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https://issues.apache.org/jira/browse/COCOON-2146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546023
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Jörg Heinicke commented on COCOON-2146:
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Can you please make it a new issue though? This one should really be only about
the serializability.
Thanks.
> 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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