Default value for a $PROPERTY in Gradle

Question

How can I specify a default value for this simple build.gradle script:

println "Hello $build_version"  

So that I don't get the error:

A problem occurred evaluating root project 'hello_gradle'. > Could not find property '$build_version' on root project 'hello_gradle'. 

I tried some of the operators, checking for nulls etc, but I think just the reference to the property makes it fail. I could fix that by always providing the property, but that's less than ideal.

gradle -Pbuild_version=World 

Answer 1

if (!project.hasProperty("build_version")) {     ext.build_version = "1.0" }