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My Google foo is letting me down today! I am trying to configure log4j2 so that I can access the loggers via JMX and change their log levels.

However, when I hook everything up, none of the loggers show up in the JMX tree (or log4j-jmx-gui) as shown in the log4j2 JMX docs. Only the log4j2 ContextSelector and StatusLogger in the JConsole attribute tree and the StatusLogger tab in the log4j-jmx-gui (stand-alone or as a plugin) show up. No LoggerContext elements.

I've googled and not come up with anything! That probably means I'm missing something somewhere. Any help would be greatly appreciated by me and wall which I'm banging my head against :)

I'm using Log4j2 beta9 with Java 1.6.0_45-b06 on win7. I have tried it on Java 7 and it results in the same behaviour.

The log4j2 dependencies being used:

log4j-api-2.0-beta9.jar
log4j-core-2.0-beta9.jar

My log4j2.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<Configuration  status="debug">
    <Appenders>
        <Console name="log-test" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{DATE} %-5p LJX2 %c{1}: %m%n" />
        </Console>
    </Appenders>
    <Loggers>
        <Logger name="top.Log4J2TestApp" level="debug"  additivity="false">
            <AppenderRef ref="log-test" />
        </Logger>
        <Root level="trace">
            <AppenderRef ref="log-test" />
        </Root>
    </Loggers>
</Configuration>

My test program:

package top;   
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class Log4J2TestApp { 
    public static void main(String[] args) {
        System.out.println("******** Started ZZZ ****************");
        Logger log = LogManager.getLogger(Log4J2TestApp.class);
        int cnt = 0;
        while (true) {
            log.warn("=========== Test message: {} ================", cnt++);
            Thread.sleep(1000);
        }
    }
}

The output of the test program looks like this: 

******** Started ZZZ ****************
2013-11-06 15:07:29,720 DEBUG Generated plugins in 0.000020959 seconds
2013-11-06 15:07:29,733 DEBUG Calling createLayout on class org.apache.logging.log4j.core.layout.PatternLayout for element PatternLayout with params(pattern="%d{DATE} %-5p LJX2 %c{1}: %m%n", Configuration(log4j2.xml), null, charset="null",alwaysWriteExceptions="null")
2013-11-06 15:07:29,735 DEBUG Generated plugins in 0.000013687 seconds
2013-11-06 15:07:29,737 DEBUG Calling createAppender on class org.apache.logging.log4j.core.appender.ConsoleAppender for element Console with params(PatternLayout(%d{DATE} %-5p LJX2 %c{1}: %m%n), null, target="SYSTEM_OUT", name="log-test",follow="null", ignoreExceptions="null")
2013-11-06 15:07:29,739 DEBUG Jansi is not installed, cannot find org.fusesource.jansi.WindowsAnsiOutputStream2013-11-06 15:07:29,740 DEBUG Calling createAppenders on class org.apache.logging.log4j.core.config.plugins.AppendersPlugin for element Appenders with params(Appenders={log-test})
2013-11-06 15:07:29,742 DEBUG Generated plugins in 0.000012832 seconds
2013-11-06 15:07:29,743 DEBUG Calling createAppenderRef on class org.apache.logging.log4j.core.config.AppenderRef for element AppenderRef with params(ref="log-test", level="null", null)
2013-11-06 15:07:29,746 DEBUG Calling createLogger on class org.apache.logging.log4j.core.config.LoggerConfig for element Logger with params(additivity="false", level="debug", name="top.Log4J2TestApp", includeLocation="null", AppenderRef={log-test}, Properties={}, Configuration(log4j2.xml), null)
2013-11-06 15:07:29,749 DEBUG Calling createAppenderRef on class org.apache.logging.log4j.core.config.AppenderRef for element AppenderRef with params(ref="log-test", level="null", null)
2013-11-06 15:07:29,751 DEBUG Calling createLogger on class org.apache.logging.log4j.core.config.LoggerConfig$RootLogger for element Root with params(additivity="null", level="trace", includeLocation="null", AppenderRef={log-test}, Properties={}, Configuration(log4j2.xml), null)
2013-11-06 15:07:29,754 DEBUG Calling createLoggers on class org.apache.logging.log4j.core.config.plugins.LoggersPluginfor element Loggers with params(Loggers={top.Log4J2TestApp, root})
2013-11-06 15:07:29,755 DEBUG Reconfiguration completed
06 Nov 2013 15:07:29,763 WARN  LJX2 Log4J2TestApp: =========== Test message: 0 ================
....
06 Nov 2013 15:07:36,766 WARN  LJX2 Log4J2TestApp: =========== Test message: 7 ================

2013-11-06 15:07:51,450 DEBUG ServletContext not present - WebLookup not added
2013-11-06 15:07:51,451 DEBUG Shutting down OutputStreamManager SYSTEM_OUT

The StatusLogger tab in the log4j-jmx-gui does have one exception but it would seem to have nothing to do with the loggers.

