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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KARAF-5877) log4j2 appending error when using log4j2 XML configuration
Date Wed, 22 Aug 2018 15:58:00 GMT

    [ https://issues.apache.org/jira/browse/KARAF-5877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16589063#comment-16589063

ASF GitHub Bot commented on KARAF-5877:

bakejeyner closed pull request #599: KARAF-5877 log4j2 appending error when using log4j2 XML
URL: https://github.com/apache/karaf/pull/599

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):

diff --git a/log/src/main/java/org/apache/karaf/log/core/internal/LogServiceLog4j2XmlImpl.java
index 843bf51502..d50eea4108 100644
--- a/log/src/main/java/org/apache/karaf/log/core/internal/LogServiceLog4j2XmlImpl.java
+++ b/log/src/main/java/org/apache/karaf/log/core/internal/LogServiceLog4j2XmlImpl.java
@@ -136,8 +136,7 @@ else if (!Level.isDefault(level)) {
      * indenting it as needed.
     static void insertIndented(Element loggers, Element element, boolean atBeginning) {
-        NodeList loggerElements = loggers.getElementsByTagName("*");
-        if (atBeginning && loggerElements.getLength() > 0) {
+        if (atBeginning && loggers.hasChildNodes()) {
             Node insertBefore = loggers.getFirstChild();
             if (insertBefore != null) {
                 if (insertBefore.getNodeType() == Node.TEXT_NODE) {
@@ -150,7 +149,7 @@ static void insertIndented(Element loggers, Element element, boolean atBeginning
         } else {
-            Node insertAfter = loggerElements.getLength() > 0 ? loggerElements.item(loggerElements.getLength()
- 1) : null;
+            Node insertAfter = loggers.getLastChild().getPreviousSibling();
             if (insertAfter != null) {
                 if (insertAfter.getPreviousSibling() != null && insertAfter.getPreviousSibling().getNodeType()
== Node.TEXT_NODE) {
                     String indent = insertAfter.getPreviousSibling().getTextContent();


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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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