Intellij 9 and Gradle - No Fluff Just Stuff

Intellij 9 and Gradle

Posted by: Ken Sipe on December 14, 2009

One of the hidden gems of the Intellij 9 release is it's support for Gradle. Some of the information on the web is out of date and some features are not intuitive. This post will detail some of the nuances and follow it up with a wish list for the next update :)

Gradle Support
The information from JetBrains is out of date. In order to setup gradle after the GA release, all you need to do is configure the gradle home under File -> Other Settings -> Template Setttings.


Gradle Intellij Nuances
After setting up IDEA to work with Gradle, you'll need a build file. I didn't discover a way to create a gradle build file from IDEA. Just create a new file and name it "build.gradle" in the root of the module directory structure.

When writing the build script, Intellij expects to work with gradle in a way that is depreciated. It will pick up on a createTask(..) method. If the cursor is on a task such as this, and you hit ctrl+shft+F10, it will auto-discover and run that task in the script. (cool stuff)

Hotkeys to know:
ctrl+shft+F10 - runs task the cursor is on
shft+F10 - runs the last script (or the last run)
alt+shft+F10 - pops up a run menu (with all previously run gradle run configs)

The figure below shows an alt+shft+F10 when the cursor is on a task called task2.


If you code gradle in a non-depreciated way... then IDEA does not auto-discover the tasks. Below is what one would expect in a gradle build file:

usePlugin 'java'

repositories {
mainCentral()
}

// from the gradle user guide
// http://www.gradle.org/0.8/docs/userguide/tutorial_using_tasks.html
task hello << {
println 'Hello world'
}
task intro(dependsOn: hello) << {
println "I'm Gradle"
}

Tasks would normally be created this way... It is still great that IDEA has gradle support in general regardless of this oversight. After a run configuration is configured with a targeted task, it worlds with no pain. Also you could add:
 defaultTasks "intro"
and gradle runs this as the fallback when IDEA doesn't provide the required task.

Intellij / Gradle features I'm looking forward to:
  1. IDEA understands proper task configuration
  2. IDEA makes it easy to create new projects with a structure maven and gradle expects.
  3. IDEA treats gradle as a peer with Maven and Ant. This includes:
    a. Gradle Window (similar to the ant build and maven projects panels)
    b. Before Launch Gradle tasks in the run configurations

Ken Sipe

About Ken Sipe

Ken is a distributed application engineer. Ken has worked with Fortune 500 companies to small startups in the roles of developer, designer, application architect and enterprise architect. Ken's current focus is on containers, container orchestration, high scale micro-service design and continuous delivery systems.

Ken is an international speaker on the subject of software engineering speaking at conferences such as JavaOne, JavaZone, Great Indian Developer Summit (GIDS), and The Strange Loop. He is a regular speaker with NFJS where he is best known for his architecture and security hacking talks. In 2009, Ken was honored by being awarded the JavaOne Rockstar Award at JavaOne in SF, California and the JavaZone Rockstar Award at JavaZone in Oslo, Norway as the top ranked speaker.

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