[Demonstration 1]

[Buggy Method]
@Override
public String toString() {
    return super.toString() + " [on=" + on + "]";
}

[Buggy Hunk]
return super.toString() + " [on=" + on + "]";

[Patch]
return "LightParams [on=" + on + "]";

[Demonstration 2]

[Buggy Method]
@Override
public String toString() {
    return "entity.Hobby[ id=" + id + " ]";
}

[Buggy Hunk]
return "entity.Hobby[ id=" + id + " ]";

[Patch]
return "Hobby{" + "id=" + id + ", name=" + name + ", description=" + description + '}';

[Demonstration 3]

[Buggy Method]
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch(item.getItemId()) {
        case R.id.menu_item_new_crime:
            Crime crime = Crime.builder().id(generateUniqueIdentifier()).date(new Date()).solved(false).title("").build();
            CrimeController.getInstance().insertCrime(crime);
            startActivity(getCrimePagerActivityIntent(crime));
            return true;
        case R.id.menu_item_show_subtitle:
            subtitleVisible = !subtitleVisible;
            getActivity().invalidateOptionsMenu();
            updateSubtitile();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

[Buggy Hunk]
.id(generateUniqueIdentifier())

[Patch]
.id(UUID.randomUUID().toString())