Spring Boot Kotlin 数据类未使用 REST 控制器中的默认值初始化

我已经开始将一个Spring Boot应用程序从Java迁移到Kotlin.在此之前，一切都运行得很完美.现在我不能更新通过PUT/POST接收的任何实体，因为数据不包含来自数据类的缺省值

一个实体看起来是这样的:

package org.some.soft.domain

import java.util.*
import javax.persistence.*

@Entity
@Table(name = "book_item")
data class BookItem (

    @ManyToOne(cascade = [CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH])
    var book: Book,

    @Column(name = "format", nullable = false)
    var format: BookFormat = BookFormat.HARDCOVER,

    @Column(name = "barcode", nullable = false)
    var barcode: String = "0000000000000",

    @Column(name = "label", unique = true)
    var label: String? = null,

    @Column(name = "isReferenceOnly", nullable = false)
    var referenceOnly: Boolean = false,

    @Column(name = "borrowed")
    var borrowed: Date? = null,

    @Column(name = "dueDate")
    var dueDate: Date? = null,

    @Column(name = "price")
    var price: Double? = null,

    @Column(name = "status", nullable = false)
    var status: BookStatus = BookStatus.AVAILABLE,

    @Column(name = "dateOfPurchase")
    var dateOfPurchase: Date = Date(),

    @Column(name = "publicationDate", nullable = false)
    var publicationDate: Date = Date(),

    @Id
    @Column(name = "id", nullable = false)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
    @SequenceGenerator(name = "sequenceGenerator")
    var id: Long? = null,
)

我通过以下控制器接收数据:

    @PutMapping("/book/items")
    fun updateBookItem(@RequestBody book: @Valid BookItem): ResponseEntity<BookItem> {
        val result = bookService.updateBook(book)
        return ResponseEntity
            .ok()
            .headers(HeaderUtil.createEntityUpdateAlert(applicationName, true, ENTITY_NAME, book.id.toString()))
            .body(result)
    }

该服务只是从JPA-Repository(bookItemRepository.save(bookItem))调用了save方法，这就是我收到以下错误的步骤:

NULL not allowed for column "PUBLICATION_DATE"; SQL statement:
update book_item set barcode=?, book_id=?, borrowed=?, date_of_purchase=?, due_date=?, format=?, label=?, price=?, publication_date=?, is_reference_only=?, status=? where id=? [23502-214]

在this个教程之后，通过复制来自另一个JHipster项目的Gradle版本，我添加了以下插件:

apply plugin: "kotlin" // Required for Kotlin integration
apply plugin: "kotlin-kapt" // Required for annotations processing
apply plugin: "kotlin-spring" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#spring-support
apply plugin: "kotlin-allopen" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#using-in-gradle
apply plugin: "kotlin-jpa" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#jpa-support
apply plugin: "io.gitlab.arturbosch.detekt"

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:${kotlin_version}"
    implementation "org.jetbrains.kotlin:kotlin-reflect:${kotlin_version}"


    kapt "org.mapstruct:mapstruct-processor:${mapstructVersion}"
    kapt "org.hibernate:hibernate-jpamodelgen:${hibernateVersion}"
    kapt "org.glassfish.jaxb:jaxb-runtime:${jaxbRuntimeVersion}"

    testImplementation "org.jetbrains.kotlin:kotlin-test-junit:${kotlin_version}"

    testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0"
}

allOpen {
    annotation("javax.persistence.Entity")
    annotation("javax.persistence.MappedSuperclass")
    annotation("javax.persistence.Embeddable")
}

但是我还是遇到了一个问题，那就是Spring Boot没有使用我的数据类的默认值.我也进行了调试，属性没有用它们的缺省值进行初始化.

我还try 将var更改为val，但错误仍然存在

注意:我不会从客户端发送空值.我的请求正文只包含不是null的值

非常提前感谢！