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type="button"></button><div class="docPage__5DB"><main class="docMainContainer_gTbr docMainContainerEnhanced_Uz_u"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><span class="theme-doc-version-badge badge badge--secondary">Version: Next</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>CLAUDE.md</h1><p>This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="essential-commands">Essential Commands<a href="#essential-commands" class="hash-link" aria-label="Direct link to Essential Commands" title="Direct link to Essential Commands"></a></h2><p><strong>Build and test:</strong></p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew build </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Build entire project</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew check </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Run all tests and linting</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Note that each directory typically has a build.gradle file, but the available tasks follow similar conventions.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Java code.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew spotlessApply </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Java code formatting</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Python code.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew :metadata-ingestion:testQuick </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Fast Python unit tests</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew :metadata-ingestion:lint </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Python linting (ruff, mypy)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew :metadata-ingestion:lintFix </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Python linting auto-fix (ruff only)</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>If you are using git worktrees then exclude this as that might cause git related failures when running any gradle command.</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><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:#bfc7d5"><span class="token plain">./gradlew ... -x generateGitPropertiesGlobal</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><strong>IMPORTANT: Verifying Python code changes:</strong></p><ul><li><strong>ALWAYS use <code>./gradlew :metadata-ingestion:lintFix</code></strong> to verify Python code changes</li><li><strong>NEVER use <code>python3 -m py_compile</code></strong> - it doesn't catch style issues or type errors</li><li>lintFix runs ruff formatting and fixing automatically, ensuring code quality</li><li>For smoke-test changes, the lintFix command will also check those files</li></ul><p><strong>Development setup:</strong></p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew :metadata-ingestion:installDev </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Setup Python environment</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew quickstartDebug </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Start full DataHub stack</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token builtin class-name" style="color:rgb(255, 203, 107)">cd</span><span class="token plain"> datahub-web-react </span><span class="token operator" style="color:rgb(137, 221, 255)">&&</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">yarn</span><span class="token plain"> start </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Frontend dev server</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="architecture-overview">Architecture Overview<a href="#architecture-overview" class="hash-link" aria-label="Direct link to Architecture Overview" title="Direct link to Architecture Overview"></a></h2><p>DataHub is a <strong>schema-first, event-driven metadata platform</strong> with three core layers:</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="core-services">Core Services<a href="#core-services" class="hash-link" aria-label="Direct link to Core Services" title="Direct link to Core Services"></a></h3><ul><li><strong>GMS (Generalized Metadata Service)</strong>: Java/Spring backend handling metadata storage and REST/GraphQL APIs</li><li><strong>Frontend</strong>: React/TypeScript application consuming GraphQL APIs</li><li><strong>Ingestion Framework</strong>: Python CLI and connectors for extracting metadata from data sources</li><li><strong>Event Streaming</strong>: Kafka-based real-time metadata change propagation</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="key-modules">Key Modules<a href="#key-modules" class="hash-link" aria-label="Direct link to Key Modules" title="Direct link to Key Modules"></a></h3><ul><li><code>metadata-models/</code>: Avro/PDL schemas defining the metadata model</li><li><code>metadata-service/</code>: Backend services, APIs, and business logic</li><li><code>datahub-web-react/</code>: Frontend React application</li><li><code>metadata-ingestion/</code>: Python ingestion framework and CLI</li><li><code>datahub-graphql-core/</code>: GraphQL schema and resolvers</li></ul><p>Most of the non-frontend modules are written in Java. The modules written in Python are:</p><ul><li><code>metadata-ingestion/</code></li><li><code>datahub-actions/</code></li><li><code>metadata-ingestion-modules/airflow-plugin/</code></li><li><code>metadata-ingestion-modules/gx-plugin/</code></li><li><code>metadata-ingestion-modules/dagster-plugin/</code></li><li><code>metadata-ingestion-modules/prefect-plugin/</code></li></ul><p>Each Python module has a gradle setup similar to <code>metadata-ingestion/</code> (documented above)</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="metadata-model-concepts">Metadata Model Concepts<a href="#metadata-model-concepts" class="hash-link" aria-label="Direct link to Metadata Model Concepts" title="Direct link to Metadata Model Concepts"></a></h3><ul><li><strong>Entities</strong>: Core objects (Dataset, Dashboard, Chart, CorpUser, etc.)</li><li><strong>Aspects</strong>: Metadata facets (Ownership, Schema, Documentation, etc.)</li><li><strong>URNs</strong>: Unique identifiers (<code>urn:li:dataset:(urn:li:dataPlatform:mysql,db.table,PROD)</code>)</li><li><strong>MCE/MCL</strong>: Metadata Change Events/Logs for updates</li><li><strong>Entity Registry</strong>: YAML config defining entity-aspect relationships (<code>metadata-models/src/main/resources/entity-registry.yml</code>)</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="validation-architecture">Validation Architecture<a href="#validation-architecture" class="hash-link" aria-label="Direct link to Validation Architecture" title="Direct link to Validation Architecture"></a></h3><p><strong>IMPORTANT</strong>: Validation must work across all APIs (GraphQL, OpenAPI, RestLI).