What error do you get? On Aug 1, 11:06 am, Sap_junior <[email protected]> wrote: > Hello ! > > I have a problem with retriving objects by Key. I searched this error > in google , but didn't find any useful information about it. > > Here is the code: > > @PersistenceCapable > public class Marker { > @PrimaryKey > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) > private Key marker_id; > @Persistent > private String marker_name; > @Persistent > private Double marker_lat; > @Persistent > private Double marker_lng; > @Persistent > private String marker_address; > @Persistent > private String marker_content; > ..... > > } > > Here is the code of the servlet ( which must retrive an object and > delete) > > ....... > String marker_id_str = req.getParameter("marker_id").trim(); > Long marker_id = null; > > try{ > marker_id = Long.parseLong(marker_id_str.trim()); > } > > catch(Exception e){ > e.getStackTrace(); > } > ..... > Key k = null; > PersistenceManager pm = null; > try{ > k = KeyFactory.createKey(Marker.class.getSimpleName(), > marker_id); > //Long k = > Long.parseLong(req.getParameter("marker_id").trim()); > pm = PMF.get().getPersistenceManager(); > Marker marker = pm.getObjectById(Marker.class, k); > out.println(marker.getMarker_id() + marker.getMarker_name()); > //pm.deletePersistent(marker); > } > catch(Exception e){ > e.printStackTrace(); > } > finally{ > pm.close(); > } > ........ > > I get this error :
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