Fix spring-ai-1.x-plugin dropping the trace when stream() fails synchronously

CHANGES.md

@@ -5,6 +5,9 @@ Release Notes.
 9.8.0
 ------------------
 
+* Fix the `spring-ai-1.x-plugin` `ChatModelStreamInterceptor` leaking its async span when
+  `ChatModel#stream(Prompt)` fails synchronously, which silently dropped the whole `TraceSegment`
+  of the request (apache/skywalking#14098).
 * Fix `jedis-4.x-plugin`'s `AbstractConnectionInterceptor` double-stopping the span stack on any
   Redis-level exception (or a null dynamic field on a pooled/recycled `Connection`), which corrupted
   the parent trace for the rest of the request (apache/skywalking#14085).

apm-sniffer/apm-sdk-plugin/spring-plugins/spring-ai-1.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/ai/v1/ChatModelStreamInterceptor.java

@@ -83,6 +83,11 @@ public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allA
             return ret;
         }
 
+        if (!(ret instanceof Flux)) {
+            ContextManager.stopSpan();
+            return ret;
+        }
+
         final AbstractSpan span = ContextManager.activeSpan();
         final ContextSnapshot snapshot = ContextManager.capture();