DATACMNS-1196 - Fixed generics lookup for nested generics in ParameterizedTypeInformation.

We now eagerly resolve a generics declaration chain, which we previously - erroneously - expected GenericTypeResolver to do for us. Simplified TypeVariableTypeInformation implementation. Renamed ParameterizedTypeUnitTests to ParameterizedTypeInformationUnitTests.

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

@@ -41,7 +41,7 @@ import org.springframework.core.GenericTypeResolver;
  * @author Mark Paluch
  */
 @RunWith(MockitoJUnitRunner.class)
-public class ParameterizedTypeUnitTests {
+public class ParameterizedTypeInformationUnitTests {
 
 	@Mock ParameterizedType one;
 	Class<?> resolvedOne;
@@ -96,7 +96,7 @@ public class ParameterizedTypeUnitTests {
 	public void createsToStringRepresentation() {
 
 		assertThat(from(Foo.class).getProperty("param").toString())
-				.isEqualTo("org.springframework.data.util.ParameterizedTypeUnitTests$Localized<java.lang.String>");
+				.isEqualTo("org.springframework.data.util.ParameterizedTypeInformationUnitTests$Localized<java.lang.String>");
 	}
 
 	@Test // DATACMNS-485
@@ -147,6 +147,14 @@ public class ParameterizedTypeUnitTests {
 		assertThat(componentType.getType()).isEqualTo(Responsibility.class);
 	}
 
+	@Test // DATACMNS-1196
+	public void detectsNestedGenerics() {
+
+		TypeInformation<?> myList = ClassTypeInformation.from(EnumGeneric.class).getRequiredProperty("inner.myList");
+
+		assertThat(myList.getRequiredComponentType().getType()).isEqualTo(MyEnum.class);
+	}
+
 	@SuppressWarnings("serial")
 	class Localized<S> extends HashMap<Locale, S> {
 		S value;
@@ -212,4 +220,21 @@ public class ParameterizedTypeUnitTests {
 	class Candidate {
 		CandidateInfoContainer<Experience> experiences;
 	}
+
+	// FOO
+
+	static abstract class Generic<T> {
+
+		Inner<T> inner;
+
+		static class Inner<T> {
+			List<T> myList;
+		}
+	}
+
+	static class EnumGeneric extends Generic<MyEnum> {}
+
+	public enum MyEnum {
+		E1, E2
+	}
 }