log4j2

In log4j 1.2 to log4j 2 migration, what to do with the DailyRollingFileAppender class?

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You are looking for the RollingFile appender <RollingFile name=”DAILY_LOG” fileName=”log/daily.log” filePattern=”log/%d{ddMMyyyy}_daily.log” > <PatternLayout pattern=”%d [%7r] %5p – %c – %m%n”/> <Policies> <TimeBasedTriggeringPolicy interval=”1″/> </Policies> </RollingFile> The previous sample rolls over by day, the interval being 1 unit which is determined by the smallest unit of the date lookup in the file pattern. In other words … Read more

Difference between AsyncLogger and AsyncAppender in Log4j2

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True, they achieve pretty much the same purpose, so I can understand your question: “why have both options”? For background, the AsyncAppender has been in Log4j2 from the beginning, where Async Loggers were added in March last year (2014). That’s how the current situation came to be. The log4j team is not seriously considering removing … Read more

Log4j2 configuration not found when running standalone application built by shade plugin

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ok I found this issue about this problem. In short, the problem arises when application classes are packaged in uber jar using maven shade plugin. While for log4j2 version 2.8.1 the fix is still pending, the suggested workaround is to update maven pom.xml with extra configuration settings for shade plugin as follow: <project xmlns=”http://maven.apache.org/POM/4.0.0″ xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” … Read more

How to configure log4j 2.x purely programmatically?

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package com; import org.apache.logging.log4j.Level; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import org.apache.logging.log4j.core.Appender; import org.apache.logging.log4j.core.LoggerContext; import org.apache.logging.log4j.core.appender.ConsoleAppender; import org.apache.logging.log4j.core.config.AppenderRef; import org.apache.logging.log4j.core.config.Configuration; import org.apache.logging.log4j.core.config.LoggerConfig; import org.apache.logging.log4j.core.layout.PatternLayout; import java.nio.charset.Charset; public class MyLoggerTest { public static void main(String[] args){ LoggerContext context= (LoggerContext) LogManager.getContext(); Configuration config= context.getConfiguration(); PatternLayout layout= PatternLayout.createLayout(“%m%n”, null, null, Charset.defaultCharset(),false,false,null,null); Appender appender=ConsoleAppender.createAppender(layout, null, null, “CONSOLE_APPENDER”, null, null); appender.start(); AppenderRef … Read more

Mixing log4j 1.x and log4j 2

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Are you aware that log4j2 includes a bridge for log4j-1.2? You can use it by removing the old log4j-1.2.17.jar, and include these three jars: log4j-api-2.x.jar log4j-core-2.x.jar log4j-1.2-api-2.x.jar This will result in all calls that your application makes to the log4-1.2 API to be routed to the log4j2 implementation. The FAQ has a diagram that may … Read more

Time based triggering policy in log4j2

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1 here indicates 1 day and not 1 hour. I have manually tested with below configuration. <RollingFile name=”T” fileName=”/data_test/log/abc.log” filePattern=”/data_test/log/abc-%d{MM-dd-yyyy}-%i.log”> <PatternLayout> <Pattern>%d{ISO8601} %-5p [%t] (%F:%L) – %m%n</Pattern> </PatternLayout> <Policies> <TimeBasedTriggeringPolicy interval=”1″ modulate=”true”/> <SizeBasedTriggeringPolicy size=”100 KB” /> </Policies> </RollingFile> For manual testing, I change the system date and time. First, try with increasing 1 hour. The … Read more

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