[appengine-java] return an empty result from jdo query,any help?

[ice_stream]

Hi,all:
i write a DAO in application, and i do a local junit test ,it seems ok.

public List<DesignElement> findByType(String type,PageModel pageModel)
    {
        PersistenceManager pm = PMF.get().getPersistenceManager();
        Query q=pm.newQuery(DesignElement.class);
        q.setFilter("type == typeparam");
        q.declareParameters("String typeparam");
        q.setRange(pageModel.getStartPos()-1, pageModel.getEndPos());
        return (List<DesignElement>)q.execute(type);
    } 

 but when i test it in local dev server,an empty List is return.However, i 
check the page in the http://localhost:8080/_ah/admin,i can find some 
DesignElement pojo on the list,if i just find all by this code:

public List<DesignElement> getAll()
    {
        PersistenceManager pm = PMF.get().getPersistenceManager();
        Query q=pm.newQuery(DesignElement.class);
        q.setRange(0,20);
        return (List<DesignElement>) q.execute();
    }

all the pojo can be returned.
so ,what's the problem?
by the way,i have a datastore-indexs.xml in the WEB-INF/ with 
autoGenerate="true".
thanks for any help!!

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