Fix regression in spring-scheduling span name (#5436)

instrumentation/spring/spring-scheduling-3.1/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/scheduling/SpringSchedulingCodeAttributesGetter.java

@@ -14,7 +14,7 @@ public class SpringSchedulingCodeAttributesGetter implements CodeAttributesGette
   public Class<?> codeClass(Runnable runnable) {
     if (runnable instanceof ScheduledMethodRunnable) {
       ScheduledMethodRunnable scheduledMethodRunnable = (ScheduledMethodRunnable) runnable;
-      return scheduledMethodRunnable.getTarget().getClass();
+      return scheduledMethodRunnable.getMethod().getDeclaringClass();
     } else {
       return runnable.getClass();
     }

instrumentation/spring/spring-scheduling-3.1/javaagent/src/test/groovy/SpringSchedulingTest.groovy

@@ -6,6 +6,7 @@
 import io.opentelemetry.instrumentation.test.AgentInstrumentationSpecification
 import org.springframework.context.annotation.AnnotationConfigApplicationContext
 
+import java.util.concurrent.CountDownLatch
 import java.util.concurrent.TimeUnit
 
 class SpringSchedulingTest extends AgentInstrumentationSpecification {
@@ -54,7 +55,6 @@ class SpringSchedulingTest extends AgentInstrumentationSpecification {
         }
       }
     }
-
   }
 
   def "schedule lambda test"() {
@@ -81,4 +81,28 @@ class SpringSchedulingTest extends AgentInstrumentationSpecification {
     cleanup:
     context.close()
   }
+
+  // by putting the scheduled method directly on the TaskConfig, this verifies the case where the
+  // class is enhanced and so has a different class name, e.g. TaskConfig$$EnhancerByCGLIB$$b910c4a9
+  def "schedule enhanced class test"() {
+    setup:
+    def context = new AnnotationConfigApplicationContext(EnhancedClassTaskConfig)
+    def latch = context.getBean(CountDownLatch)
+
+    latch.await(5, TimeUnit.SECONDS)
+
+    expect:
+    assertTraces(1) {
+      trace(0, 1) {
+        span(0) {
+          name "EnhancedClassTaskConfig.run"
+          hasNoParent()
+          attributes {
+            "code.namespace" "EnhancedClassTaskConfig"
+            "code.function" "run"
+          }
+        }
+      }
+    }
+  }
 }

instrumentation/spring/spring-scheduling-3.1/javaagent/src/test/java/EnhancedClassTaskConfig.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import java.util.concurrent.CountDownLatch;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.scheduling.annotation.Scheduled;
+
+@Configuration
+@EnableScheduling
+public class EnhancedClassTaskConfig {
+
+  private final CountDownLatch latch = new CountDownLatch(1);
+
+  @Scheduled(fixedRate = 5000)
+  public void run() {
+    latch.countDown();
+  }
+
+  @Bean
+  public CountDownLatch countDownLatch() {
+    return latch;
+  }
+}