[eclipselink-users] QueryException: Missing descriptor for [class java.s

[cowwoc <cowwoc@xxxxxxxxxxxxxxxx>]

Hi,

When I invoke:

Query query = em.get().createNativeQuery("select log from playlist_log as
log", Timestamp.class);
for (Object o: query.getResultList())
	System.out.println(o);

I get this exception on getResultList():

Exception [EclipseLink-6007] (Eclipse Persistence Services - 1.0.1 (Build
20080905)): org.eclipse.persistence.exceptions.QueryException
Exception Description: Missing descriptor for [class java.sql.Timestamp].
Query: ReadAllQuery(java.sql.Timestamp)
        at
org.eclipse.persistence.exceptions.QueryException.descriptorIsMissing(QueryException.java:417)
        at
org.eclipse.persistence.queries.ObjectLevelReadQuery.checkDescriptor(ObjectLevelReadQuery.java:546)
        at
org.eclipse.persistence.queries.ObjectLevelReadQuery.prePrepare(ObjectLevelReadQuery.java:1642)
        at
org.eclipse.persistence.queries.ObjectLevelReadQuery.checkPrePrepare(ObjectLevelReadQuery.java:632)
        at
org.eclipse.persistence.queries.ObjectLevelReadQuery.checkPrepare(ObjectLevelReadQuery.java:615)
        at
org.eclipse.persistence.queries.DatabaseQuery.checkPrepare(DatabaseQuery.java:429)
        at
org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:611)
        at
org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:840)
        at
org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:456)
        at
org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:902)
        at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2587)
        at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1178)
        at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1162)
        at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1136)
        at
org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1118)
        at
org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:399)
        at
org.eclipse.persistence.internal.jpa.EJBQueryImpl.getResultList(EJBQueryImpl.java:517)


Any ideas?

Gili
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