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https://issues.apache.org/jira/browse/OAK-5002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15605416#comment-15605416
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Michael Dürig commented on OAK-5002:
------------------------------------
This is a regression introduced with OAK-4450. Before {{FileStore.getWriter}}
was {{@Nonnull}}. Now that method returns null in the case of the read only
store. This causes problems when passing a read only store to
{{SegmentNodeStore#builder}}.
> NPE when creating read only store
> ---------------------------------
>
> Key: OAK-5002
> URL: https://issues.apache.org/jira/browse/OAK-5002
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Fix For: Segment Tar 0.0.18
>
>
> Using
> {{org.apache.jackrabbit.oak.segment.SegmentNodeStoreBuilders#builder(org.apache.jackrabbit.oak.segment.file.ReadOnlyFileStore)}}
> to create a read only store results in a NPE:
> {noformat}
> Exception in thread "main" java.lang.NullPointerException
> at
> com.google.common.base.Preconditions.checkNotNull(Preconditions.java:192)
> at
> org.apache.jackrabbit.oak.segment.SegmentNodeStore.builder(SegmentNodeStore.java:148)
> at
> org.apache.jackrabbit.oak.segment.SegmentNodeStoreBuilders.builder(SegmentNodeStoreBuilders.java:69)
> {noformat}
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