[jira] [Created] (OAK-4911) Can not read node Property in a Thread (Java)

["amin zamani (JIRA)" <ji...@apache.org>]

amin zamani created OAK-4911:
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             Summary: Can not read node Property in 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


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:

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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)
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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);
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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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