DATACMNS-854 - Allow custom implementation of repository methods with generics.

Add additional check for detecting customized method where method contains generics. Overriding methods without generics already works, this patch simply makes the behavior consistent.

Original pull request: #162.

Author: terje2001

src/main/java/org/springframework/data/repository/core/support/DefaultRepositoryInformation.java

@@ -356,7 +356,10 @@ private boolean parametersMatch(Method method, Method baseClassMethod) {
 					return false;
 				}
 			} else {
-				if (!types[i].equals(parameterType)) {
+				// We must either have an exact match, or,
+				if (!types[i].equals(parameterType) &&
+						// the tpes must be assignable _and_ signature definition types must be identical.
+						!(types[i].isAssignableFrom(parameterType) && types[i].equals(method.getParameterTypes()[i]))) {
 					return false;
 				}
 			}

src/test/java/org/springframework/data/repository/core/support/DefaultRepositoryInformationUnitTests.java

@@ -94,6 +94,22 @@ public void discoversCustomlyImplementedCrudMethod() throws SecurityException, N
 		assertThat(information.getTargetClassMethod(source), is(expected));
 	}
 
+	/**
+	 * @see DATACMNS-854
+	 */
+	@Test
+	public void discoversCustomlyImplementedCrudMethodWithGenerics() throws SecurityException, NoSuchMethodException {
+
+		RepositoryMetadata metadata = new DefaultRepositoryMetadata(FooRepository.class);
+		RepositoryInformation information = new DefaultRepositoryInformation(metadata, CrudRepository.class,
+			customImplementation.getClass());
+
+		Method source = FooRepositoryCustom.class.getMethod("exists", Object.class);
+		Method expected = customImplementation.getClass().getMethod("exists", Object.class);
+
+		assertThat(information.getTargetClassMethod(source), is(expected));
+	}
+
 	@Test
 	public void considersIntermediateMethodsAsFinderMethods() {
 
@@ -248,8 +264,11 @@ interface FooRepository extends CrudRepository<User, Integer>, FooRepositoryCust
 		User findOne(Long primaryKey);
 	}
 
-	interface FooRepositoryCustom {
+	interface FooSuperInterfaceWithGenerics<T> {
+		boolean exists(T id);
+	}
 
+	interface FooRepositoryCustom extends FooSuperInterfaceWithGenerics<User> {
 		User save(User user);
 	}