| <div role="region" aria-label="Skip to main content"><a class="skipToContent_fXgn" href="#__docusaurus_skipToContent_fallback">Skip to main content</a></div><nav aria-label="Main" class="navbar navbar--fixed-top"><div class="navbar__inner"><div class="navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button><a class="navbar__brand" href="/"><div class="navbar__logo"><img src="/img/Apache_RocketMQ_logo.svg.png" alt="My Site Logo" class="themedImage_ToTc themedImage--light_HNdA"><img src="/img/Apache_RocketMQ_logo.svg.png" alt="My Site Logo" class="themedImage_ToTc themedImage--dark_i4oU"></div><b class="navbar__title text--truncate">Apache RocketMQ</b></a></div><div class="navbar__items navbar__items--right"><a href="https://github.com/apache/rocketmq" target="_blank" rel="noopener noreferrer" class="navbar__item navbar__link">GitHub<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a><div class="navbar__item dropdown dropdown--hoverable dropdown--right"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link"><svg viewBox="0 0 24 24" width="20" height="20" aria-hidden="true" class="iconLanguage_nlXk"><path fill="currentColor" d="M12.87 15.07l-2.54-2.51.03-.03c1.74-1.94 2.98-4.17 3.71-6.53H17V4h-7V2H8v2H1v1.99h11.17C11.5 7.92 10.44 9.75 9 11.35 8.07 10.32 7.3 9.19 6.69 8h-2c.73 1.63 1.73 3.17 2.98 4.56l-5.09 5.02L4 19l5-5 3.11 3.11.76-2.04zM18.5 10h-2L12 22h2l1.12-3h4.75L21 22h2l-4.5-12zm-2.62 7l1.62-4.33L19.12 17h-3.24z"></path></svg>English</a><ul class="dropdown__menu"><li><a href="/zh/docs/4.x/producer/02message1" target="_self" rel="noopener noreferrer" class="dropdown__link" lang="zh">简体中文</a></li><li><a href="/docs/4.x/producer/02message1" target="_self" rel="noopener noreferrer" class="dropdown__link dropdown__link--active" lang="en">English</a></li></ul></div><div class="navbar__item dropdown dropdown--hoverable dropdown--right"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Docs</a><ul class="dropdown__menu"><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/docs/">5.0</a></li><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/docs/4.x/">4.x</a></li></ul></div><a class="navbar__item navbar__link" href="/download">Download</a><div class="navbar__item dropdown dropdown--hoverable dropdown--right"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Blog</a><ul class="dropdown__menu"><li><a class="dropdown__link" href="/blog">User Cases</a></li><li><a class="dropdown__link" href="/events">Activity</a></li><li><a class="dropdown__link" href="/release-notes">Change Log</a></li><li><a class="dropdown__link" href="/news">RocketMQ News</a></li></ul></div><div class="navbar__item dropdown dropdown--hoverable dropdown--right"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Community</a><ul class="dropdown__menu"><li><a class="dropdown__link" href="/contact">Join Community</a></li><li><a class="dropdown__link" href="/origin">Origin</a></li><li><a class="dropdown__link" href="/team">Teams</a></li><li><a class="dropdown__link" href="/docs/contributionGuide/01how-to-contribute">Contributions</a></li><li><a class="dropdown__link" href="/enterprise">Enterprises</a></li></ul></div><div class="toggle_vylO colorModeToggle_DEke"><button class="clean-btn toggleButton_gllP toggleButtonDisabled_aARS" type="button" disabled="" title="Switch between dark and light mode (currently light mode)" aria-label="Switch between dark and light mode (currently light mode)" aria-live="polite"><svg viewBox="0 0 24 24" width="24" height="24" class="lightToggleIcon_pyhR"><path fill="currentColor" d="M12,9c1.65,0,3,1.35,3,3s-1.35,3-3,3s-3-1.35-3-3S10.35,9,12,9 M12,7c-2.76,0-5,2.24-5,5s2.24,5,5,5s5-2.24,5-5 S14.76,7,12,7L12,7z M2,13l2,0c0.55,0,1-0.45,1-1s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S1.45,13,2,13z M20,13l2,0c0.55,0,1-0.45,1-1 s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S19.45,13,20,13z M11,2v2c0,0.55,0.45,1,1,1s1-0.45,1-1V2c0-0.55-0.45-1-1-1S11,1.45,11,2z M11,20v2c0,0.55,0.45,1,1,1s1-0.45,1-1v-2c0-0.55-0.45-1-1-1C11.45,19,11,19.45,11,20z M5.99,4.58c-0.39-0.39-1.03-0.39-1.41,0 c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0s0.39-1.03,0-1.41L5.99,4.58z M18.36,16.95 c-0.39-0.39-1.03-0.39-1.41,0c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0c0.39-0.39,0.39-1.03,0-1.41 L18.36,16.95z M19.42,5.99c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06c-0.39,0.39-0.39,1.03,0,1.41 s1.03,0.39,1.41,0L19.42,5.99z M7.05,18.36c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06 c-0.39,0.39-0.39,1.03,0,1.41s1.03,0.39,1.41,0L7.05,18.36z"></path></svg><svg viewBox="0 0 24 24" width="24" height="24" class="darkToggleIcon_wfgR"><path fill="currentColor" d="M9.37,5.51C9.19,6.15,9.1,6.82,9.1,7.5c0,4.08,3.32,7.4,7.4,7.4c0.68,0,1.35-0.09,1.99-0.27C17.45,17.19,14.93,19,12,19 c-3.86,0-7-3.14-7-7C5,9.07,6.81,6.55,9.37,5.51z M12,3c-4.97,0-9,4.03-9,9s4.03,9,9,9s9-4.03,9-9c0-0.46-0.04-0.92-0.1-1.36 c-0.98,1.37-2.58,2.26-4.4,2.26c-2.98,0-5.4-2.42-5.4-5.4c0-1.81,0.89-3.42,2.26-4.4C12.92,3.04,12.46,3,12,3L12,3z"></path></svg></button></div><div class="searchBox_ZlJk"><button type="button" class="DocSearch DocSearch-Button" aria-label="Search"><span class="DocSearch-Button-Container"><svg width="20" height="20" class="DocSearch-Search-Icon" viewBox="0 0 20 20" aria-hidden="true"><path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke="currentColor" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg><span class="DocSearch-Button-Placeholder">Search</span></span><span class="DocSearch-Button-Keys"></span></button></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="__docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper_z2l0 