in arthur-spi/src/main/java/org/apache/geronimo/arthur/spi/model/ClassReflectionModel.java [122:127]
private <T> Collection<T> merge(final Collection<T> v1, final Collection<T> v2) {
if (v1 == null && v2 == null) {
return null;
}
return Stream.of(v1, v2).filter(Objects::nonNull).flatMap(Collection::stream).distinct().collect(toList());
}