Using EventAware cache implementation breaks persistent cache restore on restart
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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, 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 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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