2013-11-06 15:41:01,403 WARN Multiple logging implementations found: 
Factory: org.apache.logging.log4j.core.impl.Log4jContextFactory, Weighting: 10
Using factory: org.apache.logging.log4j.core.impl.Log4jContextFactory
2013-11-06 15:41:01,505 WARN JmDNS or serviceInfo class not found java.lang.ClassNotFoundException: javax.jmdns.JmDNS
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:171)
    at org.apache.logging.log4j.core.net.MulticastDNSAdvertiser.initializeJMDNS(MulticastDNSAdvertiser.java:228)
    at org.apache.logging.log4j.core.net.MulticastDNSAdvertiser.<clinit>(MulticastDNSAdvertiser.java:41)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:171)
    at org.apache.logging.log4j.core.config.plugins.PluginManager.decode(PluginManager.java:241)
    at org.apache.logging.log4j.core.config.plugins.PluginManager.collectPlugins(PluginManager.java:152)
    at org.apache.logging.log4j.core.config.plugins.PluginManager.collectPlugins(PluginManager.java:130)
    at org.apache.logging.log4j.core.pattern.PatternParser.<init>(PatternParser.java:116)
    at org.apache.logging.log4j.core.pattern.PatternParser.<init>(PatternParser.java:102)
    at org.apache.logging.log4j.core.layout.PatternLayout.createPatternParser(PatternLayout.java:183)
    at org.apache.logging.log4j.core.layout.PatternLayout.<init>(PatternLayout.java:115)
    at org.apache.logging.log4j.core.layout.PatternLayout.createLayout(PatternLayout.java:219)
    at org.apache.logging.log4j.core.config.DefaultConfiguration.<init>(DefaultConfiguration.java:51)
    at org.apache.logging.log4j.core.LoggerContext.<init>(LoggerContext.java:63)
    at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:217)
    at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:114)
    at org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:81)
    at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:83)
    at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:34)
    at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:387)
    at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:332)
    at top.Log4J2TestApp.main(Log4J2TestApp.java:10)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)

2013-11-06 15:41:01,612 DEBUG Generated plugins in 0.000017537 seconds
2013-11-06 15:41:01,625 DEBUG Calling createLayout on class org.apache.logging.log4j.core.layout.PatternLayout for element PatternLayout with params(pattern="%d{DATE} %-5p LJX2 %c{1}: %m%n", Configuration(log4j2.xml), null, charset="null", alwaysWriteExceptions="null")
2013-11-06 15:41:01,627 DEBUG Generated plugins in 0.000011977 seconds
2013-11-06 15:41:01,629 DEBUG Calling createAppender on class org.apache.logging.log4j.core.appender.ConsoleAppender for element Console with params(PatternLayout(%d{DATE} %-5p LJX2 %c{1}: %m%n), null, target="SYSTEM_OUT", name="log-test", follow="null", ignoreExceptions="null")
2013-11-06 15:41:01,631 DEBUG Jansi is not installed, cannot find org.fusesource.jansi.WindowsAnsiOutputStream
2013-11-06 15:41:01,632 DEBUG Calling createAppenders on class org.apache.logging.log4j.core.config.plugins.AppendersPlugin for element Appenders with params(Appenders={log-test})
2013-11-06 15:41:01,633 DEBUG Generated plugins in 0.000011977 seconds
2013-11-06 15:41:01,635 DEBUG Calling createAppenderRef on class org.apache.logging.log4j.core.config.AppenderRef for element AppenderRef with params(ref="log-test", level="null", null)
2013-11-06 15:41:01,637 DEBUG Calling createLogger on class org.apache.logging.log4j.core.config.LoggerConfig for element Logger with params(additivity="false", level="debug", name="top.Log4J2TestApp", includeLocation="null", AppenderRef={log-test}, Properties={}, Configuration(log4j2.xml), null)
2013-11-06 15:41:01,640 DEBUG Calling createAppenderRef on class org.apache.logging.log4j.core.config.AppenderRef for element AppenderRef with params(ref="log-test", level="null", null)
2013-11-06 15:41:01,642 DEBUG Calling createLogger on class org.apache.logging.log4j.core.config.LoggerConfig$RootLogger for element Root with params(additivity="null", level="trace", includeLocation="null", AppenderRef={log-test}, Properties={}, Configuration(log4j2.xml), null)
2013-11-06 15:41:01,644 DEBUG Calling createLoggers on class org.apache.logging.log4j.core.config.plugins.LoggersPlugin for element Loggers with params(Loggers={top.Log4J2TestApp, root})
2013-11-06 15:41:01,646 DEBUG Reconfiguration completed
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2 回答 2

1

您的配置看起来不错，唯一有点可疑的是错误。该错误似乎确实发生在 LoggerContext 构造函数中，因此它可能毕竟是相关的。

你可能发现了一个错误。您介意在 log4j2 问题跟踪器中报告此问题，以便 log4j 团队可以查看吗？

于 2013-11-06T22:22:53.140 回答
1

Log4j2 默认使用ClassLoaderContextSelectoras ContextSelector。在某些情况下（我不清楚，可能是像你这样的简单应用程序）它不返回任何getLoggerContexts()方法调用结果。没有记录器上下文 - 什么都没有显示，因此LoggerContext树中不存在类别。它可以通过选择另一个ContextSelector实现来修复。我用于org.apache.logging.log4j.core.selector.BasicContextSelector此目的。可以使用名为“Log4jContextSelector”的系统属性进行设置。有关更多信息，请参阅文档。

它解决了我的问题，我希望它也有助于解决你的问题。

于 2013-12-03T03:11:16.370 回答