</p><ul><li><strong>Never add validation in API-specific layers</strong> (GraphQL resolvers, REST controllers) - this only protects one API</li><li><strong>Always implement AspectPayloadValidators</strong> in <code>metadata-io/src/main/java/com/linkedin/metadata/aspect/validation/</code></li><li><strong>Register as Spring beans</strong> in <code>SpringStandardPluginConfiguration.java</code></li><li><strong>Follow existing patterns</strong>: See <code>SystemPolicyValidator.java</code> and <code>PolicyFieldTypeValidator.java</code> as examples</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="development-flow">Development Flow<a href="#development-flow" class="hash-link" aria-label="Direct link to Development Flow" title="Direct link to Development Flow"></a></h2><ol><li><strong>Schema changes</strong> in <code>metadata-models/</code> trigger code generation across all languages</li><li><strong>Backend changes</strong> in <code>metadata-service/</code> and other Java modules expose new REST/GraphQL APIs</li><li><strong>Frontend changes</strong> in <code>datahub-web-react/</code> consume GraphQL APIs</li><li><strong>Ingestion changes</strong> in <code>metadata-ingestion/</code> emit metadata to backend APIs</li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="code-standards">Code Standards<a href="#code-standards" class="hash-link" aria-label="Direct link to Code Standards" title="Direct link to Code Standards"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="general-principles">General Principles<a href="#general-principles" class="hash-link" aria-label="Direct link to General Principles" title="Direct link to General Principles"></a></h3><ul><li>This is production code - maintain high quality</li><li>Follow existing patterns within each module</li><li>Generate appropriate unit tests</li><li>Use type annotations everywhere (Python/TypeScript)</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="language-specific">Language-Specific<a href="#language-specific" class="hash-link" aria-label="Direct link to Language-Specific" title="Direct link to Language-Specific"></a></h3><ul><li><strong>Java</strong>: Use Spotless formatting, Spring Boot patterns, TestNG/JUnit Jupiter for tests</li><li><strong>Python</strong>: Use ruff for linting/formatting, pytest for testing, pydantic for configs<ul><li><strong>Type Safety</strong>: Everything must have type annotations, avoid <code>Any</code> type, use specific types (<code>Dict[str, int]</code>, <code>TypedDict</code>)</li><li><strong>Data Structures</strong>: Prefer dataclasses/pydantic for internal data, return dataclasses over tuples</li><li><strong>Code Quality</strong>: Avoid global state, use named arguments, don't re-export in <code>__init__.py</code>, refactor repetitive code</li><li><strong>Error Handling</strong>: Robust error handling with layers of protection for known failure points</li></ul></li><li><strong>TypeScript</strong>: Use Prettier formatting, strict types (no <code>any</code>), React Testing Library</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="code-comments">Code Comments<a href="#code-comments" class="hash-link" aria-label="Direct link to Code Comments" title="Direct link to Code Comments"></a></h3><p>Only add comments that provide real value beyond what the code already expresses.</p><p><strong>Do NOT</strong> add comments for:</p><ul><li>Obvious operations (<code># Get user by ID</code>, <code>// Create connection</code>)</li><li>What the code does when it's self-evident (<code># Loop through items</code>, <code>// Set variable to true</code>)</li><li>Restating parameter names or return types already in signatures</li><li>Basic language constructs (<code># Import modules</code>, <code>// End of function</code>)</li></ul><p><strong>DO</strong> add comments for:</p><ul><li><strong>Why</strong> something is done, especially non-obvious business logic or workarounds</li><li><strong>Context</strong> about external constraints, API quirks, or domain knowledge</li><li><strong>Warnings</strong> about gotchas, performance implications, or side effects</li><li><strong>References</strong> to tickets, RFCs, or external documentation that explain decisions</li><li><strong>Complex algorithms</strong> or mathematical formulas that aren't immediately clear</li><li><strong>Temporary solutions</strong> with TODOs and context for future improvements</li></ul><p>Examples:</p><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Good: Explains WHY and provides context</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Use a 30-second timeout because Snowflake's query API can hang indefinitely</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># on large result sets. See issue #12345.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">connection_timeout </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">30</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Bad: Restates what's obvious from code</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic"># Set connection timeout to 30 seconds</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">connection_timeout </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">30</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="testing-strategy">Testing Strategy<a href="#testing-strategy" class="hash-link" aria-label="Direct link to Testing Strategy" title="Direct link to Testing Strategy"></a></h3><ul><li>Python: Tests go in the <code>tests/</code> directory alongside <code>src/</code>, use <code>assert</code> statements</li><li>Java: Tests alongside source in <code>src/test/</code></li><li>Frontend: Tests in <code>__tests__/</code> or <code>.test.tsx</code> files</li><li>Smoke tests go in the <code>smoke-test/</code> directory</li></ul><h4 class="anchor anchorWithStickyNavbar_LWe7" id="testing-principles-focus-on-value-over-coverage">Testing Principles: Focus on Value Over Coverage<a href="#testing-principles-focus-on-value-over-coverage" class="hash-link" aria-label="Direct link to Testing Principles: Focus on Value Over Coverage" title="Direct link to Testing Principles: Focus on Value Over Coverage"></a></h4><p><strong>IMPORTANT</strong>: Quality over quantity. Avoid AI-generated test anti-patterns that create maintenance burden without providing real value.