Logback: print internal status data to console

Below snippet print internal status data to console.

LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
StatusPrinter.print(loggerContext);

 

Find the complete working application.

 

Step 1: Create new maven project ‘logback-print-internal-status’.

 

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>logback-print-internal-status</artifactId>
	<version>1</version>

	<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 logback.xml file in src/main/resources folder.

 

logback.xml

<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <!-- encoders are assigned the type
         ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
    <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 application.

 

HelloWorld.java

package com.sample.app;

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

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.util.StatusPrinter;

public class HelloWorld {

  public static void main(String[] args) {

    Logger logger = LoggerFactory.getLogger(HelloWorld.class);
    logger.trace("Trace message");
    logger.debug("Debug message");
    logger.info("Info message");
    logger.warn("Warning message");
    logger.error("Error message");

    LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
    StatusPrinter.print(loggerContext);

  }
}

 

Total project structure looks like below.

 

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

10:31:53.139 [main] WARN  com.sample.app.HelloWorld - Warning message
10:31:53.144 [main] ERROR com.sample.app.HelloWorld - Error message
10:31:52,935 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
10:31:52,935 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/Users/krishna/Documents/metacat/logback-print-internal-status/target/classes/logback.xml]
10:31:53,024 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
10:31:53,025 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
10:31:53,036 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT]
10:31:53,048 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
10:31:53,132 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to WARN
10:31:53,132 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT]
10:31:53,133 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
10:31:53,135 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@2fd6b6c7 - Registering current configuration as safe fallback point

 

You can download complete working application from below link.

https://github.com/harikrishna553/java-libs/tree/master/logback/logback-print-internal-status

 

 

 

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