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

    https://github.com/apache/brooklyn-server/pull/59#discussion_r57022541
  
    --- Diff: 
core/src/main/java/org/apache/brooklyn/core/mgmt/persist/XmlMementoSerializer.java
 ---
    @@ -454,25 +460,25 @@ public Object unmarshal(HierarchicalStreamReader 
reader, UnmarshallingContext co
                     result.catalogItemId(catalogItemId);
                     return result;
                 } finally {
    -                instance = null;
    +                SpecConverterLocalInstance.remove();
                     if (customLoaderSet) {
                         popXstreamCustomClassLoader();
                     }
                 }
             }
     
    -        Object instance;
    -        
             @Override
             protected Object instantiateNewInstance(HierarchicalStreamReader 
reader, UnmarshallingContext context) {
                 // the super calls getAttribute which requires that we have 
not yet done moveDown,
                 // so we do this earlier and cache it for when we call 
super.unmarshal
    +            Object instance = SpecConverterLocalInstance.get();
    --- End diff --
    
    I believe you can put arbitrary objects in the `context`, just for cases 
like this.


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