Deprecate FileSystemUtils

Issue: SPR-15748

Author: jhoeller

spring-core/src/main/java/org/springframework/util/FileSystemUtils.java

@@ -27,7 +27,9 @@
  * @author Rob Harrop
  * @author Juergen Hoeller
  * @since 2.5.3
+ * @deprecated as of Spring Framework 5.0, in favor of native NIO API usage
  */
+@Deprecated
 public abstract class FileSystemUtils {
 
 	/**
@@ -60,7 +62,8 @@ public static boolean deleteRecursively(@Nullable File root) {
 	 * @throws IOException in the case of I/O errors
 	 */
 	public static void copyRecursively(@Nullable File src, File dest) throws IOException {
-		Assert.isTrue(src != null && (src.isDirectory() || src.isFile()), "Source File must denote a directory or file");
+		Assert.isTrue(src != null && (src.isDirectory() || src.isFile()),
+				"Source File must denote a directory or file");
 		Assert.notNull(dest, "Destination File must not be null");
 		doCopyRecursively(src, dest);
 	}
@@ -88,9 +91,7 @@ else if (src.isFile()) {
 				dest.createNewFile();
 			}
 			catch (IOException ex) {
-				IOException ioex = new IOException("Failed to create file: " + dest);
-				ioex.initCause(ex);
-				throw ioex;
+				throw new IOException("Failed to create file: " + dest, ex);
 			}
 			FileCopyUtils.copy(src, dest);
 		}

spring-core/src/test/java/org/springframework/util/FileSystemUtilsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -26,6 +26,7 @@
 /**
  * @author Rob Harrop
  */
+@Deprecated
 public class FileSystemUtilsTests {
 
 	@Test