Better error handling when a property is not set

I am playing a bit with Gradle and wanted to have a “profile property” like thingy. I use the following code found on SO:

// define the profileProperties. This is basically the profile and properties like in maven
def profileProperties = [
 test:[prop1:"devValue1", prop2:"devValue2"],
 prod:[prop1:"prodValue1", prop2:"prodValue2"]
  // define usedProfile as a global then test if it is set from the command line. If not, then set it to dev
def usedProfile
if (project.hasProperty("profile")) {
 usedProfile = project.getProperty("profile")
} else {
 usedProfile = 'dev'
  task showProfile << {
 println usedProfile
  // Tell processResources to handle this.

When a property is not set in the profileProperties Gradle will stop with:

* What went wrong:
Execution failed for task ':processResources'.
> Could not copy file 'C:\Users\Ron\src\eveasset\src\main\resources\META-INF\per
sistence.xml' to 'C:\Users\Ron\src\eveasset\build\resources\main\META-INF\persis

You have to run it with --stackTrace and then search through that to find: * What went wrong: Execution failed for task ‘:processResources’. * What went wrong: Execution failed for task ‘:processResources’. Caused by: groovy.lang.MissingPropertyException: No such property: db for class:


Methinks this might be a tad more userfriendly?

Just something to note. Your if-then-else can be accomplished in a much more groovy way:

def usedProfile = project.getProperty("profile") ?: "dev"

It is a simplification of the java ternary operation, and is known as the Elvis operator.

Hope this helps even if not directly relating to the original question.

That is an excellent idea, maybe I should start reading some groovy stuff :slight_smile:


so that code actually does not work. Execution stops with

* What went wrong:
A problem occurred evaluating root project 'eveasset'.
> Could not find property 'profile' on root project 'eveasset'.

So I decided to write it the java way and that works

def usedProfile = project.hasProperty("profile") ? project.getProperty("profile"): "dev"