Log4j does literally nothing?-CodePudding

My configuration file is path of the class path. At least I thought it is. I placed the log4j.properties file in the resources folder and log4j does nothing with it. Even if I delete it, no error occurs.

As anyone can see I'm using maven

Content of LoggerTest:

package com.dersimi.stella.logger;

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

public class LoggerTest {
    public static void main(String[] args) {
        System.out.println("xxx");
        Logger logger = LogManager.getLogger(LoggerTest.class);
        logger.info("Hello this is an info message");
        System.out.println("xxx");
    }
}

Program output:

xxx


xxx

Content of log4j.properties:

log4j.rootLogger=INFO, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=INFO
log4j.appender.console.Target=System.out
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.conversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p - %m%n

In pom.xml is nothing out of the ordinary, just the dependency org.apache.logging.log4j log4j-core 2.17.2, compiler source target is 16, no plugins

CodePudding user response：

The main problem is that you are trying to use log4j (the first one) configurations for log4j2.

In first place make sure you have the following dependencies:

<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-core</artifactId>
  <version>2.17.0</version>
</dependency>
<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-api</artifactId>
  <version>2.17.0</version>
</dependency>

Second, have a file named log4j2.properties with a content like this:

status = warn

appender.console.type = Console
appender.console.name = LogToConsole
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n

rootLogger.level = info
rootLogger.appenderRef.stdout.ref = LogToConsole

Reference: https://mkyong.com/logging/log4j2-properties-example/