRUIZ