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https://issues.apache.org/jira/browse/JCR-1552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591769#action_12591769
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Julian Reschke commented on JCR-1552:
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The example that I started with did that.
> Concurrent conflicting property creation sometimes doesn't fail
> ---------------------------------------------------------------
>
> Key: JCR-1552
> URL: https://issues.apache.org/jira/browse/JCR-1552
> Project: Jackrabbit
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: core 1.4.2
> Reporter: Thomas Mueller
> Assignee: Stefan Guggisberg
> Fix For: 1.5
>
>
> The following test prints "Success":
> Session s1 = ...
> Session s2 = ...
> s1.getRootNode().setProperty("b", "0"); // init with zero
> s1.getRootNode().setProperty("b", (String) null); // delete
> s1.save();
> s1.getRootNode().setProperty("b", "1");
> s2.getRootNode().setProperty("b", "2");
> s1.save();
> s2.save();
> System.out.println("Success");
> However if the line marked "... // delete" is commented out,
> it fails with the following exception:
> javax.jcr.InvalidItemStateException:
> cafebabe-cafe-babe-cafe-babecafebabe/{}b: the item cannot be saved
> because it has been modified externally.
> at
> org.apache.jackrabbit.core.ItemImpl.getTransientStates(ItemImpl.java:246)
> at org.apache.jackrabbit.core.ItemImpl.save(ItemImpl.java:928)
> at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:849)
> It should fail in all cases. If we decide it shouldn't fail, it needs to be
> documented.
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