Consistent declaration of private static final logger variables

Issue: SPR-11905

spring-context/src/main/java/org/springframework/validation/ValidationUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -38,7 +38,7 @@ import org.springframework.util.StringUtils;
  */
 public abstract class ValidationUtils {
 
-	private static Log logger = LogFactory.getLog(ValidationUtils.class);
+	private static final Log logger = LogFactory.getLog(ValidationUtils.class);
 
 
 	/**