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-xml/src/main/java/org/springframework/integration/xml/splitter/XPathMessageSplitter.java

@@ -269,7 +269,7 @@ public class XPathMessageSplitter extends AbstractMessageSplitter {
 		}
 	}
 
-	private class NodeListIterator implements Iterator<Node> {
+	private final class NodeListIterator implements Iterator<Node> {
 
 		private final DocumentBuilder documentBuilder;