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https://issues.apache.org/jira/browse/KARAF-5877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16620417#comment-16620417
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Freeman Fang commented on KARAF-5877:
-------------------------------------
Hi Jacob,
Firstly, thanks for the patch!
However somehow I can't reproduce this org.w3c.dom.DOMException with Karaf
4.2.1, could you please test with Karaf 4.2.1?
If the problem still exists, could you please append the etc/log4j2.xml you
used?
Thanks
Freeman
> log4j2 appending error when using log4j2 XML configuration
> ----------------------------------------------------------
>
> Key: KARAF-5877
> URL: https://issues.apache.org/jira/browse/KARAF-5877
> Project: Karaf
> Issue Type: Bug
> Components: karaf
> Affects Versions: 4.2.0
> Reporter: Jacob Beyner
> Assignee: Freeman Fang
> Priority: Trivial
> Fix For: 4.2.0
>
>
> {{LogServiceLog4j2XmlImpl}} will throw an {{org.w3c.dom.DOMException:
> NOT_FOUND_ERR}} when the corresponding log4j2 configuration file has an
> element with children as the last element in the {{<Loggers>}} element. This
> causes the {{log:tail}} command to display the logs and error out immediately.
> The reason for this is the {{LogServiceLog4j2XmlImpl.insertIndented}} method.
> It will eventually execute [this
> line|https://github.com/apache/karaf/blob/master/log/src/main/java/org/apache/karaf/log/core/internal/LogServiceLog4j2XmlImpl.java#L159],
> responsible for throwing the error.
> This is because the {{loggers}} object is a flat collection of the
> {{Loggers}} element's children, and the {{insertAfter}} Node *can* be a
> nested child instead of a first level child. Then, when
> {{loggers.insertBefore(node, insertAfter.getNextSibling())}} is called, and
> {{insertAfter}} is not a first level child of the {{Loggers}} element, the
> exception is thrown. [This is becuase the {{Node.insertBefore}} method
> requires the second argument to be a direct child of the node calling the
> method|https://docs.oracle.com/javase/7/docs/api/org/w3c/dom/Node.html#insertBefore(org.w3c.dom.Node,%20org.w3c.dom.Node)].
> Steps to Reproduce:
> 1. Complete the steps in section `Log4j v2 support` of the [Karaf
> documentation|https://karaf.apache.org/manual/latest/].
> 2. Attempt to `log:tail` in the Karaf console.
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