Missing descriptor for class ...

Question

I have this code to query (using SQLCall)
Session session = TopLinkSession.getSession();
     SQLCall call = new SQLCall("select c_pays_fonds from TDT31_UEB where no_cli=#no_cli");
     ReadObjectQuery query = new ReadObjectQuery(Tdt31Ueb.class);
     query.setCall(call);
     query.addArgument("no_cli");
     query.bindAllParameters();
     Vector arguments = new Vector();
     arguments.add(getCompte().getClientGarant().getNoCli());
     result = (Tdt31Ueb) session.executeQuery(query, arguments);
session.release();
When running, i have the error :
EXCEPTION [TOPLINK-6007] (TopLink - 9.0.3.4 (Build 432)): oracle.toplink.exceptions.QueryException
EXCEPTION DESCRIPTION: Missing descriptor for [class com.bnpparibas.bfi.ebo.atlas.dto.Tdt31Ueb].
QUERY: ReadObjectQuery(com.bnpparibas.bfi.ebo.atlas.dto.Tdt31Ueb)
     at oracle.toplink.exceptions.QueryException.descriptorIsMissing(Unknown Source)
     at oracle.toplink.queryframework.ObjectLevelReadQuery.checkDescriptor(Unknown Source)
     at oracle.toplink.queryframework.ReadObjectQuery.checkEarlyReturn(Unknown Source)
     at oracle.toplink.queryframework.DatabaseQuery.execute(Unknown Source)
     at oracle.toplink.queryframework.ReadQuery.execute(Unknown Source)
     at oracle.toplink.publicinterface.Session.internalExecuteQuery(Unknown Source)
     at oracle.toplink.publicinterface.Session.executeQuery(Unknown Source)
     at oracle.toplink.publicinterface.Session.executeQuery(Unknown Source)
     at com.bnpparibas.bfi.fmk.server.toplink.FmkDatabaseSession.executeQuery(Unknown Source)
     at com.bnpparibas.bfi.ebo.atlas.rg.EboRG032.getValue(EboRG032.java:38)
     at com.bnpparibas.bfi.eau.atlas.extracteur.ExtracteurStructure.extrait(Unknown Source)
     at com.bnpparibas.bfi.ebo.atlas.extracteur.ExtracteurGarantie.extraitGarantie(Unknown Source)
     at com.bnpparibas.bfi.ebo.atlas.extracteur.ExtracteurGarantie.extrait(Unknown Source)
     at com.bnpparibas.bfi.ebo.atlas.exe.ExtractionGarantie.execute(Unknown Source)
     at com.bnpparibas.bfi.ebo.atlas.exe.ExtractionGarantie.main(Unknown Source)
Any idea?
Laurent

Answer 1

There are a couple of possibilities that come to mind not knowing all the details of your code.
One, are you getting the session that has a descriptor defined for your class Tdt31Ueb? You may have more than one session defined and you aren't getting the right one.
Two, you're getting the right session but you either haven't defined a descriptor for Tdt31Ueb or you haven't exported an up to date project.xml from the Workbench (if you're using it). In JDeveloper the project.xml is automatically regenerated when you build your project so this isn't a problem in that environment.
Even if you use a SQLCall, TopLink needs a descriptor with mappings for your class so it know how to map all of the fields of your objects to the result set returned from the query.
--Shaun