runtime/src/main/java/org/echocat/jomon/runtime/CollectionUtils.java
@Nonnull
    public static <T> Set<T> asImmutableSet(@Nullable T... objects) {
        return addAllAndMakeImmutable(new HashSet<T>(), objects);
    }
@Nonnull
    public static <T> Set<T> asImmutableSet(@Nullable T... objects) {
        return addAllAndMakeImmutable(new HashSet<T>(), objects);
    }
Returns an unmodifiable {@link Set} containing the given <code>objects</code>,
returns an empty Set, if <code>objects</code> is null.