DATACMNS-422 - Mitigate semantic changes in Spring 4.0's GenericTypeResolver.

In case of an unresolvable generic parameter in TypeDiscoverer's getTypeArgument(…) we check for a generic super type for the given bound and fall back to Object in case we find a parameterized type.

src/test/java/org/springframework/data/util/ClassTypeInformationUnitTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2013 the original author or authors.
+ * Copyright 2011-2014 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.
@@ -294,6 +294,16 @@ public class ClassTypeInformationUnitTests {
 		from(null);
 	}
 
+	/**
+	 * @see DATACMNS-422
+	 */
+	@Test
+	public void returnsNullForRawTypesOnly() {
+
+		assertThat(from(MyRawIterable.class).getComponentType(), is(nullValue()));
+		assertThat(from(MyIterable.class).getComponentType(), is(notNullValue()));
+	}
+
 	static class StringMapContainer extends MapContainer<String> {
 
 	}
@@ -418,4 +428,9 @@ public class ClassTypeInformationUnitTests {
 	interface Identifiable {
 		Long getId();
 	}
+
+	@SuppressWarnings("rawtypes")
+	interface MyRawIterable extends Iterable {}
+
+	interface MyIterable<T> extends Iterable<T> {}
 }