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BAEL-5124 - Adding a module with examples of printing thread info in the log file using log4j (#11704)
* adding a example module for printing thread info in log file using log4j * - fix: removing submodule * - fix: Adding submodule * - fix: Removing `.gitignore`, `README.md`, and `application.properties`. - fix: Removing Spring boot and adding log4j2 from Maven Central * - fix: Changing module name as suggested to log4j2-thread-info. - fix: Fixing log path in log4j2 configuration * - feat: Removing log4j2-thread-info module - feat: Adding example code into existing log4j2 module * - fix: Removing unnecessary logging * - fix: Separating thread info in the logging pattern * - fix: package name to lowercase * lowercasing package name and variable name * changing package name in configuration * - fix: formatting * - fix: formatting imports
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‎logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2threadinfo/Log4j2ThreadInfo.java‎

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package com.baeldung.logging.log4j2threadinfo;
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import java.util.stream.IntStream;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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public class Log4j2ThreadInfo {
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private static final Logger logger = LogManager.getLogger(Log4j2ThreadInfo.class);
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public static void main(String[] args) {
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IntStream.range(0, 5).forEach(i -> {
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Runnable runnable = () -> logger.info("Logging info");
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Thread thread = new Thread(runnable);
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thread.start();
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});
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}
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}

‎logging-modules/log4j2/src/main/resources/log4j2.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<Configuration>
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<Properties>
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<Property name="LOG_PATTERN">
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%d{yyyy-MM-dd HH:mm:ss.SSS} --- thread_id="%tid" thread_name="%tn" thread_priority="%tp" --- [%p] %m%n
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</Property>
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</Properties>
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<Appenders>
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<RollingFile name="RollingName" filename="logs/app.log"
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filePattern="$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log">
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<PatternLayout>
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<Pattern>${LOG_PATTERN}</Pattern>
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</PatternLayout>
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<Policies>
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<SizeBasedTriggeringPolicy size="20MB"/>
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</Policies>
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</RollingFile>
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<Console name="Console" target="SYSTEM_OUT">
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<PatternLayout pattern="${LOG_PATTERN}"/>
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</Console>
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</Appenders>
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<Loggers>
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<Logger name="com.baeldung.logging.log4j2threadinfo" level="trace">
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<AppenderRef ref="Console"/>
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</Logger>
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<Root level="error">
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<AppenderRef ref="RollingName"/>
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</Root>
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</Loggers>
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</Configuration>

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