Github user geomacy commented on a diff in the pull request:

    https://github.com/apache/brooklyn-server/pull/612#discussion_r109126372
  
    --- Diff: 
camp/camp-brooklyn/src/main/java/org/apache/brooklyn/camp/brooklyn/spi/creation/BrooklynEntityDecorationResolver.java
 ---
    @@ -227,7 +234,55 @@ protected Object 
getDecorationAttributeJsonValue(ConfigBag attrs) {
     
             @Override
             protected void addDecorationFromJsonMap(Map<?, ?> decorationJson, 
List<SpecParameter<?>> decorations) {
    -            throw new IllegalStateException("Not called");
    +            throw new 
UnsupportedOperationException("SpecParameterResolver.addDecorationFromJsonMap 
should never be called.");
    +        }
    +    }
    +
    +    public static class TagsResolver extends 
BrooklynEntityDecorationResolver<Iterable<Object>> {
    +        protected TagsResolver(BrooklynYamlTypeInstantiator.Factory 
instantiator) {
    +            super(instantiator);
    +        }
    +
    +        @Override
    +        public void decorate(EntitySpec<?> entitySpec, ConfigBag attrs, 
Set<String> encounteredRegisteredTypeIds) {
    +            Object decorationAttributeJsonValue = 
getDecorationAttributeJsonValue(attrs);
    +            if (decorationAttributeJsonValue != null) {
    +                
entitySpec.tagsAdd((Iterable<Object>)decorationAttributeJsonValue);
    +            }
    +        }
    +
    +        @Override
    +        protected String getDecorationKind() {
    +            return "Brooklyn Tags";
    +        }
    +
    +        @Override
    +        protected Object getDecorationAttributeJsonValue(ConfigBag attrs) {
    +            Object brooklynTags = 
attrs.getStringKey(BrooklynCampReservedKeys.BROOKLYN_TAGS);
    +            if (brooklynTags == null) {
    +                return null;
    +            } else if (!(brooklynTags instanceof List)) {
    +                throw new 
IllegalArgumentException(BrooklynCampReservedKeys.BROOKLYN_TAGS + " should be a 
List of String elements. You supplied " + brooklynTags);
    +            } else {
    +                checkArgument(Iterables.all((List) brooklynTags, new 
Predicate() {
    +                    @Override
    +                    public boolean apply(@Nullable Object input) {
    --- End diff --
    
    Why is this marked nullable?


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