Ejb 3.0 createNativeQuery with resultClass

Question

As suggested by Shay Shmeltzer on the jdev forum, I post this question on the toplink forum.
I am developing an application with jsf+ejb. I need to create a search form with a complex query, so I think I need to use a native query with entity manager’s createNativeQuery method. The query execution should then populate a List<ScrSoggElenco> variable, where ScrSoggElenco is the class I use as ‘data type hint’ for the table in which the query results are shown.
I am trying to do this by using the
createNativeQuery(String sqlString, Class resultClass)
method.
My code is like this
Query q = em.createNativeQuery(nativeQuery,ScrSoggElenco.class);
List<ScrSoggElenco> res = q.getResultList();
But q.getResultList() throws an exception:
javax.faces.el.EvaluationException: javax.faces.el.EvaluationException: Error getting property 'soggetti' from bean of type view.backing.ScrElencoSogg: javax.ejb.EJBException: Exception [TOPLINK-6007] (Oracle TopLink Essentials - 2006.8 (Build 060829)): oracle.toplink.essentials.exceptions.QueryException
Exception Description: Missing descriptor for [class model.ScrSoggElenco].
Query: ReadAllQuery(model.ScrSoggElenco); nested exception is: Exception [TOPLINK-6007] (Oracle TopLink Essentials - 2006.8 (Build 060829)): oracle.toplink.essentials.exceptions.QueryException
Exception Description: Missing descriptor for [class model.ScrSoggElenco].
Query: ReadAllQuery(model.ScrSoggElenco)
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:190)
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:143)
It seems it looks for a descriptor of class model.ScrSoggElenco, I don’t know where and how to specify such descriptor.
I tried also a simpler example, with a simpler query and a simple ‘String’ class in place of ScrSoggElenco, but I got the same exception: Missing descriptor for [class java.lang.String] .
Thanks in advance, Mauro

