Davis Walsh created LOG4J2-3612:
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Summary: Root LoggerConfig default for additivity changed in 2.17.2
Key: LOG4J2-3612
URL: https://issues.apache.org/jira/browse/LOG4J2-3612
Project: Log4j 2
Issue Type: Bug
Components: Core
Affects Versions: 2.17.2, 2.18.0
Reporter: Davis Walsh
Fix For: 2.17.3, 2.18.1
Before 2.17.2 the default additivity for LoggerConfig was
[true|https://github.com/apache/logging-log4j2/blob/release-2.x/log4j-core/src/main/java/org/apache/logging/log4j/core/config/LoggerConfig.java#L747],
but is now
[false|https://github.com/apache/logging-log4j2/blob/release-2.x/log4j-core/src/main/java/org/apache/logging/log4j/core/config/LoggerConfig.java#L122].
I think this change was included in [this LOG4J2-3341
commit|https://github.com/apache/logging-log4j2/commit/5a459dda1e731dfa93198db63493c1cb1cd1e941#diff-461d467ccfa2fc222a0481d1c318f1f12e57dd60fb17ef2411c66f133f37fadf]
This has the effect of setting the root LoggerConfig's additivity to false.
While this may not have any impact on the root loggers functionality, it does
have an impact when new Loggers create created that were previously defaulting
to the root config. For example, when adding an Appender to such a logger, the
root config is used as the basis for the new LoggerConfig, [including this
affinity|https://github.com/apache/logging-log4j2/blob/release-2.x/log4j-core/src/main/java/org/apache/logging/log4j/core/config/AbstractConfiguration.java#L880].
This means that a Logger that previously logged to the root logger's appenders
will now only log to the newly added Appender.
I've been able to work around this by setting the level on the logger before
adding a new appender, which [hardcodes additivity to true in the new
LoggerConfig|https://github.com/apache/logging-log4j2/blob/release-2.x/log4j-core/src/main/java/org/apache/logging/log4j/core/config/Configurator.java#L422].
This seems fragile, especially [given the TODO statement in the
code|https://github.com/apache/logging-log4j2/blob/release-2.x/log4j-core/src/main/java/org/apache/logging/log4j/core/config/Configurator.java#L421].
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