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content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active">Java<meta itemprop="position" content="3"></li></ul></nav><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"><header><h1>OpenFeature Java SDK</h1></header><a href="https://github.com/open-feature/spec/releases/tag/v0.7.0"><img alt="Specification" src="https://img.shields.io/static/v1?label=specification&message=v0.7.0&color=yellow&style=for-the-badge"></a><a href="https://github.com/open-feature/java-sdk/releases/tag/v1.14.1"><img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v1.14.1&color=blue&style=for-the-badge"></a> <a href="https://javadoc.io/doc/dev.openfeature/sdk"><img alt="Javadoc" src="https://javadoc.io/badge2/dev.openfeature/sdk/javadoc.svg"></a><a href="https://maven-badges.herokuapp.com/maven-central/dev.openfeature/sdk"><img alt="Maven Central" src="https://maven-badges.herokuapp.com/maven-central/dev.openfeature/sdk/badge.svg"></a><a href="https://codecov.io/gh/open-feature/java-sdk"><img alt="Codecov" src="https://codecov.io/gh/open-feature/java-sdk/branch/main/graph/badge.svg?token=XMS9L7PBY1"></a><a href="https://bestpractices.coreinfrastructure.org/projects/6241"><img alt="CII Best Practices" src="https://bestpractices.coreinfrastructure.org/projects/6241/badge"></a> <h2 class="anchor anchorWithStickyNavbar_LWe7" id="quick-start">Quick start<a href="#quick-start" class="hash-link" aria-label="Direct link to Quick start" title="Direct link to Quick start"></a></h2> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="requirements">Requirements<a href="#requirements" class="hash-link" aria-label="Direct link to Requirements" title="Direct link to Requirements"></a></h3> <ul> <li>Java 8+ (compiler target is 1.8)</li> </ul> Note that this library is intended to be used in server-side contexts and has not been evaluated for use on mobile devices. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="install">Install<a href="#install" class="hash-link" aria-label="Direct link to Install" title="Direct link to Install"></a></h3> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="maven">Maven<a href="#maven" class="hash-link" aria-label="Direct link to Maven" title="Direct link to Maven"></a></h4> <div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv"><dependency> <groupId>dev.openfeature</groupId> <artifactId>sdk</artifactId> <version>1.14.1</version> </dependency> </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> If you would like snapshot builds, this is the relevant repository information: <div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv"><repositories> <repository> <snapshots> <enabled>true</enabled> </snapshots> <id>sonatype</id> <name>Sonatype Repository</name> <url>https://s01.oss.sonatype.org/content/repositories/snapshots/</url> </repository> </repositories> </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="gradle">Gradle<a href="#gradle" class="hash-link" aria-label="Direct link to Gradle" title="Direct link to Gradle"></a></h4> <div class="language-groovy codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-groovy codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">dependencies { implementation 'dev.openfeature:sdk:1.14.1' } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="usage">Usage<a href="#usage" class="hash-link" aria-label="Direct link to Usage" title="Direct link to Usage"></a></h3> <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">public void example(){ // flags defined in memory Map<String, Flag<?>> myFlags = new HashMap<>(); myFlags.put("v2_enabled", Flag.builder() .variant("on", true) .variant("off", false) .defaultVariant("on") .build()); // configure a provider OpenFeatureAPI api = OpenFeatureAPI.getInstance(); api.setProviderAndWait(new InMemoryProvider(myFlags)); // create a client Client client = api.getClient(); // get a bool flag value boolean flagValue = client.getBooleanValue("v2_enabled", false); } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="api-reference">API Reference<a href="#api-reference" class="hash-link" aria-label="Direct link to API Reference" title="Direct link to API Reference"></a></h3> See <a href="https://javadoc.io/doc/dev.openfeature/sdk/latest/" target="_blank" rel="noopener noreferrer">here</a> for the Javadocs. <h2 class="anchor anchorWithStickyNavbar_LWe7" id="features">Features<a href="#features" class="hash-link" aria-label="Direct link to Features" title="Direct link to Features"></a></h2> <table><thead><tr><th>Status</th><th>Features</th><th>Description</th></tr></thead><tbody><tr><td>✅</td><td><a href="#providers">Providers</a></td><td>Integrate with a commercial, open source, or in-house feature management tool.