CODEWITHSUNDEEP
groovygradle
Jens D
Jens D

Reputation: 4676

How to access a Gradle configurations object correctly

First off, this is my first foray into Gradle/Groovy (using Gradle 1.10). I'm setting up a multi-project environment where I'm creating a jar artifact in one project and then want to define an Exec task, in another project, which depends on the created jar. I'm setting it up something like this:

// This is from the jar building project
jar {
  ...
}
configurations {
  loaderJar
}
dependencies {
  loaderJar files(jar.archivePath)
  ...
}

// From the project which consumes the built jar
configurations {
  loaderJar
}
dependencies {
  loaderJar project(path: ":gfxd-demo-loader", configuration: "loaderJar")
}
// This is my test task
task foo << {
  configurations.loaderJar.each { println it }
  println configurations.loaderJar.collect { it }[0]
  // The following line breaks!!!
  println configurations.loaderJar[0]
}

When executing the foo task it fails with:

> Could not find method getAt() for arguments [0] on configuration ':loaderJar'.

In my foo task I'm just testing to see how to access the jar. So the question is, why does the very last println fail? if a Configuration object is a Collection/Iterable then surely I should be able to index into it?

Upvotes: 0

Views: 483

Answers (1)

Peter Niederwieser
Peter Niederwieser

Reputation: 123920

Configuration is-a java.util.Iterable, but not a java.util.Collection. As can be seen in the Groovy GDK docs, the getAt method (which corresponds to the [] operator) is defined on Collection, but not on Iterable. Hence, you can't index into a Configuration.

Upvotes: 2

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