DATAJPA-405 - Guard against null predicates on query creation.

We now only call CriteriaQuery.where(…) if the predicate we handle is a non-null value. Adapted Jpa(Count)QueryCreator accordingly.

src/test/java/org/springframework/data/jpa/repository/UserRepositoryTests.java

@@ -1136,6 +1136,20 @@ public class UserRepositoryTests {
 		assertThat(repository.findByActiveTrue().size(), is(0));
 	}
 
+	/**
+	 * @see DATAJPA-405
+	 */
+	@Test
+	public void executesFinderWithOrderClauseOnly() {
+
+		flushTestUsers();
+
+		List<User> result = repository.findAllByOrderByLastnameAsc();
+
+		assertThat(result, hasSize(4));
+		assertThat(result, contains(secondUser, firstUser, thirdUser, fourthUser));
+	}
+
 	private Page<User> executeSpecWithSort(Sort sort) {
 
 		flushTestUsers();

src/test/java/org/springframework/data/jpa/repository/sample/UserRepository.java

@@ -283,4 +283,9 @@ public interface UserRepository extends JpaRepository<User, Integer>, JpaSpecifi
 	@Modifying
 	@Query("update #{#entityName} u set u.active = :activeState where u.id in :ids")
 	void updateUserActiveState(@Param("activeState") boolean activeState, @Param("ids") Integer... ids);
+
+	/**
+	 * @see DATAJPA-405
+	 */
+	List<User> findAllByOrderByLastnameAsc();
 }