</td></tr><tr><td>✅</td><td><a href="#targeting">Targeting</a></td><td>Contextually-aware flag evaluation using <a href="/docs/reference/concepts/evaluation-context">evaluation context</a>.</td></tr><tr><td>✅</td><td><a href="#hooks">Hooks</a></td><td>Add functionality to various stages of the flag evaluation life-cycle.</td></tr><tr><td>✅</td><td><a href="#tracking">Tracking</a></td><td>Associate user actions with feature flag evaluations.</td></tr><tr><td>✅</td><td><a href="#logging">Logging</a></td><td>Integrate with popular logging packages.</td></tr><tr><td>✅</td><td><a href="#domains">Domains</a></td><td>Logically bind clients with providers.</td></tr><tr><td>✅</td><td><a href="#eventing">Eventing</a></td><td>React to state changes in the provider or flag management system.</td></tr><tr><td>✅</td><td><a href="#shutdown">Shutdown</a></td><td>Gracefully clean up a provider during application shutdown.</td></tr><tr><td>✅</td><td><a href="#transaction-context-propagation">Transaction Context Propagation</a></td><td>Set a specific <a href="/docs/reference/concepts/evaluation-context">evaluation context</a> for a transaction (e.g. an HTTP request or a thread).</td></tr><tr><td>✅</td><td><a href="#extending">Extending</a></td><td>Extend OpenFeature with custom providers and hooks.</td></tr></tbody></table> Implemented: ✅ | In-progress: ⚠️ | Not implemented yet: ❌ <h3 class="anchor anchorWithStickyNavbar_LWe7" id="providers">Providers<a href="#providers" class="hash-link" aria-label="Direct link to Providers" title="Direct link to Providers"></a></h3> <a href="/docs/reference/concepts/provider">Providers</a> are an abstraction between a flag management system and the OpenFeature SDK. Look <a href="/ecosystem?instant_search%5BrefinementList%5D%5Btype%5D%5B0%5D=Provider&instant_search%5BrefinementList%5D%5Btechnology%5D%5B0%5D=Java">here</a> for a complete list of available providers. If the provider you're looking for hasn't been created yet, see the <a href="#develop-a-provider">develop a provider</a> section to learn how to build it yourself. Once you've added a provider as a dependency, it can be registered with OpenFeature like this: <h4 class="anchor anchorWithStickyNavbar_LWe7" id="synchronous">Synchronous<a href="#synchronous" class="hash-link" aria-label="Direct link to Synchronous" title="Direct link to Synchronous"></a></h4> To register a provider in a blocking manner to ensure it is ready before further actions are taken, you can use the <code>setProviderAndWait</code> method as shown below: <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv"> OpenFeatureAPI api = OpenFeatureAPI.getInstance(); api.setProviderAndWait(new MyProvider()); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="asynchronous">Asynchronous<a href="#asynchronous" class="hash-link" aria-label="Direct link to Asynchronous" title="Direct link to Asynchronous"></a></h4> To register a provider in a non-blocking manner, you can use the <code>setProvider</code> method as shown below: <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv"> OpenFeatureAPI.getInstance().setProvider(new MyProvider()); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> In some situations, it may be beneficial to register multiple providers in the same application. This is possible using <a href="#domains">domains</a>, which is covered in more detail below. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="targeting">Targeting<a href="#targeting" class="hash-link" aria-label="Direct link to Targeting" title="Direct link to Targeting"></a></h3> Sometimes, the value of a flag must consider some dynamic criteria about the application or user, such as the user's location, IP, email address, or the server's location. In OpenFeature, we refer to this as <a href="/specification/glossary#targeting">targeting</a>. If the flag management system you're using supports targeting, you can provide the input data using the <a href="/docs/reference/concepts/evaluation-context">evaluation context</a>. