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From "Ellis Pritchard (JIRA)" <>
Subject [jira] Created: (COCOON-2146) Using EventAware cache implementation breaks persistent cache restore on restart
Date Fri, 09 Nov 2007 17:57:50 GMT
Using EventAware cache implementation breaks persistent cache restore on restart

                 Key: COCOON-2146
             Project: Cocoon
          Issue Type: Bug
          Components: Blocks: Event Cache
    Affects Versions: 2.1.10, 2.1.11-dev (Current SVN)
            Reporter: Ellis Pritchard

In revision 412307 (Cocoon 2.1.10), AbstractDoubleMapEventRegistry and EventRegistryDataWrapper
were changed (without an informative SVN comment!) to use the commons MultiValueMap instead
of the MultiHashMap; I presume this was done in good faith because the latter map is deprecated
and will be removed from Apache commons-collections 4.0

However, as a result, the persistent cache cannot be restored if the EventAware cache implementation
is used, since MultiValueMap is not Serializable! The old MultiHashMap was...

Depending on whether StoreEventRegistryImpl or DefaultEventRegistryImpl is used, either the
event cache index is never written (ehcache doesn't store non-serializable objects on disk),
or a is thrown (and caught, causing a full cache-clear) when
attempting to restore the event cache index.

This is Major for us, since we use Event-based caching alot, and this is causing the *entire*
cache to no-longer persist across restarts (it's been like that for 8 months, since I upgraded
Cocoon to 2.1.10 in the last week I was working here, and now I'm back, they've actually noticed!!)

Work-around at the moment is to down-grade AbstractDoubleMapEventRegistry and EventRegistryDataWrapper
to the 2.1.9 versions (pre-412307), which works so long as Apache-commons 3.x is still in

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