Running Groovy scripts from Gradle using a different version of Groovy

Question

I am using Gradle 1.6 which comes with Groovy 1.8.6 and here comes the problem, I want to execute groovy script which need Groovy 2+, but Gradle is running this script with his own groovy (1.8.6) and my custom task is failing.

Foment

And what prevents you from backporting your script to work with groovy 1.8.x? – Vidovic

«Groovy 1.8.x cant parse large XML files» is completely false – Haden

Answer 1

You can create directory src/main/groovy, put your script called myscript.groovy in there:

println "hello world from groovy version ${GroovySystem.version}"

Then, have a build.gradle file in your project root directory:

apply plugin: 'groovy'

repositories {
    mavenCentral()
}

dependencies {
    compile 'org.codehaus.groovy:groovy-all:2.0.5'
}

task runScript (dependsOn: 'classes', type: JavaExec) {
    main = 'myscript'
    classpath = sourceSets.main.runtimeClasspath
}

Then, you can execute your script (with output)

hw@hbook:ex $ gradle runScript
:compileJava UP-TO-DATE
:compileGroovy
:processResources UP-TO-DATE
:classes
:runScript
hello world from groovy version 2.0.5

BUILD SUCCESSFUL

Total time: 6.118 secs

Alcoholometer

Answer 2

If you want to run scripts that uses @Grab you have to add ivy to compiler task

configurations {
    ivy
}

dependencies {
    ivy 'org.apache.ivy:ivy:2.4.0'
}

tasks.withType(GroovyCompile) {
    groovyClasspath += configurations.ivy
}

Raddled