docsWrapper_BCFX"><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_sjWU" type="button"></button><div class="docPage__5DB"><aside class="theme-doc-sidebar-container docSidebarContainer_b6E3"><div class="sidebarViewport_Xe31"><div class="sidebar_njMd"><nav aria-label="Docs sidebar" class="menu thin-scrollbar menu_SIkG"><ul class="theme-doc-sidebar-menu menu__list"><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/">Introduction</a></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret menu__link--active" aria-expanded="true" href="/docs/4.x/producer/01concept1">Producer</a></div><ul style="display:block;overflow:visible;height:auto" class="menu__list"><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/4.x/producer/01concept1">Core Concept</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="/docs/4.x/producer/02message1">Simple Message Sending</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/4.x/producer/03message2">Ordered Message Sending</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/4.x/producer/04message3">Delayed Message Sending</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/4.x/producer/05message4">Batch Message Sending</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/docs/4.x/producer/06message5">Transactional Message Sending</a></li></ul></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/consumer/01concept2">Consumer</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/deployment/01deploy">Deployment & Operations</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/bestPractice/01bestpractice">Best Practice</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/parameterConfiguration/01local">Parameter Configuration</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/eventbridge/01RocketMQEventBridgeConcepts">RocketMQ EventBridge</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/mqtt/01RocketMQMQTTOverview">RocketMQ MQTT</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/streams/01RocketMQ Streams Overview">RocketMQ Streams</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/connect/01RocketMQ Connect 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">Producer</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">Simple Message Sending</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>Simple Message Sending</h1><h2 class="anchor anchorWithStickyNavbar_LWe7" id="1creating-topic-in-cluster">1.Creating Topic in Cluster<a href="#1creating-topic-in-cluster" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>RocketMQ cluster is enabled by default with <strong>autoCreateTopicEnable</strong> configuration, which will automatically create Topics for the sent messages. If autoCreateTopicEnable is not enabled, you can also use the RocketMQ Admin tool to create the target Topic.</p><div class="language-shell codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-shell codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">sh</span><span class="token plain"> bin/mqadmin updateTopic -c DefaultCluster -t TopicTest -n </span><span class="token number" style="color:#36acaa">127.0</span><span class="token plain">.0.1:9876</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">create topic to </span><span class="token number" style="color:#36acaa">127.0</span><span class="token plain">.0.1:10911 success.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">TopicConfig </span><span class="token punctuation" style="color:#393A34">[</span><span class="token plain">topicName</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">TopicTest, </span><span class="token assign-left variable" style="color:#36acaa">readQueueNums</span><span class="token operator" style="color:#393A34">=</span><span class="token number" style="color:#36acaa">8</span><span class="token plain">, </span><span class="token assign-left variable" style="color:#36acaa">writeQueueNums</span><span class="token operator" style="color:#393A34">=</span><span class="token number" style="color:#36acaa">8</span><span class="token plain">, </span><span class="token assign-left variable" style="color:#36acaa">perm</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">RW-, </span><span class="token assign-left variable" style="color:#36acaa">topicFilterType</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">SINGLE_TAG, </span><span class="token assign-left variable" style="color:#36acaa">topicSysFlag</span><span class="token operator" style="color:#393A34">=</span><span class="token number" style="color:#36acaa">0</span><span class="token plain">, </span><span class="token assign-left variable" style="color:#36acaa">order</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">false, </span><span class="token assign-left variable" style="color:#36acaa">attributes</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">null</span><span class="token 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>After executing the command above, 8 queues are created on the Broker machine with the Topic named TopicTest.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="2adding-client-side-dependency">2.Adding Client-Side Dependency<a href="#2adding-client-side-dependency" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>Firstly, add RocketMQ client-side dependency to JAVA application.