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// set a value to the global context OpenFeatureAPI api = OpenFeatureAPI.getInstance(); Map<String, Value> apiAttrs = new HashMap<>(); apiAttrs.put("region", new Value(System.getEnv("us-east-1"))); EvaluationContext apiCtx = new ImmutableContext(apiAttrs); api.setEvaluationContext(apiCtx); // set a value to the client context Map<String, Value> clientAttrs = new HashMap<>(); clientAttrs.put("region", new Value(System.getEnv("us-east-1"))); EvaluationContext clientCtx = new ImmutableContext(clientAttrs); Client client = api.getInstance().getClient(); client.setEvaluationContext(clientCtx); // set a value to the invocation context Map<String, Value> requestAttrs = new HashMap<>(); requestAttrs.put("email", new Value(session.getAttribute("email"))); requestAttrs.put("product", new Value("productId")); String targetingKey = session.getId(); EvaluationContext reqCtx = new ImmutableContext(targetingKey, requestAttrs); boolean flagValue = client.getBooleanValue("some-flag", false, reqCtx); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="hooks">Hooks<a href="#hooks" class="hash-link" aria-label="Direct link to Hooks" title="Direct link to Hooks"></a></h3> <a href="/docs/reference/concepts/hooks">Hooks</a> allow for custom logic to be added at well-defined points of the flag evaluation life-cycle Look <a href="/ecosystem?instant_search%5BrefinementList%5D%5Btype%5D%5B0%5D=Hook&instant_search%5BrefinementList%5D%5Btechnology%5D%5B0%5D=Java">here</a> for a complete list of available hooks. If the hook you're looking for hasn't been created yet, see the <a href="#develop-a-hook">develop a hook</a> section to learn how to build it yourself. Once you've added a hook as a dependency, it can be registered at the global, client, or flag invocation level. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv"> // add a hook globally, to run on all evaluations OpenFeatureAPI api = OpenFeatureAPI.getInstance(); api.addHooks(new ExampleHook()); // add a hook on this client, to run on all evaluations made by this client Client client = api.getClient(); client.addHooks(new ExampleHook()); // add a hook for this evaluation only Boolean retval = client.getBooleanValue(flagKey, false, null, FlagEvaluationOptions.builder().hook(new ExampleHook()).build()); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="tracking">Tracking<a href="#tracking" class="hash-link" aria-label="Direct link to Tracking" title="Direct link to Tracking"></a></h3> The <a href="/specification/sections/tracking/">tracking API</a> allows you to use OpenFeature abstractions to associate user actions with feature flag evaluations. This is essential for robust experimentation powered by feature flags. Note that, unlike methods that handle feature flag evaluations, calling <code>track(...)</code> may throw an <code>IllegalArgumentException</code> if an empty string is passed as the <code>trackingEventName</code>. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">OpenFeatureAPI api = OpenFeatureAPI.getInstance(); api.getClient().track("visited-promo-page", new MutableTrackingEventDetails(99.77).add("currency", "USD")); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="logging">Logging<a href="#logging" class="hash-link" aria-label="Direct link to Logging" title="Direct link to Logging"></a></h3> The Java SDK uses SLF4J. See the <a href="https://slf4j.org/manual.html" target="_blank" rel="noopener noreferrer">SLF4J manual</a> for complete documentation. Note that in accordance with the OpenFeature specification, the SDK doesn't generally log messages during flag evaluation. <h4 class="anchor anchorWithStickyNavbar_LWe7" id="logging-hook">Logging Hook<a href="#logging-hook" class="hash-link" aria-label="Direct link to Logging Hook" title="Direct link to Logging Hook"></a></h4> The Java SDK includes a <code>LoggingHook</code>, which logs detailed information at key points during flag evaluation, using SLF4J's structured logging API. This hook can be particularly helpful for troubleshooting and debugging; simply attach it at the global, client or invocation level and ensure your log level is set to "debug". See <a href="#hooks">hooks</a> for more information on configuring hooks. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="domains">Domains<a href="#domains" class="hash-link" aria-label="Direct link to Domains" title="Direct link to Domains"></a></h3> Clients can be assigned to a domain. A domain is a logical identifier which can be used to associate clients with a particular provider. If a domain has no associated provider, the global provider is used. