How to pass -parameters javac flag to Java compiler via Gradle?

Question

I have a Gradle-managed multi-project setup that relies on the new Java 8 -parameters compiler flag. I need 2 ways of including the compiler flag:

• To

Answer 1

Answer from @Crazyjavahacking is correct

Also, check that you doesn't redifine it, like me, in a subproject that uses others args (mapstruct in my case) :

options.compilerArgs = ['-Amapstruct.defaultComponentModel=spring'] // do not do this

Always append the args options.compilerArgs << '-Amapstruct.defaultComponentModel=spring'

Hope it can save some time to someone else, i personnaly lost 2 hours since i totally forgot this line in the subproject and was concentrating on the main build.gradle

Answer 2

compileJava {
  options.compilerArgs.addAll(['--release', javaVersion])
}

Answer 3

You should use standard way of configuring Java compile plugin:

apply plugin: 'java'

compileJava {
    options.compilerArgs << '-parameters'
}

Answer 4

For Android projects, one can add e.g. the below in the gradle android scope.

// Used to get more info from dagger regarding binding compile errors
// see https://github.com/google/dagger/wiki/Dagger-2.17-@Binds-bugs
tasks.withType(JavaCompile) {
    options.compilerArgs += ["-Adagger.floatingBindsMethods=enabled"]
}