</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">Maven</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Gradle</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><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"><dependency></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> <groupId>org.apache.rocketmq</groupId></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> <artifactId>rocketmq-client</artifactId></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> <version>4.9.4</version></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></dependency></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 role="tabpanel" class="tabItem_Ymn6" hidden=""><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">compile 'org.apache.rocketmq:rocketmq-client:4.9.4'</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><h2 class="anchor anchorWithStickyNavbar_LWe7" id="3message-sending">3.Message Sending<a href="#3message-sending" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h2><p>Apache RocketMQ sends messages in three ways: <strong>synchronous, asynchronous, and one-way</strong>. The first two message types are reliable since the response will be returned from the server regardless of whether their messages are successfully sent or not.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="31-synchronous-sending">3.1 Synchronous Sending<a href="#31-synchronous-sending" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><p>Synchronous Sending is a communication method in which the message sender sends a message and will send the next message only after receiving a synchronous response from the server. Reliable synchronous transmission is widely used in various scenarios, such as important notification messages, short message notifications, etc.</p><p><img loading="lazy" alt="同步发送" src="/assets/images/同步发送-6a8c78dae434afe4fbd970a2836f740c.png" width="900" height="939" class="img_ev3q"></p><p>The entire code for synchronous sending is as follows: </p><ol><li><strong>Create a Producer</strong>. Create a DefaultMQProducer in advance. The Producer should contain the name of the Producer group, which is a collection of Producer, they would send the same type of messages with identical logic.</li><li><strong>Set the address of NameServer</strong>. Apache RocketMQ is able to set the address of the NameServer (described in the client configuration) in many ways. The following example is set by calling the producer's setNamesrvAddr() method in the code, separated by a semicolon if there is more than one NameServer, such as "127.0.0.2:9876;127.0.0.3:9876".</li><li><strong>Build the message</strong>. Set the topic, tag, body, and so on. The tag can be understood as a label to categorize the message, and RocketMQ can filter the tag on the Consumer side.</li><li><strong>Call the send() method to send the message</strong>. Ultimately, the send() method will return a SendResult. The SendResult contains the actual send status including SEND_OK (send success), FLUSH_DISK_TIMEOUT (disk flush timeout), FLUSH_SLAVE_TIMEOUT (sync to slave timeout), SLAVE_NOT_AVAILABLE (slave can not be used), and an exception is thrown if it fails.</li></ol><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 class SyncProducer {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static void main(String[] args) throws Exception {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Initialize a producer and set the Producer group name</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name"); //（1）</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Set the address of NameServer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.setNamesrvAddr("localhost:9876"); //（2）</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Start Producer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.start();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> for (int i = 0; i < 100; i++) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Create a message and set the topic, tag, body and so on. The tag can be understood as a label to categorize the message, and RocketMQ can filter the tag on the consumer side.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> Message msg = new Message("TopicTest" /* Topic */,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> "TagA" /* Tag */,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ); //（3）</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Use the producer to send and wait for the result of sending synchronously</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> SendResult sendResult = producer.send(msg); //（4）</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> System.out.printf("%s%n", sendResult);</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"> // Close the producer once it is no longer in use</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.shutdown();</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><h3 class="anchor anchorWithStickyNavbar_LWe7" id="32-asynchronous-sending">3.2 Asynchronous Sending<a href="#32-asynchronous-sending" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><p><img loading="lazy" alt="异步发送" src="/assets/images/异步发送-c05e8e1111d99d8b8b4626e419e9f8e5.png" width="900" height="939" class="img_ev3q"></p><p>Asynchronous sending is a sending method in which the sender sends messages continuously without waiting for the server to return a response. |
