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https://issues.apache.org/jira/browse/LOG4J2-219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13641491#comment-13641491
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Ralph Goers commented on LOG4J2-219:
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That is a good question.
1. Obviously the warning isn't noisy enough.
2. The concern I have on changing the code is that you would need to add a root
logger that either a) does nothing, which seems odd or b) writes to the
console, which may confuse users even more since they won't know why that is
happening.
I guess I'm inclined to lean towards creating a root appender that writes to
the console (essentially what is happening now) and then including the user's
configuration, while emitting a warning and making sure the documentation is
clear on this. At the same time it would be good to know what Log4j 1.x and
Logback do in this case.
Ralph
> 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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