chore: import upstream snapshot with attribution
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wehub-resource-sync
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<!--
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name: 'Data: Claude API reference — Java'
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description: Java SDK reference including installation, client initialization, basic requests, streaming, and beta tool use
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ccVersion: 2.1.182
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-->
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# Claude API — Java
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> **Note:** The Java SDK supports the Claude API and beta tool use with annotated classes. Agent SDK is not yet available for Java.
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## Package Reference
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Types are organized by package. If a class you need isn't shown in an example below, locate it via this table first — don't block on fetching SDK source over the network.
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| `import` prefix | Contains |
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|---|---|
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| `com.anthropic.client` / `com.anthropic.client.okhttp` | `AnthropicClient`, `AnthropicOkHttpClient` |
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| `com.anthropic.models.messages` | non-beta request/response types — `MessageCreateParams`, `Model`, `Message`, `TextBlockParam`, `ContentBlockParam`, `ToolUseBlockParam`, `ToolResultBlockParam`, `CacheControlEphemeral`, `Tool*` (e.g. `ToolBash20250124`, `ToolTextEditor20250728`), `StopReason`, `StructuredMessage*` |
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| `com.anthropic.models.messages.batches` | Batch API — `BatchResultsParams`, `MessageBatchIndividualResponse` |
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| `com.anthropic.models.beta` | `AnthropicBeta` (beta-flag constants) |
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| `com.anthropic.models.beta.messages` | beta-endpoint types — `MessageCreateParams`, `BetaMessage`, `BetaStopReason`, `BetaContextManagementConfig`, `BetaMcpToolset`, `BetaRequestMcpServerUrlDefinition`, `BetaTool*` |
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| `com.anthropic.core` | `JsonValue`, `JsonField`, `JsonSchemaLocalValidation`, `com.anthropic.core.http.StreamResponse` |
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| `com.anthropic.errors` | typed exceptions — `AnthropicServiceException`, `RateLimitException`, `NotFoundException`, etc. (see `shared/error-codes.md`) |
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`client.messages()` uses `com.anthropic.models.messages.*`; `client.beta().messages()` uses `com.anthropic.models.beta.messages.*`. Both packages define a `MessageCreateParams` — import the one matching the client path you call.
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### Key types per feature
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Write from this table instead of `javap`/jar inspection. Endpoint column tells you whether to use `client.messages()` or `client.beta().messages()`.
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| Feature | Endpoint | Key Java types / builder calls |
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|---|---|---|
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| User profiles | beta | `client.beta().userProfiles().create(...)` / `.retrieve(id)` / `.list()`. Pass the returned profile id on the beta `MessageCreateParams`. Requires a beta header — check the SDK's beta-headers reference for the current flag. |
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| Agent Skills | beta | `BetaContainerParams`, `BetaSkillParams`, `BetaCodeExecutionTool20250825`. `.addBeta("code-execution-2025-08-25").addBeta("skills-2025-10-02")`. Download the output via `client.beta().files().download(fileId)`. |
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| Cache diagnostics | beta | `BetaDiagnosticsParam`, `BetaCacheControlEphemeral` |
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| Context editing | beta | `.contextManagement(BetaContextManagementConfig.builder()…)`. The edit strategy is a `BetaClearToolUses20250919Edit` (or `BetaClearThinking20251015Edit`); its trigger is a `BetaInputTokensTrigger` built separately and passed to the edit's builder — there is no direct `.inputTokensTrigger(N)` shortcut on the edit builder. `javap` the edit and trigger classes for the exact setter names. |
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| Memory tool | non-beta | `.addTool(MemoryTool20250818.builder().build())` from `com.anthropic.models.messages` |
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| Programmatic tool calling | non-beta | `CodeExecutionTool20260120`, `Tool`, `ContentBlockParam` |
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| Strict tool use | non-beta | `Tool`, `Tool.InputSchema` |
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| Task budgets | beta | `.outputConfig(BetaOutputConfig.builder().taskBudget(BetaTokenTaskBudget.builder()...))` |
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| Tool search | non-beta | `.addTool(ToolSearchToolRegex20251119.builder()...)` from `com.anthropic.models.messages` |
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| Web search | non-beta | `WebSearchTool20260209` from `com.anthropic.models.messages` — the latest variant with dynamic filtering (Opus 4.8/4.7/4.6 + Sonnet 4.6). For older models or Vertex, use `WebSearchTool20250305` |
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### Discovering type and member names
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If a class or builder method you need isn't in the tables above, `jar tf <anthropic-java-core jar> | grep -i <term>` or `javap -classpath <jar> com.anthropic.models.…` is fast enough to locate names. **Do not compile and run a separate reflection program** to enumerate members — the first build is slow enough to be backgrounded in many environments, trapping you in a polling loop. Write the script with the names you found and let the compiler error (`cannot find symbol`) point at any wrong member.
