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amin zamani commented on OAK-4911: ---------------------------------- Hi Marcel, thank you very much for investigating with me your time in this issue -> thanks for your help! I have attached attached the java Class "JCROakTest.java" to this ticket. There are maybe only 3 Things you may modify at the beginning of the class: private static Mongo mongo = new MongoClient("localhost"); private static String databaseName = "jcr-dev"; private String mixinDefs = "/mixin-definitions.cnd"; Inside the main start method (public static void main) you see that I create a document with no thread - that works. And then afterward I create a document inside a thread. The same code but only inside a thread. But unfortunately now I have the problem that the document creation inside the thread shows to me the error: => Exception in thread "Thread-1" java.lang.RuntimeException: javax.jcr.RepositoryException: This session has been closed. I use the same logic, exactly the same code inside our web application, the same kind of session but I don't know why we get in our webapp this error: Caused by: javax.jcr.PathNotFoundException: noah:createdBy not found on /jcr:system/jcr:versionStorage/d2/88/43/d28843a2-c666-4936-b08b-e53912da4ecf/1.0/jcr:frozenNode However, I think when we are able to fix the first problem (session closed) then the second error will appear. Thank you very much for your appreciated help! Shalom Amin > 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 > -------------------------- -- This message was sent by Atlassian JIRA (v6.3.4#6332)