Consistent Lock field declaration (instead of ReentrantLock field type)

(cherry picked from commit b415361)

spring-context/src/main/java/org/springframework/context/support/ReloadableResourceBundleMessageSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -27,6 +27,7 @@
 import java.util.Properties;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 
 import org.springframework.context.ResourceLoaderAware;
@@ -400,7 +401,7 @@ protected PropertiesHolder getProperties(String filename) {
 
 	/**
 	 * Refresh the PropertiesHolder for the given bundle filename.
-	 * The holder can be {@code null} if not cached before, or a timed-out cache entry
+	 * <p>The holder can be {@code null} if not cached before, or a timed-out cache entry
 	 * (potentially getting re-validated against the current last-modified timestamp).
 	 * @param filename the bundle filename (basename + Locale)
 	 * @param propHolder the current PropertiesHolder for the bundle
@@ -561,7 +562,7 @@ protected class PropertiesHolder {
 
 		private volatile long refreshTimestamp = -2;
 
-		private final ReentrantLock refreshLock = new ReentrantLock();
+		private final Lock refreshLock = new ReentrantLock();
 
 		/** Cache to hold already generated MessageFormats per message code. */
 		private final ConcurrentMap<String, Map<Locale, MessageFormat>> cachedMessageFormats =

spring-web/src/main/java/org/springframework/web/server/session/InMemoryWebSessionStore.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -26,6 +26,7 @@
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 
 import reactor.core.publisher.Mono;
@@ -315,12 +316,10 @@ private class ExpiredSessionChecker {
 		/** Max time between expiration checks. */
 		private static final int CHECK_PERIOD = 60 * 1000;
 
-
-		private final ReentrantLock lock = new ReentrantLock();
+		private final Lock lock = new ReentrantLock();
 
 		private Instant checkTime = clock.instant().plus(CHECK_PERIOD, ChronoUnit.MILLIS);
 
-
 		public void checkIfNecessary(Instant now) {
 			if (this.checkTime.isBefore(now)) {
 				removeExpiredSessions(now);

spring-websocket/src/main/java/org/springframework/web/socket/messaging/SubProtocolWebSocketHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -25,6 +25,7 @@
 import java.util.TreeMap;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 
 import org.apache.commons.logging.Log;
@@ -98,7 +99,7 @@ public class SubProtocolWebSocketHandler
 
 	private volatile long lastSessionCheckTime = System.currentTimeMillis();
 
-	private final ReentrantLock sessionCheckLock = new ReentrantLock();
+	private final Lock sessionCheckLock = new ReentrantLock();
 
 	private final DefaultStats stats = new DefaultStats();