Reintroduced XMLReaderFactory deprecation markers on JDK 9

Issue: SPR-14486

spring-web/src/main/java/org/springframework/http/converter/xml/Jaxb2RootElementHttpMessageConverter.java

@@ -153,6 +153,7 @@ public class Jaxb2RootElementHttpMessageConverter extends AbstractJaxb2HttpMessa
 		}
 	}
 
+	@SuppressWarnings("deprecation")  // on JDK 9
 	protected Source processSource(Source source) {
 		if (source instanceof StreamSource) {
 			StreamSource streamSource = (StreamSource) source;

spring-web/src/main/java/org/springframework/http/converter/xml/SourceHttpMessageConverter.java

@@ -187,6 +187,7 @@ public class SourceHttpMessageConverter<T extends Source> extends AbstractHttpMe
 		}
 	}
 
+	@SuppressWarnings("deprecation")  // on JDK 9
 	private SAXSource readSAXSource(InputStream body) throws IOException {
 		try {
 			XMLReader xmlReader = org.xml.sax.helpers.XMLReaderFactory.createXMLReader();