的Groovy/Grails的映射錯誤未知列「類」

最近我已經開始使用Groovy和Grails，但我有以下錯誤：的Groovy/Grails的映射錯誤未知列「類」

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:
Unknown column 'class' in 'field list' at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) at com.mysql.jdbc.Util.getInstance(Util.java:387) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:942)

但我的實體和它的母親沒有按「T有類屬性看有沒有一流的領域，但在MySQL插入莫名其妙目前的

class Freight extends Base { 

String codeBegin 
String codeEnd 
BigDecimal weight 
BigDecimal value 
BigDecimal minValue 
FreightRange range 

Integer time 

FreightType type 
String name 
Integer leadTime 
BigDecimal realFreightValue 
String realFreightName 
FreightType realFreightType 
Manufacturer manufacturer 

static embedded = ['range'] 

static transients = ['type', 'name', 'leadTime', 'realFreightValue', 'realFreightName', 'realFreightType', 'manufacturer'] 

static belongsTo = [partnerFreightType: PartnerFreightType] 

static mapping = { 
    version false 
} 

static constraints = { 
    codeBegin nullable: true, blank: true, validator: Freight.rangeValidator 
    codeEnd nullable: true, blank: true, validator: Freight.rangeValidator 
    weight nullable: false, min: BigDecimal.valueOf(0.001) 
    value nullable: false, min: BigDecimal.valueOf(0), max: BigDecimal.valueOf(9999.99) 
    minValue nullable: false, min: BigDecimal.valueOf(0) 
    range nullable: true 
    time nullable: true 
} 

static rangeValidator = { val, obj -> 
    if (obj.codeBegin?.replace('-', '')?.toInteger() > obj.codeEnd?.replace('-', '')?.toInteger()) 
     return 'freight.error.range' 
} 

String getHash() { 
    (this.partnerFreightType + this.type + this.value).encodeAsMD5() 
} 


void useRange(FreightRange range) { 
    this.range = range 

    def codes = range.codes() 

    this.codeBegin = codes.min 
    this.codeEnd = codes.max 
}

}

來源

2017-08-28 Roberto Fonseca

您是否也可以分享'Base'的代碼？ – Daniel

何時發生此錯誤？ – Roland