amin zamani commented on OAK-4911:

and then the last method which is called inside of createDocument(..) is 
=> In this method the exception is thrown:

private Document toDocument(Node documentNode) {
        try {
            Node file = null;
            String identifier = null;

            // flag to show if current node is already versioned
            boolean isVersioned = true;

            if( documentNode instanceof Version ){ //Versioned node
                file = documentNode.getNode(Node.JCR_FROZEN_NODE);
                identifier = JcrUtil.getStringProperty(file, 
            }else{ //unversioned node
                file = documentNode;
                isVersioned = false;
                identifier = documentNode.getIdentifier();

            Node fileContent = file.getNode(Property.JCR_CONTENT);
            String versionName = documentNode.getName();
            ZonedDateTime creationDate = 
            ZonedDateTime lastModificationDate = 
            String createdBy = JcrUtil.getStringProperty(file, 
            String lastModifiedBy = JcrUtil.getStringProperty(fileContent, 
            String title = JcrUtils.getStringProperty(file, Property.JCR_TITLE, 
            String description = JcrUtils.getStringProperty(file, 
Property.JCR_DESCRIPTION, null);
            String entityUrl = JcrUtil.getStringProperty(file, 
            String documentTypeValue = JcrUtils.getStringProperty(file, 
CustomProperty.NOAH_DOCUMENT_TYPE_VALUE, null);
            String documentTypeLabel = JcrUtils.getStringProperty(file, 
CustomProperty.NOAH_DOCUMENT_TYPE_LABEL, null);
            ValueListEntry documentType = isNoneEmpty(documentTypeValue, 
documentTypeLabel) ? new ValueListEntry(documentTypeValue, documentTypeLabel) : 
            String contentType = JcrUtil.getStringProperty(fileContent, 
            long fileSize = 
            String previewType = JcrUtils.getStringProperty(file, 
CustomProperty.NOAH_PREVIEW_TYPE, null);

            return new Document(identifier,previewType, versionName, 
creationDate, lastModificationDate, createdBy, lastModifiedBy, title, 
description, entityUrl, documentType, contentType, fileSize);
        } catch (RepositoryException e) {
            throw new RuntimeRepositoryException(e);

> Can not read node Property when move code into a Thread (Java)
> --------------------------------------------------------------
>                 Key: OAK-4911
>                 URL: https://issues.apache.org/jira/browse/OAK-4911
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>    Affects Versions: 1.3.10
>         Environment: MAC OS X
>            Reporter: amin zamani
>         Attachments: java-code.txt
> Hallo,
> we develop an application and everything is working as it should. We upload 
> documents and for each document a new preview file (node) should be 
> generated. It works well when we execute the code synchron. But because of 
> the fact that the generation of a preview file (like PDF format) can take 
> very long time we decided to move the preview generation code into a usual 
> java thread so that after the user is upload a document the website is 
> responding very quick and does not wait till the preview file is generated 
> but the preview file is generated parallel. 
> No the problem: As soon as I move the same code regarding to the preview file 
> generation into a usual thread (no modifications to the logic, only a thread 
> is bordered to it) suddenly the node path does not exist, this is the error:
> -----------------
> Caused by: javax.jcr.PathNotFoundException: jcr:lastModifiedBy not found on 
> /jcr:system/jcr:versionStorage/7e/f8/5b/7ef85b25-4598-4476-82df-446eb3a08a90/1.0/jcr:frozenNode/jcr:content
>       at 
> org.apache.jackrabbit.oak.jcr.session.NodeImpl$11.perform(NodeImpl.java:631)
>       at 
> org.apache.jackrabbit.oak.jcr.session.NodeImpl$11.perform(NodeImpl.java:625)
>       at 
> org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.perform(SessionDelegate.java:207)
>       at 
> org.apache.jackrabbit.oak.jcr.session.ItemImpl.perform(ItemImpl.java:112)
>       at 
> org.apache.jackrabbit.oak.jcr.session.NodeImpl.getProperty(NodeImpl.java:625)
>       at 
> com.westernacher.noah.util.content_repository.JcrUtil.getStringProperty(JcrUtil.java:35)
> ---------------------------
> In my point of view this is a bug. This is the code that works:
> Example:
> /// 1) User Upload document through browser in our web app..
> // 2) ... document uploaded and saved in OAK CR
> // 3) Now generate the preview:
> updateDocumentPreview(documentId);
> --------------------------------
> Now the same in a thread that does not work:
> => I have only moved the method "updateDocumentPreview(documentId);" in a 
> Thread (Java 8):
> //Same code as before except the last line replaced by following lines:
> Runnable run = ()-> {updateDocumentPreview(documentId);}
> new Thread(run).start(); //Start the thread to generate a document preview
> --------------------------

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