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https://issues.apache.org/jira/browse/JCR-3006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114758#comment-13114758
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Julian Reschke commented on JCR-3006:
-------------------------------------
OK, it seems there are two straightforward ways to fix this, depending how
important we feel it is to parallelize user creation.
(1) serialize all user/group creation, or
(2) try a retry strategy.
(2) seems to be a bit shaky due to session ownership. (1) seems to be simple.
Opinions?
> UserManager: concurrent user creation using same intermediate path fails
> ------------------------------------------------------------------------
>
> Key: JCR-3006
> URL: https://issues.apache.org/jira/browse/JCR-3006
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: security
> Affects Versions: 2.2.7
> Reporter: Stefan Guggisberg
> Attachments: ConcurrentCreateUserTest.java,
> ConcurrentCreateUserTest.java
>
>
> concurrently creating users using same intermediate path fails with "node ...
> has been modified externally".
> the problem is the intermediate path. if it doesn't exist multiple threads
> try to create it concurrently:
> o.a.jackrabbit.core.security.user.UserManagerImpl, line 1310ff:
> String[] segmts = defaultPath.split("/");
> NodeImpl folder = (NodeImpl) session.getRootNode();
> String authRoot = (isGroup) ? groupsPath : usersPath;
> for (String segment : segmts) {
> if (segment.length() < 1) {
> continue;
> }
> if (folder.hasNode(segment)) {
> folder = (NodeImpl) folder.getNode(segment);
> if (Text.isDescendantOrEqual(authRoot, folder.getPath())
> &&
> !folder.isNodeType(NT_REP_AUTHORIZABLE_FOLDER)) {
> throw new ConstraintViolationException("Invalid
> intermediate path. Must be of type rep:AuthorizableFolder.");
> }
> } else {
> Node parent = folder;
> folder = addNode(folder, session.getQName(segment),
> NT_REP_AUTHORIZABLE_FOLDER);
> }
> }
> the attached test case illustrates this issue/
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