我正在使用SpringBootApplication和JPA来定义控制器Map并执行CRUD操作。我想通过emailId从数据库中获取学生详细信息。我已经在DAO中编写了SQL查询，但它返回的sql行是String格式。我如何Map到StudentDetail对象？findById只接受整数类型的ID。我想通过emailID查找它。有没有类似findByEmailId的方法？
StudentDetail.java

@Table(name="studentpersonaldetails")
@Entity
public class StudentDetail {

    @Id
    @Column(name="emailid")
    String emailId;
    @Column(name="firstname")
    String firstName;
    @Column(name="lastname")
    String lastName;
    @Column(name="mobilenumber")
    String mobileNumber;
    String address;
    String batch;
    String course;
    String gender;
    String year;

    Paramaterised constructor, getters-setters &  toString method 
}

StudentController.java

@GetMapping("/getpersonaldetails/{emailId}")
    public StudentDetail getPersonalDetails(@PathVariable String emailId)
    {
        emailId = emailId.substring(1);
        return studentService.getPersonalDetails(emailId);      
    }

StudentService.java

public StudentDetail getPersonalDetails(String emailId) {   
        return studentDao.getPersonalDetails(emailId);
}

StudentDAO.java

@Query(value = "SELECT * FROM studentpersonaldetails WHERE emailId=?1", nativeQuery = true)
    StudentDetail getPersonalDetails(String emailId);

错误

org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [com.cdac.hms.model.StudentDetail]