| Asynchronous sending requires the implementation of the <strong>Asynchronous Send Callback Interface</strong> (SendCallback).</p><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</div><div class="admonitionContent_S0QG"><p>Asynchronous sending requires the implementation of the <strong>Asynchronous SendCallback Interface</strong>.</p></div></div><p>After sending a message, the sender does not need to wait for a response from the server to send the next message. The sender receives the response from the server through the callback interface and handles the result. Asynchronous sending is generally used in time-consuming and response time sensitive business scenarios. For example, the video upload notifies the start of transcoding service, and notifies the push of transcoding result after transcoding is completed.</p><p>The following is the sample code.</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 class AsyncProducer {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static void main(String[] args) throws Exception {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Initialize a producer and set the Producer group name</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Set the address of NameServer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.setNamesrvAddr("localhost:9876");</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Start Producer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.start();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.setRetryTimesWhenSendAsyncFailed(0);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> int messageCount = 100;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> final CountDownLatch countDownLatch = new CountDownLatch(messageCount);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> for (int i = 0; i < messageCount; i++) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> try {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> final int index = i;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Create a message and set the topic, tag, body and so on. The tag can be understood as a label to categorize the message, and RocketMQ can filter the tag on the consumer side.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> Message msg = new Message("TopicTest",</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> "TagA",</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Send a message asynchronously, the result is returned to the client by callback</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.send(msg, new SendCallback() {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> @Override</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public void onSuccess(SendResult sendResult) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> System.out.printf("%-10d OK %s %n", index,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> sendResult.getMsgId());</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> countDownLatch.countDown();</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"> @Override</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public void onException(Throwable e) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> System.out.printf("%-10d Exception %s %n", index, e);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> e.printStackTrace();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> countDownLatch.countDown();</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><span class="token-line" style="color:#393A34"><span class="token plain"> } catch (Exception e) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> e.printStackTrace();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> countDownLatch.countDown();</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><span class="token-line" style="color:#393A34"><span class="token plain"> //If reliable transmission is required for asynchronous sending, the logic must not be terminated until a clear result is returned from the callback interface. Otherwise, closing the Producer immediately may result in some messages not being successfully transmitted.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> countDownLatch.await(5, TimeUnit.SECONDS);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Close the producer once it is no longer in use</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.shutdown();</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><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</div><div class="admonitionContent_S0QG"><p>The only difference between asynchronous and synchronous sending methods is the parameters for calling the sending interface. Asynchronous sending does not wait for the return of send() method, instead, it will carry the SendCallback implementation. The SendCallback interface has two methods (onSuccess and onException), indicating that the message is sent successfully or failed.</p></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="33-one-way-sending">3.3 One-Way Sending<a href="#33-one-way-sending" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h3><p><img loading="lazy" alt="单项模式发送" src="/assets/images/Oneway发送-bc1379bd3b8f382c23ff7abac1e0ed95.png" width="900" height="641" class="img_ev3q"></p><p>The sender is only responsible for sending the message and does not wait for the server to return a response and no callback function is triggered, in other words, it only sends the request and does not wait for the answer. The process of sending messages in this way is very short, usually in the microsecond level. It is suitable for some scenarios where the time consumption is very short, but the reliability requirement is not high, such as log collection.