Github user dkulp commented on the issue:
https://github.com/apache/cxf/pull/262
I actually think doing "both" would be the right thing to do. The fix in
this PR is likely correct as calling remove with a null key is pointless as
there shouldn't ever be a null "Set" of classes as a key in the cache.
Possibly and empty set, but likely not a null set.
However, protecting against it in the CacheMap is also a good thing.
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