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https://issues.apache.org/jira/browse/LOG4J2-219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13641332#comment-13641332
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Remko Popma commented on LOG4J2-219:
------------------------------------
Underlying cause: BaseConfiguration will not connect appenders to Loggers if no
root element is present.
Instead, if no root element is present, it will create a default root element
and connect it to a default Console appender.
A status logger warning is emitted: "No Root logger was configured, using
default".
Further processing is skipped and other configured logger elements are not
considered.
Logger elements will only be connected to their appenders if a root element
exists.
(see o.a.l.l.c.c.BaseConfiguration.doConfigure() from line 199)
I'm not sure what to do with this.
The code essentially says that a root element is mandatory.
The documentation does not say that anywhere (or did I miss something?).
True, all examples have a root element, but those are just examples...
Should we change the code or change the docs?
> Named logger without root logger ends up with empty Appenders map - does not
> log anything
> -----------------------------------------------------------------------------------------
>
> Key: LOG4J2-219
> URL: https://issues.apache.org/jira/browse/LOG4J2-219
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0-beta5
> Reporter: Remko Popma
>
> On the log4j-user mailing list, Peter DePasquale gave this test case that
> demonstrates the problem:
> Note that the configuration has no root logger, but only contains a named
> logger.
> In a debugger I found that the LoggerConfig for "logtest.LogTest" ended up
> with an empty "appenders" Map<String, AppenderControl<?>>. The appenderRefs
> list did contain an AppenderRef object but in #callAppenders there are no
> AppenderControl objects to call...
> (Sorry, I have been unable to find out the underlying cause yet.)
> <?xml version="1.0" encoding="UTF-8"?>
> <configuration status="warn">
> <appenders>
> <File name="tracelog" fileName="trace-log.txt"
> immediateFlush="true" append="false">
> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level
> %logger{36} - %msg%n"/>
> </File>
> </appenders>
>
> <loggers>
> <logger name="logtest.LogTest" level="trace">
> <appender-ref ref="tracelog"/>
> </logger>
> </loggers>
> </configuration>
> package logtest;
> import org.apache.logging.log4j.LogManager;
> import org.apache.logging.log4j.Logger;
> import org.apache.logging.log4j.core.config.XMLConfigurationFactory;
> public class LogTest {
> public static void main(String[] args) {
>
> System.setProperty(XMLConfigurationFactory.CONFIGURATION_FILE_PROPERTY,
> "log4j2-roottest.xml");
> Logger logger = LogManager.getLogger(LogTest.class);
> logger.trace("This is a trace message");
> logger.info("This is an info message");
> logger.warn("This is a warning message");
> }
> }
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