</p><p><strong>Focus on behavior, not implementation</strong>:</p><ul><li>✅ Test what the code does (business logic, edge cases that occur in production)</li><li>❌ Don't test how it does it (implementation details, private fields via reflection)</li><li>❌ Don't test third-party libraries work correctly (Spring, Micrometer, Kafka clients, etc.)</li><li>❌ Don't test Java/Python language features (<code>synchronized</code> methods are thread-safe, <code>@Nonnull</code> parameters reject nulls)</li></ul><p><strong>Avoid these specific anti-patterns</strong>:</p><ul><li>❌ Testing null inputs on <code>@Nonnull</code>/<code>@NonNull</code> annotated parameters</li><li>❌ Verifying exact error message wording (creates brittleness during refactoring)</li><li>❌ Testing every possible input variation (case sensitivity × whitespace × special chars = maintenance nightmare)</li><li>❌ Using reflection to verify private implementation details</li><li>❌ Redundant concurrency testing on <code>synchronized</code> methods</li><li>❌ Testing obvious getter/setter behavior without business logic</li><li>❌ Testing Lombok-generated code (<code>@Data</code>, <code>@Builder</code>, <code>@Value</code> classes) - you're testing Lombok's code generator, not your logic</li><li>❌ Testing that annotations exist on classes - if required annotations are missing, the framework/compiler will fail at startup, not in your tests</li></ul><p><strong>Appropriate test scope</strong>:</p><ul><li><strong>Simple utilities</strong> (enums, string parsing, formatters): ~50-100 lines of focused tests<ul><li>Happy path for each method</li><li>One example of invalid input per method</li><li>Edge cases likely to occur in production</li></ul></li><li><strong>Complex business logic</strong>: Test proportional to risk and complexity<ul><li>Integration points and system boundaries</li><li>Security-critical operations</li><li>Error handling for realistic failure scenarios</li></ul></li><li><strong>Warning sign</strong>: If tests are 5x+ the size of implementation, reconsider scope</li></ul><p><strong>Examples of low-value tests to avoid</strong>:</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><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:#bfc7d5"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// ❌ BAD: Testing @Nonnull contract (framework's job)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token annotation punctuation" style="color:rgb(199, 146, 234)">@Test</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">testNullParameterThrowsException</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertThrows</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">NullPointerException</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">class</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">-></span><span class="token plain"> service</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">process</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token keyword" style="font-style:italic">null</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// parameter is @Nonnull</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// ❌ BAD: Testing Lombok-generated code</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token annotation punctuation" style="color:rgb(199, 146, 234)">@Test</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">testBuilderSetsAllFields</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">MyConfig</span><span class="token plain"> config </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">MyConfig</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">builder</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">field1</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"value1"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">field2</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"value2"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">build</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">config</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">getField1</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"value1"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">config</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">getField2</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"value2"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// ❌ BAD: Testing that annotations exist</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token annotation punctuation" style="color:rgb(199, 146, 234)">@Test</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">testConfigurationAnnotations</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertNotNull</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">MyConfig</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">class</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">getAnnotation</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">Configuration</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">class</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertNotNull</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">MyConfig</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">class</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">getAnnotation</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">ComponentScan</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">class</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// If @Configuration is missing, Spring won't load the context - you don't need a test for this</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// ❌ BAD: Exact error message (brittle)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">exception</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">getMessage</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"Unsupported database type 'oracle'. Only PostgreSQL and MySQL variants are supported."