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https://issues.apache.org/jira/browse/LOG4J2-441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040932#comment-14040932
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Scott Harrington commented on LOG4J2-441:
-----------------------------------------
Yes, that was surprising to me when I first rewrote my log4j 1.2 XML
configurations for use in log4j 2.0.
There are two main reasons a user will define a logger element: (a) to adjust
the level, or (b) to map to a different chain of appenders, i.e. with
additivity="false".
In log4j 1.2 it was common to omit a "level" (or "priority") element for case
(b).
In log4j 2.0 you now have to explicitly set the level on every Logger (rarely
is the "error" default the right guess - but that's a separate discussion).
I think this will become an FAQ/complaint, so if you add a section to
configuration.html that addresses the difference, then at least you can point
folks to that section when they ask.
If the root level truly needs to be parameterized, the docs could suggest a
Lookup such as this: {{<Logger name="com.foo.Bar"
level="$\{sys:myframework.root.logging.level\}">}}
> logger level configuration does not work correct
> ------------------------------------------------
>
> Key: LOG4J2-441
> URL: https://issues.apache.org/jira/browse/LOG4J2-441
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Reporter: Andreas Rytina
> Assignee: Ralph Goers
> Attachments: log4j2.xml.row1, log4j2.xml.row10, log4j2.xml.row11,
> log4j2.xml.row12, log4j2.xml.row13, log4j2.xml.row2, log4j2.xml.row3,
> log4j2.xml.row4, log4j2.xml.row5, log4j2.xml.row6, log4j2.xml.row7,
> log4j2.xml.row8, log4j2.xml.row9
>
>
> Configuring the loglevel in the logger does not work in combination with
> configuring the loglevel at the appender-refs. I analyzed this with the
> beta9. See the table which lists various loglevel configurations for the 3
> loggers. The column format for the table is:
> Column 1-6 are the logger with their level config (level@logger1,
> level@appender-ref)(level@logger2, level@appender-ref)(level@logger3,
> level@appender-ref)
> Column 7 is the actual output
> Column 8 is the expected Output
> For instance the first row of the table shows a logging result which I not
> expected in that way. You can take log4j2.xml.row1 to reproduce the first
> row. The first logger is named "com". The second logger is named
> "com.log4jtest" and the third logger is named "com.log4jtest.test". This
> looks like a bug in log4j 2.0:
> Logger1 considers the levels {info, debug, warning} but not the level trace.
> {color:red}What is the default level, if there is no level defined at the
> logger header and also not at the appender-ref?{color} Here it seems that the
> Logger1 has the level debug as default which is not clear for me. For me it
> would make sense if the default level is either OFF or ALL when there is no
> explicit level set. But either way there should be a clear rule for this. The
> other rows are showing similar inconsistent logging behaviour.
> |1|2|3|4|5|6|7|8|
> ||level 1 logger||level 1 appender-ref||level 2 logger||level 2
> appender-ref||level 3 logger ||level 3 appender-ref||actual output||expected
> output||
> |-|-|-|info|debug|debug|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger1: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger|Logger3: info logger
> Logger2: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger|
> |-|-|-|info|-|debug|no output|Logger3: info logger
> Logger2: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger|
> |-|-|info|info|-|debug|no output|Logger3: info logger
> Logger2: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger|
> |fatal|fatal|info|info|-|debug|no output|Logger3: info logger
> Logger2: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger|
> |info|info|info|info|-|debug|no output|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger|
> |debug|debug|info|info| |debug|no output|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger|
> |info|debug|info|info|-|debug|no output|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger|
> |debug|info|info|info|-|debug|no output|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger|
> |debug|trace|info|info|-|debug|no output|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger|
> |-|-|info|info|fatal|debug|no output|Logger2: info logger
> Logger2: warning logger|
> |-|-|info|info|trace|debug|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger1: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger
> Logger1: trace logger|Logger3: info logger
> Logger2: info logger
> Logger3: debug logger
> Logger2: warning logger|
> |-|-|-|info|trace|debug|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger1: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger
> Logger1: trace logger|Logger3: info logger
> Logger2: info logger
> Logger3: debug logger
> Logger2: warning logger|
> |-|-|info|-|trace|debug|Logger3: info logger
> Logger2: info logger
> Logger1: info logger
> Logger3: debug logger
> Logger1: debug logger
> Logger3: warning logger
> Logger2: warning logger
> Logger1: warning logger
> Logger1: trace logger|Logger3: info logger
> Logger2: info logger
> Logger3: debug logger
> Logger2: warning logger|
> Here is the log4j2.xml:
> {code:xml}
> <?xml version="1.0" encoding="UTF-8" ?>
> <configuration>
> <appenders>
> <console name="TestConsole0">
> <PatternLayout pattern="RootLogger: %msg%n"/>
> </console>
> <console name="TestConsole1">
> <PatternLayout pattern="Logger1: %msg%n"/>
> </console>
> <console name="TestConsole2">
> <PatternLayout pattern="Logger2: %msg%n"/>
> </console>
> <console name="TestConsole3">
> <PatternLayout pattern="Logger3: %msg%n"/>
> </console>
> </appenders>
>
> <loggers>
> <logger name="com" >
> <appender-ref ref="TestConsole1" />
> </logger>
>
> <logger name ="com.log4jtest" level="info">
> <appender-ref ref="TestConsole2" level="info"/>
> </logger>
>
> <logger name ="com.log4jtest.test" level="fatal">
> <appender-ref ref="TestConsole3" level="debug"/>
> </logger>
>
> <root level="error">
> <appender-ref ref="TestConsole0" level="error"/>
> </root>
> </loggers>
> </configuration>
> {code}
> And here are the logging calls:
> {code:title=Log4j2LogLevelTest.java|borderStyle=solid}
> package com.log4jtest.test;
> import static org.junit.Assert.*;
> import org.apache.logging.log4j.LogManager;
> import org.apache.logging.log4j.Logger;
> import org.junit.Test;
> public class Log4j2LogLevelTest {
> private static final Logger logger =
> LogManager.getLogger(Log4j2LogLevelTest.class);
>
> @Test
> public void testLogLevel() {
> logger.info("info logger");
> logger.debug("debug logger");
> logger.warn("warning logger");
> logger.trace("trace logger");
> }
> }
> {code}
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