Consistent use of ClassUtils.toClassArray (and related polishing)

spring-test/src/main/java/org/springframework/test/context/support/AnnotationConfigContextLoaderUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -27,6 +27,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.test.context.SmartContextLoader;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 
 /**
  * Utility methods for {@link SmartContextLoader SmartContextLoaders} that deal
@@ -84,7 +85,7 @@ public abstract class AnnotationConfigContextLoaderUtils {
 			}
 		}
 
-		return configClasses.toArray(new Class<?>[configClasses.size()]);
+		return ClassUtils.toClassArray(configClasses);
 	}
 
 	/**