Could not get unknown property 'errorprone' for object of type org.gradle.api.tasks.compile.CompileOptions.

[boris-petrov]

I've been using the other plugin until now (net.ltgt.errorprone) but I decided to give this one a try with JDK9. I only change id 'net.ltgt.errorprone' version '0.0.14' to id 'net.ltgt.errorprone-javacplugin' version '0.2' and add options.errorprone.disableWarningsInGeneratedCode = true in my tasks.withType(JavaCompile) and I get the error from the title:

Could not get unknown property 'errorprone' for object of type org.gradle.api.tasks.compile.CompileOptions.

I'm not sure what I am doing wrong. Any ideas?

P.S. JDK 9.0.4 and Gradle 4.7.

[tbroyer]

I cannot reproduce; can you share a project that reproduces the issue? What other plugins are you using? (including the built-in ones such as the java or java-library plugin)

[boris-petrov]

I thought it could be because of another plugin. And yes, it is. Adding id 'me.champeau.gradle.jmh' version '0.4.5' breaks it. Any ideas why and where the problem might be?

[tbroyer]

me.champeau.gradle.jmh plugin creates a jmhCompileGeneratedClasses JavaCompile task that's not "linked" to any source set, so the extension is not automatically applied to it, as its options.annotationProcessorPath is not guaranteed to be set to contain Error Prone (and indeed it's left empty/null). You need to explicitly enable Error Prone on that task if you want it, and set its options.annotationProcessorPath. Something like:

jmhCompileGeneratedClasses {
  ErrorProneJavacPlugin.apply(options)
  options.annotationProcessorPath = configurations.errorprone
}

Then you'll be able to use options.errorprone.… in your tasks.withType(JavaCompile).

See the note about “custom JavaCompile tasks” in the README.

[tbroyer]

Fwiw, I just published v0.4 that applies the options.errorprone extension to all JavaCompile tasks, so tasks.withType(JavaCompile) { options.errorprone { … } } will no longer fail, even in the presence of the JMH plugin. For tasks that are not "linked" to a source set, options.errorprone.enabled defaults to false, so the JMH task won't use Error Prone. If you want it to use Error Prone too, then you can do:

jmhCompileGeneratedClasses {
  options.annotationProcessorPath = configurations.errorprone
  options.errorprone.enabled = true
}

README has been updated.

(also please note that ErrorProneJavacPlugin.apply(options) API has been removed)