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From: Michael Harrison <michael_harrison@persistent.com>
To: "users@jackrabbit.apache.org" <users@jackrabbit.apache.org>
Subject: How to avoid Exception:Aborting getChildNodes() - DocumentNodeState
 is null
Thread-Topic: How to avoid Exception:Aborting getChildNodes() -
 DocumentNodeState is null
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Date: Thu, 17 Aug 2017 18:04:50 +0000
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We are using Oak 1.6.1 with an repository that is supported by a MongoDB ba=
ck end. We are doing a bulk upload of assets from an FTP site and creating =
versioned assets in the repository, where the asset nodes have the followin=
g structure:


// Node "assetName", jcr:primaryType=3Dnt:file, jcr:mixinTypes=3Dmix:xxx   =
        assetNode
//   Properties: jcr:mimeType - the MIME type
//               mix:size - the size of the asset file, in bytes
//               mix:metadataNames - the metadata names as a delimited stri=
ng
//               mix:metadataValues - the metadata values as a delimited st=
ring
//   Node "content", jcr:primaryType=3Dnt:resource                         =
       contentNode (child)
//     Properties: jcr:data - the actual asset bytes


All the assets are of type .jpg. There are several concurrent threads that =
read files from the FTP site and create assets.


For some assets, when doing a Session.save() prior to checkin we get the fo=
llowing exception (stack trace snipped for compactness):


org.apache.jackrabbit.oak.plugins.document.DocumentStoreException: Aborting=
 getChildNodes() - DocumentNodeState is null for br15daca61b5b-0-2 at /:con=
flict/changeDeletedNode/Unassigned/sequence_of_attributes_works_fine - Copy=
 (2).png
    at org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$7.apply=
(DocumentNodeStore.java:1201)
        ...
    at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.performVoid(S=
essionDelegate.java:274)
    at org.apache.jackrabbit.oak.jcr.session.SessionImpl.save(SessionImpl.j=
ava:416)


I have seen a number of defect reports concerning "DocumentNodeState is nul=
l", but they all seem to have been fixed.


Can someone help me to find out what we are doing wrong that causes this ex=
ception?


Mike Harrison


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