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Overview">RocketMQ Connect</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/4.x/contributionGuide/01how-to-contribute">Contribution Guide</a></div></li></ul></nav></div></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Best Practice</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Logging Confituration</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 4.x</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Logging Confituration</h1><p>Client logs are used to record exceptions that occur during the client's operation, helping to quickly locate and fix problems. This article introduces the way to print RocketMQ client logs and the default and custom configurations.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="printing-client-log">Printing Client Log<a href="#printing-client-log" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>RocketMQ's TCP Java SDK is programmed using the SLF4J interface.</p><ul><li>For Java SDK version 1.7.8.Final and above</li></ul><p>RocketMQ's Java SDK version 1.7.8.Final already has built-in log implementation and no log implementation dependency needs to be added in the client application to print RocketMQ client logs. For more information on default configuration and how to change it, refer to the client log configuration section below.</p><ul><li>For Java SDK version 1.7.8.Final and below</li></ul><p>Older versions of RocketMQ's Java SDK prior to version 1.7.8.Final do not support log4j2 and only support log4j and logback. You will need to add the corresponding log implementation dependency in the pom.xml configuration file or in the lib to print RocketMQ client logs.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="1-depend-on-log4j-as-the-log-implementation">1: Depend on log4j as the log implementation<a href="#1-depend-on-log4j-as-the-log-implementation" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><p>Example code for depending on log4j or logback as the log implementation is shown below.</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">org.slf4j</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">jcl-over-slf4j</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">1.7.7</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">org.slf4j</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">slf4j-log4j12</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">1.7.7</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">log4j</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">log4j</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">1.2.17</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>When using log4j property configuration file, configure it as follows.</p><div class="language-properties codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-properties codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">log4j.appender.mq=org.apache.rocketmq.logappender.log4j.RocketmqLog4jAppender </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">log4j.appender.mq.Tag=yourTag </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">log4j.appender.mq.Topic=yourLogTopic </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">log4j.appender.mq.ProducerGroup=yourLogGroup </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">log4j.appender.mq.NameServerAddress=yourRocketmqNameserverAddress </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">log4j.appender.mq.layout=org.apache.log4j.PatternLayout </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">log4j.appender.mq.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-4r [%t] (%F:%L) %-5p - %m%n </span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>When using log4j xml configuration file, configure it as such and add an asynchronous appender:</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">appender</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">mqAppender1</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">class</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">org.apache.rocketmq.logappender.log4j.RocketmqLog4jAppender</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">param</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">Tag</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">value</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">yourTag</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">param</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">Topic</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">value</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">yourLogTopic</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">param</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">ProducerGroup</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">value</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">yourLogGroup</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">param</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">NameServerAddress</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">value</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">yourRocketmqNameserverAddress</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">layout</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">class</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">org.apache.log4j.PatternLayout</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">param</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">ConversionPattern</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">value</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">%d{yyyy-MM-dd HH:mm:ss}-%p %t %c - %m%n</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">layout</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">appender</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">appender</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">mqAsyncAppender1</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">class</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">org.apache.log4j.AsyncAppender</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">param</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">BufferSize</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">value</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">1024</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">param</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">Blocking</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">value</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">false</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">appender-ref</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">ref</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">mqAppender1</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">appender</span><span class="token tag punctuation" style="color:#393A34">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>When using log4j2, configure it as this. If you want noneblock, simply configure a asyncAppender for ref.</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">RocketMQ</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">name</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">rocketmqAppender</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">producerGroup</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">yourLogGroup</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">nameServerAddress</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">yourRocketmqNameserverAddress</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"></span><br></span><span class="token-line" style="color:#393A34"><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">topic</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">yourLogTopic</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">tag</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">yourTag</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">PatternLayout</span><span class="token tag" style="color:#00009f"> </span><span class="token tag attr-name" style="color:#00a4db">pattern</span><span class="token tag attr-value punctuation attr-equals" style="color:#393A34">=</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag attr-value" style="color:#e3116c">%d [%p] hahahah %c %m%n</span><span class="token tag attr-value punctuation" style="color:#393A34">"</span><span class="token tag punctuation" style="color:#393A34">/></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">RocketMQ</span><span class="token tag punctuation" style="color:#393A34">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="2-depend-on-logback-as-the-log-implementation">2: Depend on logback as the log implementation<a