Checking Groovy version Gradle is using

Question

I am running gradle and have previously been running groovy 1.76. I have now updated to groovy on my local machine (groovy_home points to groovy 2.1.2 etc).

$ groovy -version
Groovy Version: 2.1.2 JVM: 1.7.0_17 Vendor: Oracle Corporation OS: Linux

However, when I am running gradle commands (gradle test, classes, etc) I believe it is not building against groovy 2.1.2 but is actually still building against 1.76. (The reason I believe this, is that when I execute the classes I keep getting this error Upgrading Groovy 1.7 - 2.1 Incompatability, which is related to changes made post 1.76)

Is there a way to confirm which version of groovy my gradle install is building against?

Also, can anyone confirm where I should be configuring the groovy version for gradle?

Answer 1

While trying to check the groovy version during gradle runtime, I found you can also print the Groovy version:

task version { 
  doLast {
    println "Gradle version: " + project.getGradle().getGradleVersion()
    println "Groovy version: " + GroovySystem.getVersion()
  }
}

As examples:

$ ~/usr/gradle-1.8/bin/gradle -q version
Gradle version: 1.8
Groovy version: 1.8.6

$ ~/usr/gradle-2.1/bin/gradle -q version
Gradle version: 2.1
Groovy version: 2.3.6

Note.- GroovySystem.getVersion() is available since Groovy 1.6.9

Answer 2

Which Groovy library you are building against (and which Groovy compiler you are using) is determined by which Groovy library resides on the compile (or, in earlier Gradle versions, groovy) configuration. Typically a Groovy dependency is configured explicitly, but it may also be pulled in by transitive dependency management. (In case of a version conflict, the higher version wins by default. Which Groovy version(s) you have installed on your machine is irrelevant.) gradle dependencyInsight --configuration compile --dependency groovy should provide the answer.

Here is how a Groovy dependency is typically configured:

apply plugin: "groovy"

repositories {
    mavenCentral() // or some other repository containing a Groovy library
}

dependencies {
    // in Gradle 1.4 or earlier, replace 'compile' with 'groovy'
    compile "org.codehaus.groovy:groovy-all:2.1.2"
}