feat(cloud-sdk): Spring AI + LangChain4j auto-instrumentation + Spring Boot starter (Phase 1.8 + 1.9)

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README.md

@@ -112,6 +112,57 @@ That is the entire integration. No schema changes, no new infrastructure.
 | `jamjet-runtime-plugins` | ClassLoader-isolated plugin system with ServiceLoader and hot-reload |
 | `jamjet-runtime-server` | Standalone Javalin REST server — same API surface as the Rust runtime |
 | `jamjet-spring-boot-starter` | Spring Boot auto-configuration: embeds the runtime as Spring beans |
+| `jamjet-cloud-sdk` | Drop-in observability for Spring AI / LangChain4j (mirrors Python `jamjet.cloud`) |
+| `jamjet-cloud-spring-boot-starter` | Spring Boot auto-config for the Cloud SDK |
+
+---
+
+## JamJet Cloud SDK
+
+Drop-in observability for Spring AI and LangChain4j agents. Mirrors the Python `jamjet.cloud` SDK.
+
+### Spring Boot
+
+```xml
+<dependency>
+  <groupId>dev.jamjet</groupId>
+  <artifactId>jamjet-cloud-spring-boot-starter</artifactId>
+  <version>0.2.0</version>
+</dependency>
+```
+
+```yaml
+# application.yml
+jamjet:
+  cloud:
+    api-key: ${JJ_API_KEY}
+    project: my-app
+```
+
+That's it. Every Spring AI `ChatClient` / `ChatModel` call and every LangChain4j `ChatLanguageModel` call is captured automatically.
+
+### Plain Java (LangChain4j without Spring)
+
+```xml
+<dependency>
+  <groupId>dev.jamjet</groupId>
+  <artifactId>jamjet-cloud-sdk</artifactId>
+  <version>0.2.0</version>
+</dependency>
+```
+
+```java
+JamjetCloud.configure(JamjetCloudConfig.builder()
+    .apiKey(System.getenv("JJ_API_KEY"))
+    .project("my-app")
+    .build());
+
+var model = OpenAiChatModel.builder()
+    .apiKey(System.getenv("OPENAI_API_KEY"))
+    .modelName("gpt-4o-mini")
+    .listeners(List.of(new JamjetChatModelListener()))
+    .build();
+```
 
 ---
 

jamjet-cloud-sdk/pom.xml

@@ -7,7 +7,7 @@
     <parent>
         <groupId>dev.jamjet</groupId>
         <artifactId>jamjet-runtime-java-parent</artifactId>
-        <version>0.1.1</version>
+        <version>0.2.0</version>
     </parent>
 
     <artifactId>jamjet-cloud-sdk</artifactId>
@@ -35,11 +35,50 @@
             <artifactId>slf4j-api</artifactId>
         </dependency>
 
+        <!-- Micrometer: optional, only needed if user is on Spring AI. -->
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-observation</artifactId>
+            <version>1.13.6</version>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- LangChain4j: optional, only needed if user is on LangChain4j. -->
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-core</artifactId>
+            <version>0.36.2</version>
+            <optional>true</optional>
+        </dependency>
+
         <!-- Test scope -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>dev.langchain4j</groupId>
+            <artifactId>langchain4j-open-ai</artifactId>
+            <version>0.36.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.wiremock</groupId>
+            <artifactId>wiremock-standalone</artifactId>
+            <version>3.9.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.awaitility</groupId>
+            <artifactId>awaitility</artifactId>
+            <version>4.2.2</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>

jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/FailureModeClassifier.java

@@ -0,0 +1,43 @@
+package dev.jamjet.cloud;
+
+import java.net.SocketTimeoutException;
+import java.net.http.HttpTimeoutException;
+import java.time.Duration;
+import java.util.regex.Pattern;
+
+/**
+ * Maps a Throwable to a string failure_mode that matches the cloud's
+ * events_failure_mode_check constraint and the Python SDK enum.
+ *
+ * <p>Cross-SDK contract: same string values for rate_limit, auth, timeout,
+ * bad_request, server_error, unknown.
+ */
+public final class FailureModeClassifier {
+
+    private static final Pattern STATUS_4XX_5XX = Pattern.compile("(?i)\\b(?:HTTP\\s+|status(?:\\s+code)?\\s*:?\\s*)?([45]\\d{2})\\b");
+
+    private FailureModeClassifier() {}
+
+    public static String classify(Throwable t) {
+        return classify(t, null);
+    }
+
+    public static String classify(Throwable t, Duration ignored) {
+        if (t == null) return "unknown";
+        if (t instanceof SocketTimeoutException || t instanceof HttpTimeoutException) {
+            return "timeout";
+        }
+        String msg = t.getMessage();
+        if (msg != null) {
+            var m = STATUS_4XX_5XX.matcher(msg);
+            if (m.find()) {
+                int status = Integer.parseInt(m.group(1));
+                if (status == 429) return "rate_limit";
+                if (status == 401 || status == 403) return "auth";
+                if (status >= 400 && status < 500) return "bad_request";
+                if (status >= 500) return "server_error";
+            }
+        }
+        return "unknown";
+    }
+}

jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/JamjetCloud.java

@@ -110,7 +110,8 @@ static CloudHttpClient httpClient() {
         return httpClient;
     }
 
-    static JamjetCloudConfig config() {
+    /** Public for instrumentation modules outside this package. May return null before configure(). */
+    public static JamjetCloudConfig config() {
         return config;
     }