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## Installation
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Maven:
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```xml
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<dependency>
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<groupId>com.anthropic</groupId>
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<artifactId>anthropic-java</artifactId>
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<version>2.34.0</version>
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</dependency>
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```
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Gradle:
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```groovy
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implementation("com.anthropic:anthropic-java:2.34.0")
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```
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## Client Initialization
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```java
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import com.anthropic.client.AnthropicClient;
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import com.anthropic.client.okhttp.AnthropicOkHttpClient;
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// Default (reads ANTHROPIC_API_KEY from environment)
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AnthropicClient client = AnthropicOkHttpClient.fromEnv();
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// Explicit API key
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AnthropicClient client = AnthropicOkHttpClient.builder()
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.apiKey("your-api-key")
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.build();
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```
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---
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## Basic Message Request
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```java
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import com.anthropic.models.messages.MessageCreateParams;
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import com.anthropic.models.messages.Message;
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import com.anthropic.models.messages.Model;
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MessageCreateParams params = MessageCreateParams.builder()
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.model(Model.CLAUDE_OPUS_4_8)
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.maxTokens(16000L)
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.addUserMessage("What is the capital of France?")
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.build();
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Message response = client.messages().create(params);
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response.content().stream()
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.flatMap(block -> block.text().stream())
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.forEach(textBlock -> System.out.println(textBlock.text()));
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```
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---
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## Thinking
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**Adaptive thinking is the recommended mode for Claude 4.6+ models.** Claude decides dynamically when and how much to think. The builder has a direct `.thinking(ThinkingConfigAdaptive)` overload — no manual union wrapping.
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> **Fable 5, Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6:** Use adaptive thinking (below). `ThinkingConfigEnabled.builder().budgetTokens(N)` is removed on Fable 5, Opus 4.8, and 4.7 (400 if sent); deprecated on Opus 4.6 and Sonnet 4.6.
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> **Older models:** Use `.thinking(ThinkingConfigEnabled.builder().budgetTokens(N).build())` (budget must be < `maxTokens`, min 1024).
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```java
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import com.anthropic.models.messages.ContentBlock;
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import com.anthropic.models.messages.MessageCreateParams;
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import com.anthropic.models.messages.Model;
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import com.anthropic.models.messages.ThinkingConfigAdaptive;
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MessageCreateParams params = MessageCreateParams.builder()
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.model(Model.CLAUDE_SONNET_4_6)
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.maxTokens(16000L)
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.thinking(ThinkingConfigAdaptive.builder().build())
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.addUserMessage("Solve this step by step: 27 * 453")
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.build();
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for (ContentBlock block : client.messages().create(params).content()) {
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block.thinking().ifPresent(t -> System.out.println("[thinking] " + t.thinking()));
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block.text().ifPresent(t -> System.out.println(t.text()));
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}
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```
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`ContentBlock` narrowing: `.thinking()` / `.text()` return `Optional<T>` — use `.ifPresent(...)` or `.stream().flatMap(...)`. Alternative: `isThinking()` / `asThinking()` boolean+unwrap pairs (throws on wrong variant).
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---
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## Effort Parameter
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Effort is nested inside `OutputConfig` — there is NO `.effort()` directly on `MessageCreateParams.Builder`.
