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https://issues.apache.org/jira/browse/QPID-2051?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aidan Skinner resolved QPID-2051.
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Resolution: Fixed
> ensure the expected log4j configuration is used, and check the validity of
> the Log4J XML configuration file before applying it
> ------------------------------------------------------------------------------------------------------------------------------
>
> Key: QPID-2051
> URL: https://issues.apache.org/jira/browse/QPID-2051
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker
> Affects Versions: M2.1, M3, M4, 0.5
> Reporter: Robbie Gemmell
> Assignee: Aidan Skinner
> Fix For: 0.6
>
>
> The various jars within the Qpid project contain log4.xml and
> log4j.properties files. The default initialisation procedures of Log4J can
> pick these up depending on which jars are in the Classpath and apply one of
> them before the main broker configuration process is undertaken
> programmaticaly in the Main class, which leads to a mixed configuration. This
> should be prevented to ensure only the etc/log4j.xml (or other command-line
> specified file) is the only configuration applied.
> The Log4J configuration process proceeds even in the face of malformed XML,
> or invalid configuration details within valid XML content. The configuration
> process outputs warnings for malformed XML but does not halt, completing
> whatever it can but leaving the logging in an uncertain configuration. If an
> invalid logger level is found, Log4J just silently defaults the Logger (and
> any inheriting descendants) to DEBUG level.
> The broker should validate the XML before applying it, and check that any
> logger levels are valid Log4J levels before allowing a configuration to be
> applied. At startup, an invalid XML configuration should resulti in the
> broker failing to startup. After startup, this should prevent the new
> configuration being loaded (eg by the XML WatchDog or manually via JMX) over
> the existing configuration.
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