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https://issues.apache.org/jira/browse/LOG4J2-2355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16520481#comment-16520481
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ASF subversion and git services commented on LOG4J2-2355:
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Commit 9d459d4a606c4eddbb093fbfb955daf68d099c40 in logging-log4j2's branch
refs/heads/release-2.x from [~ckozak]
[ https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;h=9d459d4 ]
[LOG4J2-2355] Add testing and changelog entry
Remvoes logging to stderr when PropertiesUtil is presented with
a null key or value. This may occur in normal usage when keys are
removed from the properties map.
> PropertiesUtil.reload() might throw NullPointerException
> --------------------------------------------------------
>
> Key: LOG4J2-2355
> URL: https://issues.apache.org/jira/browse/LOG4J2-2355
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Affects Versions: 2.11.0
> Reporter: Henrik
> Priority: Major
>
> SystemPropertiesPropertySource.forEach(..) uses Property.getProperty(..)
> to resolve values. If that value is a non-String, the value will be
> null. Since {{literal}} is a ConcurrentHashMap, a put(..) with null value
> will yield a NullPointerException.
> This is especially hard to debug in the case of e.g. StatusLogger,
> which initializes PropertiesUtil as a static variable. The class is
> unable to load, throws a NoClassDefFoundError, and hides the
> NullPointerException.
> Here's what I got when I had a Property value that was a File:
> Caused by: java.lang.NoClassDefFoundError: Could not initialize class
> org.apache.logging.log4j.util.PropertiesUtil
> at org.apache.logging.log4j.status.StatusLogger.(StatusLogger.java:78)
> at org.apache.logging.log4j.LogManager.(LogManager.java:60)
>
> PR: https://github.com/apache/logging-log4j2/pull/183
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