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https://issues.apache.org/jira/browse/OAK-2900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig resolved OAK-2900.
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Resolution: Duplicate
Duplicate of OAK-2880
> Trying to remove a non existing element from a map might cause NPE
> ------------------------------------------------------------------
>
> Key: OAK-2900
> URL: https://issues.apache.org/jira/browse/OAK-2900
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segmentmk
> Reporter: Michael Dürig
> Fix For: 1.3.0
>
>
> Calling {{SegmentWriter.writeMap(base, changes)}} with {{changes}} containing
> mappings to {{null}} (meaning to remove the respective key) can result in a
> {{NPE}} if {{base}} doesn't contain that key.
> I came across this while working on the {{PersistedCompactionMap}} in
> OAK-2862. I had to add an [extra check |
> https://github.com/mduerig/jackrabbit-oak/blob/OAK-2862/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/segment/PersistedCompactionMap.java#L188]
> for above case as otherwise I'd occasionally hit said {{NPE}}.
> Need yet to extract a proper test case.
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