Polishing SimpleJpaRepository

1. `TypedQuery.set*()` returns the same query instance
2. remove `if (spec != null)` since `spec` must not be null

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/SimpleJpaRepository.java

@@ -244,7 +244,7 @@ public void deleteAllByIdInBatch(Iterable<ID> ids) {
 			 * Some JPA providers require {@code ids} to be a {@link Collection} so we must convert if it's not already.
 			 */
 
-			if (Collection.class.isInstance(ids)) {
+			if (ids instanceof Collection) {
 				query.setParameter("ids", ids);
 			} else {
 				Collection<ID> idsCollection = StreamSupport.stream(ids.spliterator(), false)
@@ -481,12 +481,10 @@ public long delete(Specification<T> spec) {
 		CriteriaBuilder builder = this.entityManager.getCriteriaBuilder();
 		CriteriaDelete<T> delete = builder.createCriteriaDelete(getDomainClass());
 
-		if (spec != null) {
-			Predicate predicate = spec.toPredicate(delete.from(getDomainClass()), null, builder);
+		Predicate predicate = spec.toPredicate(delete.from(getDomainClass()), null, builder);
 
-			if (predicate != null) {
-				delete.where(predicate);
-			}
+		if (predicate != null) {
+			delete.where(predicate);
 		}
 
 		return this.entityManager.createQuery(delete).executeUpdate();
@@ -853,11 +851,13 @@ private <S> TypedQuery<S> applyRepositoryMethodMetadata(TypedQuery<S> query) {
 		}
 
 		LockModeType type = metadata.getLockModeType();
-		TypedQuery<S> toReturn = type == null ? query : query.setLockMode(type);
+		if (type == null) {
+			query.setLockMode(type);
+		}
 
-		applyQueryHints(toReturn);
+		applyQueryHints(query);
 
-		return toReturn;
+		return query;
 	}
 
 	private void applyQueryHints(Query query) {