* constructor can write to it.
     */
    @InputFiles
    @SkipWhenEmpty
    @PathSensitive(PathSensitivity.RELATIVE)
    public List<FileCollection> getJavaFiles() {
        return getSourceFolders().get();
    }

    @Internal
    public abstract ListProperty<FileCollection> getSourceFolders();

    public File getReportFile() {
        return reportFile;
    }