</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 class OnewayProducer {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> public static void main(String[] args) throws Exception{</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Initialize a producer and set the Producer group name</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Set the address of NameServer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.setNamesrvAddr("localhost:9876");</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Start Producer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.start();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> for (int i = 0; i < 100; i++) {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> // Create a message and set the topic, tag, body and so on. The tag can be understood as a label to categorize the message, and RocketMQ can filter the tag on the consumer side.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> Message msg = new Message("TopicTest" /* Topic */,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> "TagA" /* Tag */,</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */</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"> // Since there is no request-answer processing when sending messages in the oneway method, if there is a message sending failure, data will be lost because there is no retry. If data cannot be lost, it is recommended to use the reliable synchronous or reliable asynchronous sending method.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.sendOneway(msg);</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"> // Close the producer once it is no longer in use</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> producer.shutdown();</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><p>One-way mode will call the sendOneway() method, which does not wait or process the returned result.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/rocketmq-site/tree/new-official-website/docs/02-producer/02message1.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/4.x/producer/01concept1"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Core Concept</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/4.x/producer/03message2"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Ordered Message Sending</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#1creating-topic-in-cluster" class="table-of-contents__link toc-highlight">1.Creating Topic in Cluster</a></li><li><a href="#2adding-client-side-dependency" class="table-of-contents__link toc-highlight">2.Adding Client-Side Dependency</a></li><li><a href="#3message-sending" class="table-of-contents__link toc-highlight">3.Message Sending</a><ul><li><a href="#31-synchronous-sending" class="table-of-contents__link toc-highlight">3.1 Synchronous Sending</a></li><li><a href="#32-asynchronous-sending" class="table-of-contents__link toc-highlight">3.2 Asynchronous Sending</a></li><li><a href="#33-one-way-sending" class="table-of-contents__link toc-highlight">3.3 One-Way Sending</a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Learn</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs/domainModel/01main">Introduction</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/quickStart/01quickstart">Installation</a></li><li class="footer__item"><a class="footer__link-item" href="/version">Migration from 4.x to 5.0</a></li></ul></div><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://twitter.com/ApacheRocketMQ" target="_blank" rel="noopener noreferrer" class="footer__link-item">Twitter<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://github.com/apache/rocketmq" target="_blank" rel="noopener noreferrer" class="footer__link-item">Github</a></li><li class="footer__item"><a href="https://github.com/apache/rocketmq" target="_blank" rel="noopener noreferrer" class="footer__link-item">Help</a></li></ul></div><div class="col footer__col"><div class="footer__title">More</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/blog">Blog</a></li><li class="footer__item"><a class="footer__link-item" href="/release-notes">Changelog</a></li><li class="footer__item"><a href="https://github.com/apache/rocketmq" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://twitter.com/docusaurus" target="_blank" rel="noopener noreferrer" class="footer__link-item">Twitter<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div><div class="col footer__col"><div class="footer__title">Legal</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://www.apache.org/licenses/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Licenses<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://www.apache.org/security/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Security<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://www.apache.org/foundation/thanks.html" target="_blank" rel="noopener noreferrer" class="footer__link-item">Thanks<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li><li class="footer__item"><a href="https://www.apache.org/foundation/sponsorship.html" target="_blank" rel="noopener noreferrer" class="footer__link-item">Sponsorship<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path></svg></a></li></ul></div></div><div class="footer__bottom text--center"><div class="margin-bottom--sm"><a href="https://rocketmq.apache.org/" rel="noopener noreferrer" class="footerLogoLink_BH7S"><img src="/img/Apache_RocketMQ_logo.svg.png" alt="Meta Open Source Logo" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/Apache_RocketMQ_logo.svg.png" alt="Meta Open Source Logo" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></a></div><div class="footer__copyright">Copyright © 2022 The Apache Software Foundation. Licensed under the Apache License, Version 2.0.</div></div></div></footer></div> |
