Question

我在Netbeans 6.9.1中针对Oracle 11g使用EclipseLink（JPA 2）时出现问题。尝试运行本机查询时，我不断收到以下错误：

Exception Description: Missing descriptor for [class Novartis.OTM.Data.Db.Entities.Lookup].
Query: ReadAllQuery(referenceClass=Lookup sql="SELECT l FROM lookup l WHERE l.lookup_type = :LookupType AND domain = :Domain")

他是代码：

public List<SelectItem> getLookupForUI(enumLookupType lookupType, String domain) throws Exception {
    if (domain == null || domain.trim().equals(""))
        throw new Exception("Parameter domain cannot be null or empty.");
    else if (!this.isInitialized())
        throw new Exception("Entity Manager not set.");

    Query query = this._EM.createNativeQuery(_QueryGetLookupForUI, Lookup.class);
    query.setParameter("LookupType", lookupType.toString());
    query.setParameter("Domain", domain.trim());

    List<SelectItem> selectItems = null;

    List<Lookup> lookupList = (List<Lookup>) query.getResultList();
    if (lookupList == null || lookupList.size() < 1)
        return null;
    else {
        selectItems = new ArrayList<SelectItem>(lookupList.size());
        for (Lookup lookUp : lookupList) {
            selectItems.add(new SelectItem(lookUp.getLookupValue(), lookUp.getLookupName()));
        }
    }

    return selectItems;
}

尽管检查我有一个有效的实体类，但我不知道为什么会失败。提前感谢您的帮助。

克里斯

Answer 1

也许试试：

SELECT l FROM Lookup代替SELECT l FROM lookup？

EclipseLink（JPA 2）缺少描述符异常

1 个答案: