Fix unused type compiler warnings

spring-oxm/src/test/java/org/springframework/oxm/jaxb/Jaxb2MarshallerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 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.
@@ -311,10 +311,12 @@ public class Jaxb2MarshallerTests extends AbstractMarshallerTests {
 		private String s = "Hello";
 	}
 
+	@SuppressWarnings("unused")
 	private JAXBElement<DummyRootElement> createDummyRootElement() {
 		return null;
 	}
 
+	@SuppressWarnings("unused")
 	private JAXBElement<DummyType> createDummyType() {
 		return null;
 	}