Use array.clone() instead of manual array creation

spring-aop/src/main/java/org/springframework/aop/framework/ReflectiveMethodInvocation.java

@@ -212,8 +212,7 @@ public class ReflectiveMethodInvocation implements ProxyMethodInvocation, Clonea
 		Object[] cloneArguments = this.arguments;
 		if (this.arguments.length > 0) {
 			// Build an independent copy of the arguments array.
-			cloneArguments = new Object[this.arguments.length];
+			cloneArguments = this.arguments.clone();
-			System.arraycopy(this.arguments, 0, cloneArguments, 0, this.arguments.length);
 		}
 		return invocableClone(cloneArguments);
 	}

spring-context-support/src/main/java/org/springframework/mail/SimpleMailMessage.java

@@ -276,9 +276,7 @@ public class SimpleMailMessage implements MailMessage, Serializable {
 	}
 
 	private static String[] copy(String[] state) {
-		String[] copy = new String[state.length];
+		return state.clone();
-		System.arraycopy(state, 0, copy, 0, state.length);
-		return copy;
 	}
 
 }

spring-context/src/main/java/org/springframework/cache/interceptor/SimpleKey.java

@@ -48,8 +48,7 @@ public class SimpleKey implements Serializable {
 	 */
 	public SimpleKey(Object... elements) {
 		Assert.notNull(elements, "Elements must not be null");
-		this.params = new Object[elements.length];
+		this.params = elements.clone();
-		System.arraycopy(elements, 0, this.params, 0, elements.length);
 		this.hashCode = Arrays.deepHashCode(this.params);
 	}
 

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

@@ -206,9 +206,7 @@ public class FastByteArrayOutputStream extends OutputStream {
 	 */
 	public byte[] toByteArray() {
 		byte[] bytesUnsafe = toByteArrayUnsafe();
-		byte[] ret = new byte[bytesUnsafe.length];
+		return bytesUnsafe.clone();
-		System.arraycopy(bytesUnsafe, 0, ret, 0, bytesUnsafe.length);
-		return ret;
 	}
 
 	/**