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https://issues.apache.org/jira/browse/COCOON-2146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545962
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Ard Schrijvers commented on COCOON-2146:
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Hmmmm, I am really confident that persistent caches with the event registry
used to work (we have used it for years until i disabled it...but the last time
i used it was with 2.1.8, so not sure if something changed :-) ). A restart did
use to work. You are really sure that you have a restart persistent cache
configuration?
"I've tracked this down to the fact that
AbstractDoubleMapEventRepository#dispose() which performs the persist(), then
immediately clear()s the maps, WHICH HAVEN'T YET BEEN WRITTEN TO DISK BY
EHCACHE SHUTDOWN! "
This shouldn't matter. When the registry is persisted, you can clear the double
maps. The cache takes care of persisting itself. Can you comment your <store>
configuration of your ehcache?
Can you confirm, that on disk, in your work dir after shutdown, you have
serialized ehcache files? Can you also confirm you have (i think in the WEB-INF
dir somewhere) serialized .ser registry files. Open them with notepad to see
that they contain some data if you want....
At startup, I know that for every entry in the registry, the cachekey is
checked wether it is still present in the cache. When not, the registry of this
cachekey is discarded. I think you have a problem somewhere in this (though
depends on wether your .ser files are empty or not...if empty, the problem is
ofcourse in the shutdown)
> Using EventAware cache implementation breaks persistent cache restore on
> restart
> --------------------------------------------------------------------------------
>
> Key: COCOON-2146
> URL: https://issues.apache.org/jira/browse/COCOON-2146
> Project: Cocoon
> Issue Type: Bug
> Components: Blocks: Event Cache
> Affects Versions: 2.1.10
> Reporter: Ellis Pritchard
> Assignee: Jörg Heinicke
> Priority: Minor
> Fix For: 2.1.11-dev (Current SVN)
>
> Attachments: patch.txt
>
>
> 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 java.io.NotSerializableException 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 use.
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