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">FeatureProvider scopedProvider = new MyProvider(); // registering the default provider OpenFeatureAPI.getInstance().setProvider(LocalProvider()); // registering a provider to a domain OpenFeatureAPI.getInstance().setProvider("my-domain", new CachedProvider()); // A client bound to the default provider Client clientDefault = OpenFeatureAPI.getInstance().getClient(); // A client bound to the CachedProvider provider Client domainScopedClient = OpenFeatureAPI.getInstance().getClient("my-domain"); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> Providers for domains can be set in a blocking or non-blocking way. For more details, please refer to the <a href="#providers">providers</a> section. <h3 class="anchor anchorWithStickyNavbar_LWe7" id="eventing">Eventing<a href="#eventing" class="hash-link" aria-label="Direct link to Eventing" title="Direct link to Eventing"></a></h3> Events allow you to react to state changes in the provider or underlying flag management system, such as flag definition changes, provider readiness, or error conditions. Initialization events (<code>PROVIDER_READY</code> on success, <code>PROVIDER_ERROR</code> on failure) are dispatched for every provider. Some providers support additional events, such as <code>PROVIDER_CONFIGURATION_CHANGED</code>. Please refer to the documentation of the provider you're using to see what events are supported. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// add an event handler to a client Client client = OpenFeatureAPI.getInstance().getClient(); client.onProviderConfigurationChanged((EventDetails eventDetails) -> { // do something when the provider's flag settings change }); // add an event handler to the global API OpenFeatureAPI.getInstance().onProviderStale((EventDetails eventDetails) -> { // do something when the provider's cache goes stale }); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="shutdown">Shutdown<a href="#shutdown" class="hash-link" aria-label="Direct link to Shutdown" title="Direct link to Shutdown"></a></h3> The OpenFeature API provides a close function to perform a cleanup of all registered providers. This should only be called when your application is in the process of shutting down. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// shut down all providers OpenFeatureAPI.getInstance().shutdown(); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="transaction-context-propagation">Transaction Context Propagation<a href="#transaction-context-propagation" class="hash-link" aria-label="Direct link to Transaction Context Propagation" title="Direct link to Transaction Context Propagation"></a></h3> Transaction context is a container for transaction-specific evaluation context (e.g. user id, user agent, IP). Transaction context can be set where specific data is available (e.g. an auth service or request handler) and by using the transaction context propagator it will automatically be applied to all flag evaluations within a transaction (e.g. a request or thread). By default, the <code>NoOpTransactionContextPropagator</code> is used, which doesn't store anything. To register a <code>ThreadLocal</code> context propagator, you can use the <code>setTransactionContextPropagator</code> method as shown below. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// registering the ThreadLocalTransactionContextPropagator OpenFeatureAPI.getInstance().setTransactionContextPropagator(new ThreadLocalTransactionContextPropagator()); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> Once you've registered a transaction context propagator, you can propagate the data into request-scoped transaction context. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">// adding userId to transaction context OpenFeatureAPI api = OpenFeatureAPI.getInstance(); Map<String, Value> transactionAttrs = new HashMap<>(); transactionAttrs.put("userId", new Value("userId")); EvaluationContext transactionCtx = new ImmutableContext(transactionAttrs); api.setTransactionContext(transactionCtx); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> Additionally, you can develop a custom transaction context propagator by implementing the <code>TransactionContextPropagator</code> interface and registering it as shown above. <h2 class="anchor anchorWithStickyNavbar_LWe7" id="extending">Extending<a href="#extending" class="hash-link" aria-label="Direct link to Extending" title="Direct link to Extending"></a></h2> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="develop-a-provider">Develop a provider<a href="#develop-a-provider" class="hash-link" aria-label="Direct link to Develop a provider" title="Direct link to Develop a provider"></a></h3> To develop a provider, you need to create a new project and include the OpenFeature SDK as a dependency. This can be a new repository or included in <a href="https://github.com/open-feature/java-sdk-contrib" target="_blank" rel="noopener noreferrer">the existing contrib repository</a> available under the OpenFeature organization. You’ll then need to write the provider by implementing the <code>FeatureProvider</code> interface exported by the OpenFeature SDK. