btw:

this is not just an issue of debugging - other methods like the various 'printInfo()' 
(even in TreeCache()) eventually throwsConcurrentModificationException when being 
called while the cache is in use.

If we want to keep the underlying Collections unsynchronized for performance-reasons, 
we must never pass references to them. methods like 'LockMap.readerOwners()' are a 
'must not' in respect to concurrency.

I guess all the synchronizing must be carefully reviewed before this may go gold.

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