[jira] [Resolved] (OAK-2900) Trying to remove a non existing element from a map might cause NPE

["Michael Dürig (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-2900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Dürig resolved OAK-2900.
--------------------------------
    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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