SPR-8986 Add the ability to Scan Packages for JAXB Marshalling

Jaxb2Marshaller now has the capability to scan for classes annotated with JAXB2 annotations.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -279,6 +279,13 @@ public class Jaxb2MarshallerTests extends AbstractMarshallerTests {
 		assertTrue("No XML written", writer.toString().length() > 0);
 	}
 
+	@Test
+	public void supportsPackagesToScan() throws Exception {
+		marshaller = new Jaxb2Marshaller();
+		marshaller.setPackagesToScan(new String[] {CONTEXT_PATH});
+		marshaller.afterPropertiesSet();
+	}
+
 	@XmlRootElement
 	public static class DummyRootElement {