给定以下实体模型：

@Entity(name = "Accounts")
open class AccountEntity(
    @field:Id
    @field:GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "accounts_sequence_generator")
    @field:SequenceGenerator(name = "accounts_sequence_generator", sequenceName = "sequence_accounts")
    @field:Column(name = "id", nullable = false, unique = true)
    open var id: Long? = null,

    @field:[NotBlank Size(min = 2, max = 255, message = "username must be between 2 and 255 characters long")]
    @field:Column(name = "username", nullable = false, unique = true)
    open var username: String,

    @field:Embedded
    open var address: Address?
)

@Embeddable
data class Address(
    @field:Embedded
    val geolocation: Geolocation
)

@Embeddable
data class Geolocation(
    @field:Column(name = "geolocation", columnDefinition = "geography(POINT,4326)")
    val geolocation: Point
)

我想使用带构造函数表达式的DTO投影执行查询：

val query = entityManager.createQuery(
            "select new org.example.dto.AccountSummary(acc.address.geolocation.geolocation, acc.id, acc.username) from Accounts acc" +
                    "",
            AccountSummary::class.java
        )
        return query.resultList

其中，AccountSummary 类如下所示：

@Introspected
data class AccountSummary(
    val point: Location,
    val id: Long,
    val username: String
)

但是，我还想将geolocation属性（类型为 Point）转换为自定义的 Location 数据类，因此我注册了一个从 Geometry 到 Location 的自定义TypeConverter：

@Singleton
class GeometryLocationConverter : TypeConverter<Geometry, Location> {
    override fun convert(`object`: Geometry?, targetType: Class<Location>?, context: ConversionContext?): Optional<Location> {
        return when (`object`) {
            is Point -> Optional.of(Location(`object`.y, `object`.x))
            else -> throw Exception("unknown geometry type")
        }
    }
}

但是，会掷回例外状况，错误如下：无法在类AccountSummary上找到适当的构造函数。是否可能发生类似的情况？我尚未找到任何展示此用例的示例。