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https://issues.apache.org/jira/browse/KARAF-5877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16586607#comment-16586607
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ASF GitHub Bot commented on KARAF-5877:
---------------------------------------
bakejeyner opened a new pull request #599: KARAF-5877 log4j2 appending error
when using log4j2 XML configuration
URL: https://github.com/apache/karaf/pull/599
See [this JIRA ticket|https://issues.apache.org/jira/browse/KARAF-5877] for
more background information.
In short, `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.
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> 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-logging
> Affects Versions: 4.2.0
> Reporter: Jacob Beyner
> 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)].
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