DATAJPA-564 - Allow SpEL expressions to be the only consumer of query method parameters.

We now allow the parameters of query methods to also be exclusively consumed by expressions within a given query string. Previously this wasn't possible due to to strict checks for parameter usage in JpaQueryMethod.
Relax check for query param usage in JpaQueryMethod.

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

@@ -58,8 +58,8 @@ import org.springframework.data.jpa.domain.sample.Address;
 import org.springframework.data.jpa.domain.sample.Role;
 import org.springframework.data.jpa.domain.sample.SpecialUser;
 import org.springframework.data.jpa.domain.sample.User;
-import org.springframework.data.jpa.repository.sample.UserRepository;
 import org.springframework.data.jpa.repository.sample.SampleSecurity.SampleSecurityContextHolder;
+import org.springframework.data.jpa.repository.sample.UserRepository;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.transaction.annotation.Transactional;
@@ -1706,6 +1706,32 @@ public class UserRepositoryTests {
 		assertThat(users.get(0), is(secondUser));
 	}
 
+	/**
+	 * @see DATAJPA-564
+	 */
+	@Test
+	public void shouldfindUsersByFirstnameForSpELExpressionOnlyWithParameterNameVariableReference() {
+
+		flushTestUsers();
+		List<User> users = repository.findUsersByFirstnameForSpELExpressionWithParameterVariableOnly("Joachim");
+
+		assertThat(users, hasSize(1));
+		assertThat(users.get(0), is(secondUser));
+	}
+
+	/**
+	 * @see DATAJPA-564
+	 */
+	@Test
+	public void shouldfindUsersByFirstnameForSpELExpressionOnlyWithParameterIndexReference() {
+
+		flushTestUsers();
+		List<User> users = repository.findUsersByFirstnameForSpELExpressionWithParameterIndexOnly("Joachim");
+
+		assertThat(users, hasSize(1));
+		assertThat(users.get(0), is(secondUser));
+	}
+
 	private Page<User> executeSpecWithSort(Sort sort) {
 
 		flushTestUsers();

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

@@ -507,4 +507,16 @@ public interface UserRepository extends JpaRepository<User, Integer>, JpaSpecifi
 	 */
 	@Query("select u from User u where u.firstname = ?1 and u.firstname=?#{[0]} and u.emailAddress = ?#{principal.emailAddress}")
 	List<User> findByFirstnameAndCurrentUserWithCustomQuery(String firstname);
+
+	/**
+	 * @see DATAJPA-564
+	 */
+	@Query("select u from User u where u.firstname = :#{#firstname}")
+	List<User> findUsersByFirstnameForSpELExpressionWithParameterVariableOnly(@Param("firstname") String firstname);
+
+	/**
+	 * @see DATAJPA-564
+	 */
+	@Query("select u from User u where u.firstname = ?#{[0]}")
+	List<User> findUsersByFirstnameForSpELExpressionWithParameterIndexOnly(String firstname);
 }