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Is it maybe the

gradleProperty

produced provider that has no value as you set the Gradle property for bugpatterns, but not the one for nullaway?

Hi @Vampire, thanks for your reply. I’m not sure I understand your question, can you explain

I have no idea what

createCastedProvider

does. But you use

project.getProviders().gradleProperty

in what you showed to get the value of a project property. The requested project properties for

getEnableBugpatterns

and

getEnableNullAway

are most probably different I assume. So if you change everything to

getEnableBugpatterns

and it works while with

getEnableNullAway

it fails with empty provider, my assumption is, that the project property for the former is set while the one for the latter is not.

Actually, I found something, the only difference is the default value, the “nullaway” one is “false” which means the

if

inside the

Callable

in the following code evaluates to false. This is surprising as I saw in @melix blog post that this is possible for conditional addition of dependencies :

private void addDependencyProvider(
    Project project, String configuration, Property<Boolean> property, String dependency) {
  project
      .getDependencies()
      .addProvider(
          configuration,
          project.provider(
              (Callable<Object>)
                  () -> {
                    if (property.get()) {
                      return dependency;
                    } else {
                      return null;
                    }
                  }));
}

It is. However I need to update my blog post, because I found that depending on the situation, returning

null

may or may not work. So nowadays, I'm using

addAllLater

and systematically return a list of dependencies, which can be empty.

I will give it a try, thanks a lot!