href="#2-depend-on-logback-as-the-log-implementation" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">ch.qos.logback</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">logback-core</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">1.1.2</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">ch.qos.logback</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">logback-classic</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">1.1.2</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">ch.qos.logback</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">logback-core</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">1.1.2</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">ch.qos.logback</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">groupId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">logback-classic</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">artifactId</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#393A34"><</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain">1.1.2</span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">version</span><span class="token tag punctuation" style="color:#393A34">></span><span class="token plain"> </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token tag punctuation" style="color:#393A34"></</span><span class="token tag" style="color:#00009f">dependency</span><span class="token tag punctuation" style="color:#393A34">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><div class="theme-admonition theme-admonition-tip alert alert--success admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_S0QG"><p>Having both log4j and logback log implementations in the application will cause log conflicts and result in confusion in client log printing. Make sure the application only depends on one log implementation, which is the prerequisite for correctly printing RocketMQ client logs. It is recommended to check this using the command <strong><code>mvn clean dependency:tree | grep log</code></strong>.</p></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="client-log-configuration">Client log configuration<a href="#client-log-configuration" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>The RocketMQ client supports customizing the log save path, log level, and maximum number of historical log files to save. To ensure convenience in log transfer and reading, customizing the size of a single log file is currently not allowed and remains at the default of 64 MB. The configuration instructions for each parameter are as follows:</p><table><thead><tr><th>Parameter</th><th>Explain</th><th>Configuration parameter</th><th>Custom value</th></tr></thead><tbody><tr><td>Log save path</td><td>Please make sure that the application process has write permission to the specified path, otherwise the log will not be printed.</td><td>rocketmq.client.logRoot</td><td>You can customize the path where you want to save the log files locally. Please make sure that your application process has write permission to that path, otherwise the log will not be printed.</td></tr><tr><td>Maximum number of historical log files to save</td><td>The supported value range is between 1 to 100; if the input value is outside of this range or in the wrong format, the system will default to saving 10 logs.</td><td>rocketmq.client.logFileMaxIndex</td><td>The value range is 1~100. If the value set is out of range or in the wrong format, the default value (10) will be used.</td></tr><tr><td>Log level</td><td>The supported log levels are ERROR, WARN, INFO, DEBUG, if no match is found the default is INFO.</td><td>rocketmq.client.logLevel</td><td>Values：<strong>ERROR WARN INFO DEBUG</strong></td></tr><tr><td>Size of a single log file</td><td>Support specifying in bytes</td><td>rocketmq.client.logFileMaxSize</td><td>The value range is 0~1GB, the default is 1GB, it is recommended to use 64 MB</td></tr><tr><td>Whether to use parent logger to print logback</td><td>Whether children-logger use the appender configured by rootLogger for output</td><td>rocketmq.client.log.additive</td><td>true/false</td></tr><tr><td>Use the project's slf4j implementation to record logs</td><td>If need to implement log recording, set it to true</td><td>rocketmq.client.logUseSlf4j</td><td>true/flase</td></tr></tbody></table><h2 class="anchor anchorWithStickyNavbar_LWe7" id="default-configuration">Default configuration<a href="#default-configuration" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>Please make sure that the application process has write permission to the specified path, otherwise the log will not be printed. The supported value range is between 1 to 100; if the input value is outside of this range or in the wrong format, the system will default to saving 10 logs. The supported log levels are ERROR, WARN, INFO, DEBUG, if no match is found the default is INFO.</p><p>When the RocketMQ client starts, log files will be generated according to the following default configuration:</p><ul><li>Log save path: <code>/{user.home}/logs/rocketmqlogs/</code>, where <code>{user.home}</code> refers to the root directory of the user who starts the current Java process</li><li>Maximum number of historical log files to save: 10</li><li>Log level: INFO</li><li>Size of a single log file: 1GB </li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="custom-configuration">Custom configuration<a href="#custom-configuration" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>If need to customize the configuration, refer to the static variable definition of ClientLogger, and the parameter meaning aligns with the client configuration above.</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String CLIENT_LOG_USESLF4J = "rocketmq.client.logUseSlf4j";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String CLIENT_LOG_ROOT = "rocketmq.client.logRoot";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String CLIENT_LOG_MAXINDEX = "rocketmq.client.logFileMaxIndex";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String CLIENT_LOG_FILESIZE = "rocketmq.client.logFileMaxSize";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String CLIENT_LOG_LEVEL = "rocketmq.client.logLevel";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String CLIENT_LOG_ADDITIVE = "rocketmq.client.log.additive";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String CLIENT_LOG_FILENAME = "rocketmq.client.logFileName";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String CLIENT_LOG_ASYNC_QUEUESIZE = "rocketmq.client.logAsyncQueueSize";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static final String ROCKETMQ_CLIENT_APPENDER_NAME = "RocketmqClientAppender";</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> private static final InternalLogger CLIENT_LOGGER;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> private static final boolean CLIENT_USE_SLF4J;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> //private static Appender rocketmqClientAppender = null;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> static {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> CLIENT_USE_SLF4J = Boolean.parseBoolean(System.getProperty(CLIENT_LOG_USESLF4J, "false"));</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> if (!CLIENT_USE_SLF4J) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> InternalLoggerFactory.setCurrentLoggerType(InnerLoggerFactory.LOGGER_INNER);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> CLIENT_LOGGER = createLogger(LoggerName.CLIENT_LOGGER_NAME);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> createLogger(LoggerName.COMMON_LOGGER_NAME);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> createLogger(RemotingHelper.ROCKETMQ_REMOTING);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> } else {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> CLIENT_LOGGER = InternalLoggerFactory.getLogger(LoggerName.CLIENT_LOGGER_NAME);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> }</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="example">Example<a href="#example" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>Below is a simple example</p><p>Add the following system parameters in the startup script or IDE's VM options:</p><div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">Linux Example</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">windows Example</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">-Drocketmq.client.logRoot=/home/admin/logs -Drocketmq.client.logLevel=WARN -Drocketmq.client.logFileMaxIndex=20 -Drocketmq.client.logFileMaxSize=67108864</span><br></span></code></pre><div 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plain">-Drocketmq.client.logRoot=D:\logs -Drocketmq.client.logLevel=WARN -Drocketmq.client.logFileMaxIndex=20 -Drocketmq.client.logFileMaxSize=67108864</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a 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