SPR-7047 - XML MarshallingView assumes non-null value for object to be marshalled.

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/view/xml/MarshallingView.java

@@ -132,7 +132,7 @@ public class MarshallingView extends AbstractView {
 			return o;
 		}
 		for (Object o : model.values()) {
-			if (this.marshaller.supports(o.getClass())) {
+			if (o != null && this.marshaller.supports(o.getClass())) {
 				return o;
 			}
 		}

org.springframework.web.servlet/src/test/java/org/springframework/web/servlet/view/xml/MarshallingViewTests.java

@@ -94,6 +94,27 @@ public class MarshallingViewTests {
 		verify(marshallerMock);
 	}
 
+	@Test
+	public void renderNullModelValue() throws Exception {
+		String modelKey = "key";
+		Map model = new HashMap();
+		model.put(modelKey, null);
+
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		MockHttpServletResponse response = new MockHttpServletResponse();
+
+		replay(marshallerMock);
+		try {
+			view.render(model, request, response);
+			fail("ServletException expected");
+		}
+		catch (ServletException ex) {
+			// expected
+		}
+		assertEquals("Invalid content length", 0, response.getContentLength());
+		verify(marshallerMock);
+	}
+
 	@Test
 	public void renderModelKeyUnsupported() throws Exception {
 		Object toBeMarshalled = new Object();