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我在 Netbeans 6.9.1 中针对 Oracle 11g 使用 EclipseLink (JPA 2) 时遇到问题。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;
}

尽管检查了我有一个有效的实体类,但我不知道为什么会失败。预先感谢您的协助。

克里斯

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1 回答 1

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也许尝试:

SELECT l FROM Lookup而不是SELECT l FROM lookup

于 2011-02-12T11:22:22.060 回答