Hi,
I have a problem when trying to query on the appengine. here's what I do:
Query q = persistenceManager.newQuery(User.class);
q.declareParameters("java.lang.String emailParam");
q.setFilter("userEmail == emailParam");
List<User> list = (List<User>) q.execute(email);
if (list.size()<=0) ( OR if (list.isEmpty()))
And I get this exception:
java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String
at
org.datanucleus.store.appengine.DatastoreFieldManager.fetchStringField(DatastoreFieldManager.java:207)
at
org.datanucleus.state.AbstractStateManager.replacingStringField(AbstractStateManager.java:1180)
at com.logos.stm.shared.model.User.jdoReplaceField(User.java)
at com.logos.stm.shared.model.User.jdoReplaceFields(User.java)
at
org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2772)
at
org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2791)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject(DatastorePersistenceHandler.java:480)
at
org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo(DatastoreQuery.java:570)
at
org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo(DatastoreQuery.java:525)
at
org.datanucleus.store.appengine.query.DatastoreQuery.access$300(DatastoreQuery.java:111)
at
org.datanucleus.store.appengine.query.DatastoreQuery$6.apply(DatastoreQuery.java:643)
at
org.datanucleus.store.appengine.query.DatastoreQuery$6.apply(DatastoreQuery.java:635)
at
org.datanucleus.store.appengine.query.LazyResult.resolveNext(LazyResult.java:94)
at
org.datanucleus.store.appengine.query.LazyResult.resolveAll(LazyResult.java:116)
at
org.datanucleus.store.appengine.query.LazyResult.size(LazyResult.java:110)
at
org.datanucleus.store.appengine.query.StreamingQueryResult.size(StreamingQueryResult.java:130)
The error occurs on the if (list.size()<=0) OR if (list.isEmpty()) in both
cases. My User class is declared as followed:
@PersistenceCapable(identityType=IdentityType.APPLICATION)
public class User implements Serializable {
...
@Persistent
String userEmail;
+getter and setter
Can someone explain I have this error?
Thanks a lot!
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