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

    https://github.com/apache/incubator-brooklyn/pull/617#discussion_r30501517
  
    --- Diff: 
core/src/main/java/brooklyn/catalog/internal/BasicBrooklynCatalog.java ---
    @@ -750,7 +780,36 @@ private String setFromItemIfUnset(String oldValue, 
Map<?,?> item, String fieldAt
             return oldValue;
         }
     
    -    
    +    /** scans the given libraries for annotated items, or if null scans 
the local classpath */ 
    --- End diff --
    
    I'd prefer it if `null` does not mean "local scan". In (too) many other 
places we treat null the same as an empty list. Treating it as meaning "local" 
will be surprising.
    
    If non-null, does it scan the local classpath as well? I'm finding it hard 
to tell from the code what triggers it to scan the local classpath.


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