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我在 Grails 3 应用程序中使用 MongoDB 数据库，在进行一些单一测试时遇到了一些问题。

这是我的域类

@ToString(includeFields = true, includeNames = true, excludes = "dateCreated, lastUpdated, metaClass, sites")
@EqualsAndHashCode(excludes = "site")
class Campaign {

    static mapWith = "mongo"

    ObjectId id
    String name
    Boolean manualActive
    Date startDate
    Date endDate

    static belongsTo = [site:Site]

    static constraints = {
        name size: 1..255, blank:false

        manualActive nullable:true, validator: {val, obj->
            (val != null && obj.startDate == null && obj.endDate == null) || (val == null && obj.startDate != null)
        }
        startDate nullable:true, validator: {val, obj->
            (val != null && obj.manualActive == null) || (val == null && obj.manualActive != null)
        }
        endDate nullable:true, validator: {val, obj ->
            (val != null && obj.startDate != null) || (val == null)
        }
    }
}

我还使用 build-test-data 插件来简化测试的数据创建，如果我尝试以下类似的操作，我会收到 StackoverflowException：

@TestFor(CampaignService)
@Mock([Site, Campaign])
@Build([Site, Campaign])
class CampaignServiceSpec extends Specification {

    def setup() {
    }

    def cleanup() {
    }

    void "Test that isSameCampaign throws a ForbiddenException if no site is given"() {
        given:
            def campaign = Campaign.build(id:new ObjectId(), manualActive:true)
            def site = null
        when:
            service.isSameSite(site, campaign)
        then:
            thrown ForbiddenException
    }

    void "Test that isSameCampaign throws a ForbiddenException if it mismatches from the campaign"() {
        given:
            def site = Site.build(id:new ObjectId(), )
            def campaign = Campaign.build(id:new ObjectId(), manualActive:true)
        when:
            service.isSameSite(site, campaign)
        then:
            thrown ForbiddenException
    }

    void "Test that isSameCampaign does NOT throw a ForbiddenException if no campaign is given"() {
        given:
        def site = Site.build(id:new ObjectId(), )
        def campaign = Campaign.build(id:new ObjectId(), site:site,manualActive:true)
        when:
            service.isSameSite(site, campaign)
        then:
            notThrown ForbiddenException
    }
}

但是，如果我从域类中删除 de @ToString() 注释并实现我自己的 toString 方法，则测试运行正常。任何想法为什么会发生这个stackoverflowException？它可能与 ObjectId 字段有关吗？

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