Fix build warnings

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/function/package-info.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018 the original author or authors.
+ * Copyright 2018-2019 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.
@@ -15,7 +15,7 @@
  */
 
 /**
- * Adapters for {@link java.util.function} components.
+ * Adapters for {@code java.util.function} components.
  *
  * @author Mahmoud Ben Hassine
  */

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/builder/CompositeItemWriterBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2018 the original author or authors.
+ * Copyright 2017-2019 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.
@@ -28,6 +28,7 @@ import org.springframework.util.Assert;
  *
  * @author Glenn Renfro
  * @author Drummond Dawson
+ * @author Mahmoud Ben Hassine
  * @since 4.0
  */
 public class CompositeItemWriterBuilder<T> {
@@ -72,13 +73,14 @@ public class CompositeItemWriterBuilder<T> {
 	 * The item writers to use as delegates. Items are written to each of the
 	 * delegates.
 	 *
-	 * @param delegates the delegates to use. The delegates list must not be null
-	 * nor be empty.
+	 * @param delegates the delegates to use.
 	 * @return this instance for method chaining.
 	 *
 	 * @see CompositeItemWriter#setDelegates(List)
 	 */
-	public CompositeItemWriterBuilder<T> delegates(ItemWriter<? super T>... delegates) {
+	@SafeVarargs
+	@SuppressWarnings("varargs")
+	public final CompositeItemWriterBuilder<T> delegates(ItemWriter<? super T>... delegates) {
 		return delegates(Arrays.asList(delegates));
 	}