Answer 1

At this point I have to post the full code of my ejb method.
You can see my query is quite complex to be written with ejbql, maybe the most difficult point is how to calculate the age of the person:
floor(months_between(sysdate,SO_SOGGETTO.DATA_NASCITA)/12) eta
how do you express this with ejbql?
I have ‘solved’ the problem with a loop that transforms each object array in an instance of ScrSoggElenco (yes, ScrSoggElenco is an arbitrary class, not a mapped entity). Of course I would like to find a more direct statement to do this.
Thanks, Mauro
public List<ScrSoggElenco> findElencoSogg(Object cognome)
String nativeQuery =
"select codts, cognome, nome, DATA_NASCITA, escl, dtapp, desc_tpinv, desc_esito, eta,\n" +
"dtrichiamo, tprich\n" +
"from\n" +
"(\n" +
"\n" +
"SELECT\n" +
" SO_SOGGETTO.COGNOME,\n" +
" SO_SOGGETTO.NOME,\n" +
" SO_SOGGETTO.DATA_NASCITA,\n" +
" fun_esclusione(SO_SOGGETTO.CODTS,SO_SOGGETTO.ULSS,SO_CNF_TPSCR.CODSCR) escl,\n" +
" SO_INVITO.DTAPP,\n" +
" SO_CNF_TPINVITO.DESCRBREVE desc_tpinv,\n" +
" SO_CNF_ESITOINVITO.DESCRBREVE desc_esito,\n" +
" SO_INVITO.CONSENSO,\n" +
"\n" +
" SO_INVITO.IDCENTROPRELIEVO,\n" +
" SO_SOGGETTO.CF,\n" +
" SO_SOGGETTO.CODTS,\n" +
" SO_SOGGETTO.CODCOMRES,\n" +
" SO_SOGGETTO.CODDISTRZONA,\n" +
" SO_SOGGETTO.CODICEREGMEDICO,\n" +
" SO_CNF_TPSCR.CODSCR tpscr,\n" +
" SO_SOGGETTO.ulss,\n" +
" 1 invpres,\n" +
" SO_INVITO.IDINVITO idinvito,\n" +
" floor(months_between(sysdate,SO_SOGGETTO.DATA_NASCITA)/12) eta,\n" +
" SO_INVITO.IDCENTROREF1LIV idcref,\n" +
" SO_INVITO.LIVELLO,\n" +
" to_date(fun_get_richiamo(so_soggetto.codts,so_soggetto.ulss,SO_CNF_TPSCR.CODSCR,3),'dd/mm/yyyy') dtrichiamo,\n" +
" fun_get_richiamo(so_soggetto.codts,so_soggetto.ulss,SO_CNF_TPSCR.CODSCR,0) TPRICH,\n" +
" SO_SOGG_SCR.ALTORISCHIO,\n" +
" fun_restituire_lastre(SO_SOGGETTO.CODTS,SO_CNF_TPSCR.CODSCR) restituire\n" +
"\n" +
" FROM SO_SOGGETTO, SO_INVITO, SO_CNF_TPINVITO, SO_CNF_ESITOINVITO, SO_CNF_TPSCR, SO_SOGG_SCR\n" +
" where SO_INVITO.CODTS = SO_SOGGETTO.CODTS\n" +
" AND SO_INVITO.ULSS = SO_SOGGETTO.ULSS\n" +
" AND SO_INVITO.TPSCR = SO_CNF_TPSCR.CODSCR\n" +
" and SO_INVITO.attivo = 1\n" +
"\n" +
" and SO_CNF_TPINVITO.IDTPINVITO = SO_INVITO.IDTPINVITO\n" +
" and SO_CNF_TPINVITO.ULSS = SO_INVITO.ULSS\n" +
" and SO_CNF_TPINVITO.TPSCR = SO_INVITO.TPSCR\n" +
"\n" +
" and SO_CNF_ESITOINVITO.CODESITOINVITO (+) = SO_INVITO.CODESITOINVITO\n" +
" and SO_CNF_ESITOINVITO.LIVESITO (+) = SO_INVITO.LIVESITO\n" +
" and SO_CNF_ESITOINVITO.ULSS (+) = SO_INVITO.ULSS\n" +
" and SO_CNF_ESITOINVITO.TPSCR (+) = SO_INVITO.TPSCR\n" +
" AND (SO_CNF_TPSCR.SESSO IS NULL OR SO_SOGGETTO.SESSO = SO_CNF_TPSCR.SESSO)\n" +
" AND SO_SOGG_SCR.codts = SO_SOGGETTO.codts\n" +
" AND SO_SOGG_SCR.ulss = SO_SOGGETTO.ulss\n" +
" AND SO_SOGG_SCR.tpscr = SO_CNF_TPSCR.codscr\n" +
"\n" +
"union all\n" +
"\n" +
" SELECT\n" +
" SO_SOGGETTO.COGNOME,\n" +
" SO_SOGGETTO.NOME,\n" +
" SO_SOGGETTO.DATA_NASCITA,\n" +
" fun_esclusione(SO_SOGGETTO.CODTS,SO_SOGGETTO.ULSS,SO_CNF_TPSCR.CODSCR) escl,\n" +
" to_date(null),\n" +
" null,\n" +
" null,\n" +
" null,\n" +
"\n" +
" null,\n" +
" SO_SOGGETTO.CF,\n" +
" SO_SOGGETTO.CODTS,\n" +
" SO_SOGGETTO.CODCOMRES,\n" +
" SO_SOGGETTO.CODDISTRZONA,\n" +
" SO_SOGGETTO.CODICEREGMEDICO,\n" +
" SO_CNF_TPSCR.CODSCR tpscr,\n" +
" SO_SOGGETTO.ulss,\n" +
" 0 invpres,\n" +
" null idinvito,\n" +
"floor(months_between(sysdate,SO_SOGGETTO.DATA_NASCITA)/12) eta,\n" +
" null idcref,\n" +
" null livello,\n" +
" to_date(fun_get_richiamo(so_soggetto.codts,so_soggetto.ulss,SO_CNF_TPSCR.CODSCR,3),'dd/mm/yyyy') dtrichiamo,\n" +
" fun_get_richiamo(so_soggetto.codts,so_soggetto.ulss,SO_CNF_TPSCR.CODSCR,0) TPRICH,\n" +
" to_number(null),\n" +
" 0 restituire\n" +
"\n" +
" FROM SO_SOGGETTO,SO_CNF_TPSCR\n" +
" where not exists\n" +
" (select 1 from SO_INVITO\n" +
" where SO_INVITO.CODTS = SO_SOGGETTO.CODTS\n" +
" AND SO_INVITO.ULSS = SO_SOGGETTO.ULSS\n" +
" AND SO_INVITO.TPSCR = SO_CNF_TPSCR.CODSCR\n" +
" and SO_INVITO.attivo = 1)\n" +
" AND (SO_CNF_TPSCR.SESSO IS NULL OR SO_SOGGETTO.SESSO = SO_CNF_TPSCR.SESSO)\n" +
" ) " +
"where cognome like '" + cognome + "%'";
String nativeQuery = "select cognome from so_soggetto " +
"where cognome like '" + cognome + "%'";
//Query q = em.createNativeQuery(nativeQuery,ScrSoggElenco.class);
Query q = em.createNativeQuery(nativeQuery);
List<ScrSoggElenco> res = q.getResultList();
Object[] listaSogg = res.toArray();
int size = listaSogg.length;
List<ScrSoggElenco> elenco = new ArrayList<ScrSoggElenco>();
for (int i=0 ;i<size ;i++ )
Vector vec = (Vector) listaSogg;
Object[] sogg = vec.toArray();
ScrSoggElenco newSogg =
new ScrSoggElenco(
(String) sogg[0],
(String) sogg[1],
(String) sogg[2],
(Timestamp) sogg[3],
(String) sogg[4],
(Timestamp) sogg[5],
(String) sogg[6],
(String) sogg[7],
(BigDecimal) sogg[8],
(Timestamp) sogg[9],
(String) sogg[10]
elenco.add(newSogg);
return elenco;