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

You should use standard way of configuring Java compile plugin:

apply plugin: 'java'

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

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"]
}