How to return 'configurations.runtime.artifacts.files' from a method?

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1

Context: I have a task that works fine:

task copyArtifactJars(type: Copy) {
    from(configurations.runtime.artifacts.files)
    into signdir
  }

But, I want to have the files list come from a method so I can process the list before returning it.

If I simply change the above task to be:

task copyArtifactJars(type: Copy) {
    from(getRuntimeArtifacts())
    into signdir
  }
  def getRuntimeArtifacts() { configurations.runtime.artifacts.files }

then it no longer works, complaining: groovy.lang.MissingPropertyException: Could not find property ‘runtime’ on configuration container.

Is this because the configurations.runtime expression is getting evaluated during the Configuration phase, and that expression isn’t valid yet?

So I tried delaying evaluation by wrapping the returned expression in a closure, but then I got the exception: org.gradle.api.GradleException: Could not determine the dependencies of task ‘:foo:copyArtifactJars’.

How can I calculate a processed list of artifacts for my Copy Task?

Thanks, Neil

2

Update:

Actually, after wrapping the returned expression in a closure (trying to delay evaluation), I got the exception:

org.gradle.api.GradleException: Could not determine the dependencies of task ‘:foo:copyArtifactJars’. but it has a cause of: Caused by: groovy.lang.MissingPropertyException: Could not find property ‘runtime’ on configuration container.

If I declare the @InputFiles another way will that stop the closure from getting evaluated early?

3

The configuration ‘runtime’ is introduced by the Java plugin. You will need to apply that plugin or define your own configuration.

4

The groovy plugin is applied - that supplies ‘runtime’, right?

I’m trying to understand:

  • why using configurations.runtime works when supplied to the from, but doesn’t work when returned from a method

  • how to fix it (and I describe some attempts to fix it above)

P.S. Your book is very good, btw. Thank you.

5

That’s right. The Groovy plugin applies the Java plugin.

For me your code works. This is what I have:

apply plugin: 'groovy'
  ext.signdir = 'signing'
  task copyArtifactJars(type: Copy) {
    from(getRuntimeArtifacts())
    into signdir
}
    def getRuntimeArtifacts() {
     configurations.runtime.artifacts.files
 }
6

Hmm… interesting.

My real project has several subprojects in a single build.gradle file.

The copyArtifactJars task is in one of the subprojects, but I can’t put the method in the subproject with it (because of the nesting in the build.gradle file).

Is that why it doesn’t work for me - subprojects in a single build file?

7

My guess is that you are not applying the Groovy plugin to that specific project. I’d need to see the full build script to identify what’s wrong.

8

This is my subprojects block:

subprojects {
  apply plugin: 'groovy'
    repositories {
    mavenCentral()
  }
    dependencies {
    compile group: 'org.codehaus.groovy', name: 'groovy-all', version: '2.2.2'
    compile files("${System.properties['java.home']}/lib/ext/jfxrt.jar")
 // todo in Java 7 it is in /lib - push the calculation into a method
    testCompile group: 'org.spockframework', name: 'spock-core', version: '0.7-groovy-2.0'
  }
}

This applies the Groovy plugin to all of my subprojects, right?

9

Yeah, that should do it. Could you please provide an isolated build script that reproduces your issue? At the moment I can’t see what’s wrong.