Spring Data LDAP是Spring Data项目的子项目，提供了面向LDAP存储库的Spring Data规范实现。
它让开发者可以像使用Spring Data JPA一样操作LDAP，支持Entity、Repository和Projection等功能。
问题出现在使用Projection投影查询实体的特定字段时：当实体字段使用@Attribute注解进行字段映射时，查询结果中相关字段值为空。
kotlin-jpa插件会为data class生成无参构造器，导致非空字段跳过了Null检查
@Entity
class ProjectInfo(
var name: String,
var code: String,
var ownerName: String,
var applicantName: String,
var companyCode: String,
var companyName: String,
var projectType: ProjectType,
var submitDate: LocalDateTime = LocalDateTime.now(),
var planStartDate: LocalDate?,
var planEndDate: LocalDate?,
var endDate: String,
var targetCustomers: Array<String>?,
var formStatus: ApplicationStatus = ApplicationStatus.DRAFT,
var projectStatus: ApplicationProjectStatus = ApplicationProjectStatus.DRAFT,
var comments: String?
) {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
val id: Long = -1
}