Grails + Spock：在嵌入式 hasMany 字段上执行 addTo* 时出现 NullPointerException答案

【问题标题】：Grails + Spock: NullPointerException when doing addTo* on an embedded hasMany fieldGrails + Spock：在嵌入式 hasMany 字段上执行 addTo* 时出现 NullPointerException
【发布时间】：2025-12-09 07:00:02
【问题描述】：

我有域类：

class MarketCommoditiesConfiguration extends MarketConfiguration {

    static mapWith = "mongo"

    static hasMany = ['commodities': Commodity]

    static embedded = ['commodities']

    ...

在addToCommodities 之后执行save 会引发以下异常。

|  java.lang.NullPointerException
    at org.grails.datastore.mapping.model.types.Association.getInverseSide(Association.java:71)
    at org.grails.datastore.mapping.engine.NativeEntryEntityPersister.handleEmbeddedInstance(NativeEntryEntityPersister.java:1254)
    at org.grails.datastore.mapping.engine.NativeEntryEntityPersister.handleEmbeddedInstance(NativeEntryEntityPersister.java:1215)
    at org.grails.datastore.mapping.engine.NativeEntryEntityPersister.handleEmbeddedToMany(NativeEntryEntityPersister.java:1188)
    at org.grails.datastore.mapping.engine.NativeEntryEntityPersister.persistEntity(NativeEntryEntityPersister.java:1077)
    at org.grails.datastore.mapping.engine.NativeEntryEntityPersister.persistEntity(NativeEntryEntityPersister.java:1138)
    at org.grails.datastore.mapping.engine.EntityPersister.persist(EntityPersister.java:160)
    at org.grails.datastore.mapping.core.AbstractSession.persist(AbstractSession.java:522)
    at org.grails.datastore.gorm.GormInstanceApi.doSave(GormInstanceApi.groovy:194)
    at org.grails.datastore.gorm.GormInstanceApi.save_closure5(GormInstanceApi.groovy:162)
    at org.grails.datastore.mapping.core.DatastoreUtils.execute(DatastoreUtils.java:302)
    at org.grails.datastore.gorm.AbstractDatastoreApi.execute(AbstractDatastoreApi.groovy:37)
    at org.grails.datastore.gorm.GormInstanceApi.save(GormInstanceApi.groovy:161)
    at com.apposit.terra.connect.service.MarketService.addCommodityToMarket(MarketService.groovy:248)
    at com.apposit.terra.connect.service.MarketServiceSpec.Test addCommodityToMarket creates a new next month configuration if current month's configuration doesn't exist(MarketServiceSpec.groovy:164)

【问题讨论】：

标签： grails grails-orm grails-2.0 spock

【解决方案1】：

将Keyword 放入@Mock 注释中解决了它。 http://grails.1312388.n4.nabble.com/Grails-MongoDb-embedded-collection-causes-nullpointerexception-td4644098.html 包含更多相关讨论。

我知道这是超级旧的，但谷歌搜索把我带到了这里面临同样的问题。确保您已将 @Mock(User) 添加到你的单元测试类。就我而言，我有多个级别的嵌入式域类，并且它们中的每一个都必须被嘲笑。 - clarkdustin

【讨论】：