_impl and _fieldImpl are space for implementations to store impl-specific data about the object or its fields. I don't recall whether Kodo/OpenJPA currently uses this feature. Custom mappings might.
On Thu, 2008-08-14 at 13:36 -0700, catalina wei wrote: > Hi all, > In order to develop a DataCache plugins of our own, we need to understand > the 2 fields in the PCDataImpl.java, _impl and _fieldImpl: > private Object _impl = null; > private Object[] _fieldImpl = null; > > Under the debugger with the DataCache enabled, I have not seen these 2 > fields ever set.
