Logback: set logback.xml programmatically using JoranConfigurator

Below snippet is used to read the logback.xml file from custom location.

LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
loggerContext.reset();

JoranConfigurator joranConfigurator = new JoranConfigurator();

try (InputStream inputStream = new FileInputStream("/Users/Shared/logback/logback.xml")) {
	joranConfigurator.setContext(loggerContext);
	joranConfigurator.doConfigure(inputStream);
}

 

Find the below working application.

 

Step 1: Create new maven project ‘customize-logback-loc-via-joran’.

 

Step 2: Update pom.xml with maven dependencies.

 

pom.xml

 

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.sample.app</groupId>
	<artifactId>customize-logback-loc-via-joran</artifactId>
	<version>1</version>

	<properties>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
	</properties>

	<dependencies>

		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.2.10</version>
		</dependency>


		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-core</artifactId>
			<version>1.2.10</version>
		</dependency>

		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.7.36</version>
		</dependency>


	</dependencies>
</project>

 

Step 3: Create logbac.xml file under /Users/Shared/logback folder.

 

logback.xml

<configuration>

	<appender name="STDOUT"
		class="ch.qos.logback.core.ConsoleAppender">
		<encoder>
			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
		</encoder>
	</appender>

	<root level="WARN">
		<appender-ref ref="STDOUT" />
	</root>
</configuration>

Step 4: Define HelloWorld class.

 

HelloWorld.java

package com.sample.app;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.joran.JoranConfigurator;
import ch.qos.logback.core.joran.spi.JoranException;

public class HelloWorld {
	private static Logger logger = LoggerFactory.getLogger(HelloWorld.class);

	public static void main(String[] args) throws JoranException, IOException {

		LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
		loggerContext.reset();

		JoranConfigurator joranConfigurator = new JoranConfigurator();

		try (InputStream inputStream = new FileInputStream("/Users/Shared/logback/logback.xml")) {
			joranConfigurator.setContext(loggerContext);
			joranConfigurator.doConfigure(inputStream);
		}

		logger.trace("Trace message");
		logger.debug("Debug message");
		logger.info("Info message");
		logger.warn("Warning message");
		logger.error("Error message");

	}
}

 

Total project structure looks like below.

Run HelloWorld.java class, you will see below messages in the console.

11:07:30.776 [main] WARN  com.sample.app.HelloWorld - Warning message
11:07:30.779 [main] ERROR com.sample.app.HelloWorld - Error message

 

You can download complete working application from below link.

https://github.com/harikrishna553/java-libs/tree/master/logback/customize-logback-loc-via-joran

 

 

 

 

 

 

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