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The documentation for log4j2 configuration provides a nice sample XML document equivalent to the default configuration:

<?xml version="1.0" encoding="UTF-8"?> <Configuration status="WARN"> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/> </Console> </Appenders> <Loggers> <Root level="error"> <AppenderRef ref="Console"/> </Root> </Loggers> </Configuration>

What would the equivalent file look like as (valid) YAML?

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❐ The YAML file

The equivalent YAML file ( log4j2.yaml ) looks like this:

Configuration: status: warn Appenders: Console: name: Console target: SYSTEM_OUT PatternLayout: Pattern: "%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" Loggers: Root: level: error AppenderRef: ref: Console

This file is automatically loaded (assuming that the file is in the classpath and having the required dependencies), as described in Automatic Configuration.

❐ Maven

If you are using Maven, the following dependencies are required:

<dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.1</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.1</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-yaml</artifactId> <version>2.5.0</version> </dependency>

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