Spring Data Rest - PersistentEntity不能为null

Question

我正在尝试从Spring Data Rest Call中传输结果并收到错误：

java.lang.IllegalArgumentException: PersistentEntity不能为空！

当我不尝试传输结果时，调用有效。任何见解都表示赞赏。

这是存储库定义：

/**
 * 
 */
package com.xxx.beverage.repository.db2;

import java.util.List;
import java.util.stream.Stream;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
import org.springframework.data.rest.core.annotation.RestResource;
import org.springframework.transaction.annotation.Transactional;

import com.xxx.xxx.model.db2.Vbrk;

@RepositoryRestResource
public interface VbrkRepository extends PagingAndSortingRepository<Vbrk, String> {

    Vbrk findOne(String id);

    @RestResource(path="findByKunag")
    @Query(value="SELECT * FROM VBRK v WHERE v.KUNAG = :kunag ", nativeQuery=true)
    Stream<Vbrk> findByKunagAndStream(@Param("kunag") String kunag);

    Page<Vbrk> findAll(Pageable pageable);

}