Fix compatibility with latest Spring AMQP

spring-integration-amqp/src/test/java/org/springframework/integration/amqp/channel/ChannelTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2022 the original author or authors.
+ * Copyright 2014-2023 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.
@@ -20,6 +20,7 @@ import java.util.Collection;
 import java.util.Set;
 import java.util.concurrent.CyclicBarrier;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.Lock;
 
 import org.junit.After;
 import org.junit.ClassRule;
@@ -134,19 +135,23 @@ public class ChannelTests {
 	private void waitForNewConsumer(PublishSubscribeAmqpChannel channel, BlockingQueueConsumer consumer)
 			throws Exception {
 
-		final Object consumersMonitor = TestUtils.getPropertyValue(channel, "container.consumersMonitor");
+		Lock consumersLock = TestUtils.getPropertyValue(channel, "container.consumersLock", Lock.class);
 		int n = 0;
 		while (n++ < 100) {
 			Set<BlockingQueueConsumer> consumers = TestUtils
 					.getPropertyValue(channel, "container.consumers", Set.class);
-			synchronized (consumersMonitor) {
+			consumersLock.lock();
+			try {
 				if (!consumers.isEmpty()) {
 					BlockingQueueConsumer newConsumer = consumers.iterator().next();
-					if (newConsumer != consumer && newConsumer.getConsumerTags().size() > 0) {
+					if (newConsumer != consumer && !newConsumer.getConsumerTags().isEmpty()) {
 						break;
 					}
 				}
 			}
+			finally {
+				consumersLock.unlock();
+			}
 			Thread.sleep(100);
 		}
 		assertThat(n < 100).as("Failed to restart consumer").isTrue();