BATCH-2397: fix parameters handling in MethodInvokingTaskletAdapter

When a tasklet is declared with xml using the shortcut version, the
MethodInvokingTaskletAdapter that is created automatically does not
address passing parameters expected by Tasklet#execute (which is
incorrect since the documentation of the schema attribute "method"
says the bean should define a method with the same signature).

This commit fixes parameters passing when using the shortcut version.

Resolves BATCH-2397

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/adapter/AbstractMethodInvokingDelegator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2013 the original author or authors.
+ * Copyright 2006-2018 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.
@@ -38,6 +38,7 @@ import org.springframework.util.MethodInvoker;
  * by {@link InvocationTargetThrowableWrapper}.
  *
  * @author Robert Kasanicky
+ * @author Mahmoud Ben Hassine
  */
 public abstract class AbstractMethodInvokingDelegator<T> implements InitializingBean {
 
@@ -213,6 +214,14 @@ public abstract class AbstractMethodInvokingDelegator<T> implements Initializing
 		this.arguments = arguments == null ? null : Arrays.asList(arguments).toArray();
 	}
 
+	/**
+	 * Return arguments.
+	 * @return arguments
+	 */
+	protected Object[] getArguments() {
+		return arguments;
+	}
+	
 	/**
 	 * Used to wrap a {@link Throwable} (not an {@link Exception}) thrown by a
 	 * reflectively-invoked delegate.