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```java
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import com.anthropic.models.messages.OutputConfig;
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.outputConfig(OutputConfig.builder()
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.effort(OutputConfig.Effort.HIGH) // or LOW, MEDIUM, MAX
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.build())
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```
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Combine with `Thinking = ThinkingConfigAdaptive` for cost-quality control.
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---
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## Prompt Caching
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System message as a list of `TextBlockParam` with `CacheControlEphemeral`. Use `.systemOfTextBlockParams(...)` — the plain `.system(String)` overload can't carry cache control. For placement patterns and the silent-invalidator audit checklist, see `shared/prompt-caching.md`.
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```java
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import com.anthropic.models.messages.TextBlockParam;
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import com.anthropic.models.messages.CacheControlEphemeral;
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.systemOfTextBlockParams(List.of(
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TextBlockParam.builder()
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.text(longSystemPrompt)
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.cacheControl(CacheControlEphemeral.builder()
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.ttl(CacheControlEphemeral.Ttl.TTL_1H) // optional; also TTL_5M
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.build())
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.build()))
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```
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There's also a top-level `.cacheControl(CacheControlEphemeral)` on `MessageCreateParams.Builder` and on `Tool.builder()`.
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Verify hits via `response.usage().cacheCreationInputTokens()` / `response.usage().cacheReadInputTokens()`.
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---
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## Token Counting
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```java
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import com.anthropic.models.messages.MessageCountTokensParams;
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long tokens = client.messages().countTokens(
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MessageCountTokensParams.builder()
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.model(Model.CLAUDE_SONNET_4_6)
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.addUserMessage("Hello")
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.build()
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).inputTokens();
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```
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---
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## PDF / Document Input
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`DocumentBlockParam` builder has source shortcuts. Wrap in `ContentBlockParam.ofDocument()` and pass via `.addUserMessageOfBlockParams()`.
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```java
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import com.anthropic.models.messages.DocumentBlockParam;
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import com.anthropic.models.messages.ContentBlockParam;
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import com.anthropic.models.messages.TextBlockParam;
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DocumentBlockParam doc = DocumentBlockParam.builder()
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.source(Base64PdfSource.builder().data(base64String).build())
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// or .source(UrlPdfSource.builder().url("https://...").build())
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.title("My Document") // optional
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.build();
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```
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For **Files API** document references, use the beta path and beta types — see `files-api.md`: `BetaRequestDocumentBlock.builder().source(BetaFileDocumentSource.builder().fileId(id).build())`.
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```java
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.addUserMessageOfBlockParams(List.of(
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ContentBlockParam.ofDocument(doc),
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ContentBlockParam.ofText(TextBlockParam.builder().text("Summarize this").build())))
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```
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---
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## Stop Details
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When `stopReason()` is `"refusal"`, the response includes structured `stopDetails()`:
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```java
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response.stopDetails().ifPresent(details -> {
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System.out.println("Category: " + details.category());
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System.out.println("Explanation: " + details.explanation());
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});
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```
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**Refusal fallbacks ({{FABLE_NAME}}) — opt in by default.** Fallbacks are opt-in: without them a refused request simply stops. New `{{FABLE_ID}}` code should include the server-side `fallbacks` parameter (beta header `server-side-fallback-2026-06-01`, fallback model `{{OPUS_ID}}`, on the beta messages call) by default. The exact Java builder methods (and the client-side middleware for providers without server-side support) are not documented here — WebFetch the Java SDK repo's `examples/` from `shared/live-sources.md`; full semantics in `shared/model-migration.md` → Migrating to {{FABLE_NAME}} → `refusal` stop reason.
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---
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## Error Type
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`AnthropicServiceException` exposes `.errorType()` returning `Optional<ErrorType>` for programmatic error classification:
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```java
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try {
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client.messages().create(params);
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} catch (AnthropicServiceException e) {
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e.errorType().ifPresent(type ->
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System.out.println("Error type: " + type) // RATE_LIMIT_ERROR, OVERLOADED_ERROR, etc.
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);
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}
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```
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---
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Reference in New Issue
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