Adapt to Task and ScheduledTask changes in Framework

Spring Framework wraps `Task` and `ScheduledTask` runnables to collect
and share metadata about task execution and scheduling.
The `ScheduledTasksEndpoint` descriptors were relying on the fact that
tasks would never be wrapped. Spring Framework already wrapped runnables
in various cases, for methods returning `Callable` or reactive types.

This commit makes use of the `toString()` method to describe the
runnable. Runnable implementations can override this method for
displaying purposes on the actuator endpoint.

See spring-projects/spring-framework#24560

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/scheduling/ScheduledTasksEndpoint.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,6 @@
 
 package org.springframework.boot.actuate.scheduling;
 
-import java.lang.reflect.Method;
 import java.time.Duration;
 import java.util.Collection;
 import java.util.Collections;
@@ -46,7 +45,6 @@
 import org.springframework.scheduling.config.TriggerTask;
 import org.springframework.scheduling.support.CronTrigger;
 import org.springframework.scheduling.support.PeriodicTrigger;
-import org.springframework.scheduling.support.ScheduledMethodRunnable;
 
 /**
  * {@link Endpoint @Endpoint} to expose information about an application's scheduled
@@ -284,13 +282,7 @@ public static final class RunnableDescriptor {
 		private final String target;
 
 		private RunnableDescriptor(Runnable runnable) {
-			if (runnable instanceof ScheduledMethodRunnable scheduledMethodRunnable) {
-				Method method = scheduledMethodRunnable.getMethod();
-				this.target = method.getDeclaringClass().getName() + "." + method.getName();
-			}
-			else {
-				this.target = runnable.getClass().getName();
-			}
+			this.target = runnable.toString();
 		}
 
 		public String getTarget() {

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/scheduling/ScheduledTasksEndpointTests.java

@@ -80,7 +80,7 @@ void cronTriggerIsReported() {
 			assertThat(tasks.getCron()).hasSize(1);
 			CronTaskDescriptor description = (CronTaskDescriptor) tasks.getCron().get(0);
 			assertThat(description.getExpression()).isEqualTo("0 0 0/6 1/1 * ?");
-			assertThat(description.getRunnable().getTarget()).isEqualTo(CronTriggerRunnable.class.getName());
+			assertThat(description.getRunnable().getTarget()).contains(CronTriggerRunnable.class.getName());
 		});
 	}
 
@@ -109,7 +109,7 @@ void fixedDelayTriggerIsReported() {
 			FixedDelayTaskDescriptor description = (FixedDelayTaskDescriptor) tasks.getFixedDelay().get(0);
 			assertThat(description.getInitialDelay()).isEqualTo(2000);
 			assertThat(description.getInterval()).isEqualTo(1000);
-			assertThat(description.getRunnable().getTarget()).isEqualTo(FixedDelayTriggerRunnable.class.getName());
+			assertThat(description.getRunnable().getTarget()).contains(FixedDelayTriggerRunnable.class.getName());
 		});
 	}
 
@@ -123,7 +123,7 @@ void noInitialDelayFixedDelayTriggerIsReported() {
 			FixedDelayTaskDescriptor description = (FixedDelayTaskDescriptor) tasks.getFixedDelay().get(0);
 			assertThat(description.getInitialDelay()).isEqualTo(0);
 			assertThat(description.getInterval()).isEqualTo(1000);
-			assertThat(description.getRunnable().getTarget()).isEqualTo(FixedDelayTriggerRunnable.class.getName());
+			assertThat(description.getRunnable().getTarget()).contains(FixedDelayTriggerRunnable.class.getName());
 		});
 	}
 
@@ -152,7 +152,7 @@ void fixedRateTriggerIsReported() {
 			FixedRateTaskDescriptor description = (FixedRateTaskDescriptor) tasks.getFixedRate().get(0);
 			assertThat(description.getInitialDelay()).isEqualTo(3000);
 			assertThat(description.getInterval()).isEqualTo(2000);
-			assertThat(description.getRunnable().getTarget()).isEqualTo(FixedRateTriggerRunnable.class.getName());
+			assertThat(description.getRunnable().getTarget()).contains(FixedRateTriggerRunnable.class.getName());
 		});
 	}
 
@@ -166,7 +166,7 @@ void noInitialDelayFixedRateTriggerIsReported() {
 			FixedRateTaskDescriptor description = (FixedRateTaskDescriptor) tasks.getFixedRate().get(0);
 			assertThat(description.getInitialDelay()).isEqualTo(0);
 			assertThat(description.getInterval()).isEqualTo(2000);
-			assertThat(description.getRunnable().getTarget()).isEqualTo(FixedRateTriggerRunnable.class.getName());
+			assertThat(description.getRunnable().getTarget()).contains(FixedRateTriggerRunnable.class.getName());
 		});
 	}
 
@@ -178,7 +178,7 @@ void taskWithCustomTriggerIsReported() {
 			assertThat(tasks.getFixedRate()).isEmpty();
 			assertThat(tasks.getCustom()).hasSize(1);
 			CustomTriggerTaskDescriptor description = (CustomTriggerTaskDescriptor) tasks.getCustom().get(0);
-			assertThat(description.getRunnable().getTarget()).isEqualTo(CustomTriggerRunnable.class.getName());
+			assertThat(description.getRunnable().getTarget()).contains(CustomTriggerRunnable.class.getName());
 			assertThat(description.getTrigger()).isEqualTo(CustomTriggerTask.trigger.toString());
 		});
 	}