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-syslog/src/main/java/org/springframework/integration/syslog/SyslogHeaders.java

@@ -25,7 +25,7 @@ import org.springframework.integration.transformer.SyslogToMapTransformer;
  * @since 3.0
  *
  */
-public class SyslogHeaders {
+public final class SyslogHeaders {
 
 	private SyslogHeaders() {
 		super();