Grails外域没有获取记录并抛出内存异常

Question

我试图获取辅助域的记录，即与Vehicle域相关联的Vehicle Details Domain。

以下是我的域名类。

class MRVehicle {

    String make
    String brand
    String model
    String versione
    String plateNumber

    MRVehicleDetail vehicleDetail

    static hasOne = [vehicleDetail : MRVehicleDetail]

    static mapping = {

        sort("id")
        cache true

        table name: "parco_veicoli"//, schema: "public"
        id generator:'sequence', params:[sequence:'parco_veicoli_seq']
        id column: "id", sqlType: "int4"

        model column: "modello"
        brand column: "marca"
        versione column: "versione"
        plateNumber column: "targa"
        vehicleDetail cascade: 'all',fetch: 'join',unique: true

        version false
    }
}

和

class MRVehicleDetail {

    Double vanMaxLengthExtVehicle
    Double vanMaxWidthExtVehicle
    Double vanMaxHeighExtVehicle
    Double vanMaxLengthIntLoadComp
    MRVehicle parco

    static mapping = {
        table name: "vehicle_detail"//, schema: "public"
        id column: "id", sqlType: "int4" , generator: 'foreign', params: [property: 'parco']
        parco column: 'id', insertable: false, updateable: false , sqlType: "int4"

        vanMaxLengthExtVehicle column: "van_max_length_ext_vehicle"
        vanMaxWidthExtVehicle column: "van_max_width_ext_vehicle"
        vanMaxHeighExtVehicle column: "van_max_heigh_ext_vehicle"
        vanMaxLengthIntLoadComp column: "van_max_length_int_load_comp"
        version false
    }
}

如果我尝试在我的GSP页面上获取车辆详细信息实例，请执行以下操作： -

${MRvehicle.vehicleDetail.vanMaxLengthExtVehicle}

执行上述行时，我的内存异常。