In NamingContext implementation, if "lookup()" is a Reference, current
implementation caches the result of the NamingManager # getObjectInstance via
following statements and changes the type of the entry. In the following
lookups, same object is returned. I would like to write ObjectFactory that
returns new instance for each time lookup is called on its reference. But with
the current implementation, it is not possible to write such an object factory
because of aferomentioned sitaution. I think that entry must be stay as
Reference instead of changing entry type.

NamingContext class:

protected Object lookup(Name name, boolean resolveLinks)
        throws NamingException {
.....
            } else if (entry.type == NamingEntry.REFERENCE) {
                try {
                    Object obj = NamingManager.getObjectInstance
                        (entry.value, name, this, env);
                    if (obj != null) {
                        entry.value = obj;                           
                        entry.type = NamingEntry.ENTRY;  ---> CHANGES type of
the naming entry
                    }
                    return obj;
                } catch (NamingException e) {
                    throw e;
                } catch (Exception e) {
                    log.warn(sm.getString
                            ("namingContext.failResolvingReference"), e);
                    throw new NamingException(e.getMessage());
                }
            }

...........
}