checkstyle FinalClassCheck

fixes

fixModifiers after fixFinal

Revert CachingSessionFactory

Class is spied in tests.

checkstyle - Import Rules

checkstyle InterfaceIsType

checkstyle InnerTypeLast

checkstyle OneStatementPerLine

CovariantEquals
OneTopLevelClass

* Revert `'\n'` -> `System.lineSeparator()` in the Gradle scripts to meet Git `autocrlf = true` on Windows
* Fix timing issue with the `LastModifiedFileListFilterTests`, when the `age = 1` might not be enough for the file object when we have some delay before checking

spring-integration-redis/src/main/java/org/springframework/integration/redis/support/RedisHeaders.java

@@ -25,7 +25,7 @@ package org.springframework.integration.redis.support;
  * @author Artem Bilan
  * @since 2.2
  */
-public class RedisHeaders {
+public final class RedisHeaders {
 
 	private RedisHeaders() {
 		super();

spring-integration-redis/src/main/java/org/springframework/integration/redis/util/RedisLockRegistry.java

@@ -296,7 +296,7 @@ public final class RedisLockRegistry implements LockRegistry {
 		});
 	}
 
-	private class RedisLock implements Lock {
+	private final class RedisLock implements Lock {
 
 		private final String lockKey;