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https://issues.apache.org/jira/browse/OAK-4107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15352398#comment-15352398
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Chetan Mehrotra commented on OAK-4107:
--------------------------------------
[~egli] One possible explanation for this can be that command execution
returned some exception but the code does not check for CommandResult being ok.
So may be the code must check for command result and handle any error there.
> NPE in MongoDocumentStore.determineServerTimeDifferenceMillis
> -------------------------------------------------------------
>
> Key: OAK-4107
> URL: https://issues.apache.org/jira/browse/OAK-4107
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: mongomk
> Reporter: Chetan Mehrotra
> Assignee: Stefan Egli
> Priority: Minor
> Labels: candidate_oak_1_4
> Fix For: 1.6, 1.5.2
>
> Attachments: OAK-4107.patch
>
>
> On system startup with Mongo following exception is seen
> {noformat}
> 07.03.2016 06:26:10.529 *WARN* [FelixStartLevel]
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService
> registerNodeStore: got RuntimeException while trying to determine time
> difference to server: java.lang.NullPointerException
> java.lang.NullPointerException: null
> at
> org.apache.jackrabbit.oak.plugins.document.mongo.MongoDocumentStore.determineServerTimeDifferenceMillis(MongoDocumentStore.java:1568)
> at
> org.apache.jackrabbit.oak.plugins.document.util.LeaseCheckDocumentStoreWrapper.determineServerTimeDifferenceMillis(LeaseCheckDocumentStoreWrapper.java:203)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService.registerNodeStore(DocumentNodeStoreService.java:514)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService.registerNodeStoreIfPossible(DocumentNodeStoreService.java:371)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStoreService.bindBlobStore(DocumentNodeStoreService.java:554)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> {noformat}
> Per code {{serverLocalTime}} appears to be null
> {code}
> final Date serverLocalTime = db.command("serverStatus").getDate("localTime");
> final long end = System.currentTimeMillis();
> final long midPoint = (start + end) / 2;
> final long serverLocalTimeMillis = serverLocalTime.getTime();
> {code}
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