Polishing.

Make fields final where possible.

See #398

Author: mp911de

Diff for: src/main/java/org/springframework/data/keyvalue/repository/support/KeyValueRepositoryFactory.java

@@ -204,11 +204,11 @@ protected Optional<QueryLookupStrategy> getQueryLookupStrategy(@Nullable Key key
 	 */
 	private static class KeyValueQueryLookupStrategy implements QueryLookupStrategy {
 
-		private QueryMethodEvaluationContextProvider evaluationContextProvider;
-		private KeyValueOperations keyValueOperations;
+		private final QueryMethodEvaluationContextProvider evaluationContextProvider;
+		private final KeyValueOperations keyValueOperations;
 
-		private Class<? extends AbstractQueryCreator<?, ?>> queryCreator;
-		private Class<? extends RepositoryQuery> repositoryQueryType;
+		private final Class<? extends AbstractQueryCreator<?, ?>> queryCreator;
+		private final Class<? extends RepositoryQuery> repositoryQueryType;
 
 		/**
 		 * @param key