[LOG4J2-3530] Async Logger Not Work

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.17.2
• Component/s: Core

Environment

maven dependencies

<dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.25</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.17.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.17.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j-impl</artifactId>
            <version>2.17.2</version>
        </dependency>
        <dependency>
            <groupId>com.lmax</groupId>
            <artifactId>disruptor</artifactId>
            <version>3.4.1</version>
        </dependency>

 

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
 
<!-- No need to set system property "log4j2.contextSelector" to any value
     when using <asyncLogger> or <asyncRoot>. -->
 
<Configuration status="WARN">
  <Appenders>
    <!-- Async Loggers will auto-flush in batches, so switch off immediateFlush. -->
    <RandomAccessFile name="RandomAccessFile" fileName="asyncWithLocation.log"
              immediateFlush="false" append="false">
      <PatternLayout>
        <Pattern>%d %p %class{1.} [%t] %location %m %ex%n</Pattern>
      </PatternLayout>
    </RandomAccessFile>
  </Appenders>
  <Loggers>
    <!-- pattern layout actually uses location, so we need to include it -->
    <AsyncLogger name="com.foo.Bar" level="trace" includeLocation="true">
      <AppenderRef ref="RandomAccessFile"/>
    </AsyncLogger>
    <Root level="info" includeLocation="true">
      <AppenderRef ref="RandomAccessFile"/>
    </Root>
  </Loggers>
</Configuration>

 

Test Code

public class LogTest {

    public static void main(String[] args) throws Exception

{         Logger logger = LoggerFactory.getLogger("com.foo.Bar");         Field extendedLoggerField = Log4jLogger.class.getDeclaredField("logger");         extendedLoggerField.setAccessible(true);         Object o = extendedLoggerField.get(logger);         System.out.println(o.getClass().getName());     }

}

 

• Flags: Important

Language

Java

• Assignee: Unassigned
• Reporter: upshi
• Created: 07/Jun/22 06:16
• Updated: 07/Jun/22 06:19

Description

I want to use the async logger with Log4j2, but i find that follow the official document, i can not get a real async logger.

I read this doc: https://logging.apache.org/log4j/2.x/manual/async.html

In this part "Mixing Synchronous and Asynchronous Loggers", i copy the xml config and run a test, it shows that the "com.foo.Bar" is not an async logger. 

 

From the test, i think it shuold be "org.apache.logging.log4j.core.async.AsyncLogger", but it is "org.apache.logging.log4j.core.Logger".