GH-9854: Special error for "too early message production"

Fixes: https://github.com/spring-projects/spring-integration/issues/9854

The well-known `Dispatcher has no subscribers` is not very informative
when a message is produced from early application context initialization phase

* Add internal `ApplicationRunningController` bean to handle early `start()` event
* Check for this bean status from the `AbstractMessageChannel.send()`
* Throw specific `MessageDispatchingException` to indicate that the message was produced from a wrong place
* Adjust `ApplicationEventListeningMessageProducer` logic for `ContextStoppedEvent` & `ContextClosedEvent`
to indicate that `AbstractMessageChannel` bean might not dispatch a message because the application context is not running

spring-integration-event/src/test/java/org/springframework/integration/event/inbound/ApplicationEventListeningMessageProducerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -18,6 +18,9 @@ package org.springframework.integration.event.inbound;
 
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import org.junit.jupiter.api.Test;
@@ -341,13 +344,7 @@ public class ApplicationEventListeningMessageProducerTests {
 
 	}
 
-	private static class TestApplicationListener implements ApplicationListener<ApplicationEvent> {
-
-		private final AtomicInteger counter;
-
-		private TestApplicationListener(AtomicInteger counter) {
-			this.counter = counter;
-		}
+	private record TestApplicationListener(AtomicInteger counter) implements ApplicationListener<ApplicationEvent> {
 
 		@Override
 		public void onApplicationEvent(ApplicationEvent event) {
@@ -356,4 +353,35 @@ public class ApplicationEventListeningMessageProducerTests {
 
 	}
 
+	static final class ContextEventsChannel implements PollableChannel {
+
+		private final BlockingQueue<Message<?>> internalQueue = new LinkedBlockingQueue<>();
+
+		@Override
+		public Message<?> receive() {
+			return receive(-1);
+		}
+
+		@Override
+		public Message<?> receive(long timeout) {
+			try {
+				return this.internalQueue.poll(timeout, TimeUnit.MILLISECONDS);
+			}
+			catch (InterruptedException e) {
+				throw new RuntimeException(e);
+			}
+		}
+
+		@Override
+		public boolean send(Message<?> message, long timeout) {
+			try {
+				return this.internalQueue.offer(message, timeout, TimeUnit.MILLISECONDS);
+			}
+			catch (InterruptedException e) {
+				throw new RuntimeException(e);
+			}
+		}
+
+	}
+
 }

spring-integration-event/src/test/java/org/springframework/integration/event/inbound/applicationEventInboundChannelAdapterTests.xml

@@ -1,13 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/integration https://www.springframework.org/schema/integration/spring-integration.xsd"
-	xmlns:int="http://www.springframework.org/schema/integration">
+	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	   xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
-	<int:channel id="channel">
-		<int:queue capacity="5"/>
-	</int:channel>
+	<bean id="channel"
+		  class="org.springframework.integration.event.inbound.ApplicationEventListeningMessageProducerTests$ContextEventsChannel"/>
 
 	<bean id="adapter" class="org.springframework.integration.event.inbound.ApplicationEventListeningMessageProducer">
 		<property name="outputChannel" ref="channel"/>