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">public class MyProvider implements FeatureProvider { @Override public Metadata getMetadata() { return () -> "My Provider"; } @Override public void initialize(EvaluationContext evaluationContext) throws Exception { // start up your provider } @Override public void shutdown() { // shut down your provider } @Override public ProviderEvaluation<Boolean> getBooleanEvaluation(String key, Boolean defaultValue, EvaluationContext ctx) { // resolve a boolean flag value } @Override public ProviderEvaluation<String> getStringEvaluation(String key, String defaultValue, EvaluationContext ctx) { // resolve a string flag value } @Override public ProviderEvaluation<Integer> getIntegerEvaluation(String key, Integer defaultValue, EvaluationContext ctx) { // resolve an int flag value } @Override public ProviderEvaluation<Double> getDoubleEvaluation(String key, Double defaultValue, EvaluationContext ctx) { // resolve a double flag value } @Override public ProviderEvaluation<Value> getObjectEvaluation(String key, Value defaultValue, EvaluationContext ctx) { // resolve an object flag value } } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> If you'd like your provider to support firing events, such as events for when flags are changed in the flag management system, extend <code>EventProvider</code>. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">class MyEventProvider extends EventProvider { @Override public Metadata getMetadata() { return () -> "My Event Provider"; } @Override public void initialize(EvaluationContext evaluationContext) throws Exception { // emit events when flags are changed in a hypothetical REST API this.restApiClient.onFlagsChanged(() -> { ProviderEventDetails details = ProviderEventDetails.builder().message("flags changed in API!").build(); this.emitProviderConfigurationChanged(details); }); } @Override public void shutdown() { // shut down your provider } // remaining provider methods... } </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> Providers no longer need to manage their own state, this is done by the SDK itself. If desired, the state of a provider can be queried through the client that uses the provider. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">OpenFeatureAPI.getInstance().getClient().getProviderState(); </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <blockquote> Built a new provider? <a href="https://github.com/open-feature/openfeature.dev/issues/new?assignees=&labels=provider&projects=&template=document-provider.yaml&title=%5BProvider%5D%3A+" target="_blank" rel="noopener noreferrer">Let us know</a> so we can add it to the docs! </blockquote> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="develop-a-hook">Develop a hook<a href="#develop-a-hook" class="hash-link" aria-label="Direct link to Develop a hook" title="Direct link to Develop a hook"></a></h3> To develop a hook, you need to create a new project and include the OpenFeature SDK as a dependency. This can be a new repository or included in <a href="https://github.com/open-feature/java-sdk-contrib" target="_blank" rel="noopener noreferrer">the existing contrib repository</a> available under the OpenFeature organization. Implement your own hook by conforming to the <code>Hook interface</code>. <div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:#282c34;--prism-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="background-color:#282c34;color:#ffffff"><code class="codeBlockLines_e6Vv">class MyHook implements Hook { @Override public Optional before(HookContext ctx, Map hints) { // code that runs before the flag evaluation } @Override public void after(HookContext ctx, FlagEvaluationDetails details, Map hints) { // code that runs after the flag evaluation succeeds } @Override public void error(HookContext ctx, Exception error, Map hints) { // code that runs when there's an error during a flag evaluation } @Override public void finallyAfter(HookContext ctx, FlagEvaluationDetails details, Map hints) { // code that runs regardless of success or error } }; </code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><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></button></div></div></div> <blockquote> Built a new hook? <a href="https://github.com/open-feature/openfeature.dev/issues/new?assignees=&labels=hook&projects=&template=document-hook.yaml&title=%5BHook%5D%3A+" target="_blank" rel="noopener noreferrer">Let us know</a> so we can add it to the docs! </blockquote></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a 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