如何在Spring数据Jpa中使用投影返回自定义对象?

本机查询

这是我到目前为止所做的 How to return a custom object from a Spring Data JPA GROUP BY query

Query(nativeQuery = true, value = "select sc.case_type as caseType, sc.revision as revision from smart_casemodel sc minus select s.casetype, s.revision from smart_case s")
List<CtRevOnly> findNotUsedCasemodels();

我声明了投影接口

public interface CtRevOnly {
    String getCaseType();
    String getRevision();
}

caseModelRepository.findNotUsedCasemodels();

但是我有个例外

javax.persistence.PersistenceException异常: javax.persistence.Tuple

知道我做错什么了吗?