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    <p><strong>Log4J MDC approach</strong></p> <p>This is how to do it with MDC</p> <pre><code>public class MdcExample implements Runnable { private static final Logger logger = Logger.getLogger(MdcExample.class); public static void main(final String[] args) { final MdcExample threadLocalExample = new MdcExample(); final Thread thread1 = new Thread(threadLocalExample); final Thread thread2 = new Thread(threadLocalExample); final Thread thread3 = new Thread(threadLocalExample); thread1.start(); thread2.start(); thread3.start(); } @Override public void run() { while (true) { MDC.put("random", "" + Math.random()); try { logger.info("My log message, prefixed with MDC"); TimeUnit.SECONDS.sleep(1); } catch (final InterruptedException e) { } } } } </code></pre> <p>Log4J settings:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd"&gt; &lt;log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"&gt; &lt;!-- Appenders --&gt; &lt;appender name="console" class="org.apache.log4j.ConsoleAppender"&gt; &lt;param name="Target" value="System.out" /&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%-5p %X{random}:- %m%n" /&gt; &lt;/layout&gt; &lt;/appender&gt; &lt;!-- Root Logger --&gt; &lt;root&gt; &lt;priority value="info" /&gt; &lt;appender-ref ref="console" /&gt; &lt;appender-ref ref="file" /&gt; &lt;/root&gt; &lt;/log4j:configuration&gt; </code></pre> <p><strong>Thread Local approach (if your Businesslogic requires it)</strong></p> <p>If you like to store values (like users) locally to a thread, then use <code>ThreadLocal</code>:</p> <pre><code>import java.util.concurrent.TimeUnit; public class ThreadLocalExample implements Runnable { ThreadLocal&lt;Double&gt; myRandom = new ThreadLocal&lt;&gt;(); public static void main(final String[] args) { final ThreadLocalExample threadLocalExample = new ThreadLocalExample(); final Thread thread1 = new Thread(threadLocalExample); final Thread thread2 = new Thread(threadLocalExample); final Thread thread3 = new Thread(threadLocalExample); thread1.start(); thread2.start(); thread3.start(); } @Override public void run() { this.myRandom.set(Math.random()); while (true) { System.out.println(Thread.currentThread().getId() + " " + this.myRandom.get()); try { TimeUnit.SECONDS.sleep(1); } catch (final InterruptedException e) { } } } } </code></pre> <p><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/ThreadLocal.html" rel="nofollow">http://docs.oracle.com/javase/6/docs/api/java/lang/ThreadLocal.html</a></p> <p><strong>Adding the Thread ID to log4j output</strong></p> <p>Regarding your log4j question, you can use th <code>t</code>-Placeholder for the Thread name:</p> <p>This is an example Appender you can use:</p> <pre><code>&lt;appender name="console" class="org.apache.log4j.ConsoleAppender"&gt; &lt;param name="Target" value="System.out" /&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%5p %d{ISO8601} [%t][%x] %c - %m%n" /&gt; &lt;/layout&gt; &lt;/appender&gt; </code></pre> <p><a href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html" rel="nofollow">http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html</a></p>
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    1. POIn java, is it possible to save a variable, local to a thread?
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    1. CO+1 no idea why there are downvotes
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    2. CO@user187809 Do you need smth. else?
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