</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// ❌ BAD: Redundant variations</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromString</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"postgresql"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">POSTGRES</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromString</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"PostgreSQL"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">POSTGRES</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromString</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"POSTGRESQL"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">POSTGRES</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromString</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">" postgresql "</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">POSTGRES</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// ... 10 more case/whitespace variations</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// ✅ GOOD: Focused behavioral test</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token annotation punctuation" style="color:rgb(199, 146, 234)">@Test</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">testFromString_ValidInputsCaseInsensitive</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromString</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"postgresql"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">POSTGRES</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromString</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"POSTGRESQL"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">POSTGRES</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertEquals</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromString</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">" postgresql "</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">POSTGRES</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token annotation punctuation" style="color:rgb(199, 146, 234)">@Test</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">testFromString_InvalidInputThrows</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertThrows</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">IllegalArgumentException</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">class</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DatabaseType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromString</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"oracle"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// ✅ GOOD: Testing YOUR custom validation logic on a Lombok class</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token annotation punctuation" style="color:rgb(199, 146, 234)">@Test</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">testCustomValidation</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">assertThrows</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">IllegalArgumentException</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token keyword" style="font-style:italic">class</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">-></span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">MyConfig</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">builder</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">field1</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"invalid"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">build</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">validate</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</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><strong>When in doubt</strong>: Ask "Does this test protect against a realistic regression?" If not, skip it.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="security-testing-configuration-property-classification">Security Testing: Configuration Property Classification<a href="#security-testing-configuration-property-classification" class="hash-link" aria-label="Direct link to Security Testing: Configuration Property Classification" title="Direct link to Security Testing: Configuration Property Classification"></a></h4><p><strong>Critical test</strong>: <code>metadata-io/src/test/java/com/linkedin/metadata/system_info/collectors/PropertiesCollectorConfigurationTest.java</code></p><p>This test prevents sensitive data leaks by requiring explicit classification of all configuration properties as either sensitive (redacted) or non-sensitive (visible in system info).</p><p><strong>When adding new configuration properties</strong>: The test will fail with clear instructions on which classification list to add your property to. Refer to the test file's comprehensive documentation for template syntax and examples.</p><p>This is a mandatory security guardrail - never disable or skip this test.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="commits">Commits<a href="#commits" class="hash-link" aria-label="Direct link to Commits" title="Direct link to Commits"></a></h3><ul><li>Follow Conventional Commits format for commit messages</li><li>Breaking Changes: Always update <code>docs/how/updating-datahub.md</code> for breaking changes. Write entries for non-technical audiences, reference the PR number, and focus on what users need to change rather than internal implementation details</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="key-documentation">Key Documentation<a href="#key-documentation" class="hash-link" aria-label="Direct link to Key Documentation" title="Direct link to Key Documentation"></a></h2><p><strong>Essential reading:</strong></p><ul><li><code>docs/architecture/architecture.md</code> - System architecture overview</li><li><code>docs/modeling/metadata-model.md</code> - How metadata is modeled</li><li><code>docs/what-is-datahub/datahub-concepts.md</code> - Core concepts (URNs, entities, etc.)</li></ul><p><strong>External docs:</strong></p><ul><li><a href="https://docs.datahub.com/docs/developers" target="_blank" rel="noopener noreferrer">https://docs.datahub.com/docs/developers</a> - Official developer guide</li><li><a href="https://demo.datahub.com/" target="_blank" rel="noopener noreferrer">https://demo.datahub.com/</a> - Live demo environment</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="important-notes">Important Notes<a href="#important-notes" class="hash-link" aria-label="Direct link to Important Notes" title="Direct link to Important Notes"></a></h2><ul><li>Entity Registry is defined in YAML, not code (<code>entity-registry.yml</code>)</li><li>All metadata changes flow through the event streaming system</li><li>GraphQL schema is generated from backend GMS APIs</li></ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? 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