JPA Error with SDO_GEOMETRY conversion

Question

Attempted to perform a native SQL query which invokes
the Oracle SDO_UTIL.ELLIPSE_POLYGON() function within
a JPA context and got a ClassCastException. Here is code snippet:
try
javax.persistence.Query query = entityManager_.createNativeQuery(
"select SDO_UTIL.ELLIPSE_POLYGON( 32.4, 112.6, 1124.2, 992.4, 18.0, 5.0 ) from DUAL" );
oracle.sql.STRUCT obj = ( oracle.sql.STRUCT ) query.getSingleResult();
}catch( Exception e ) {}
When the query is executed this error occurs:
ERROR: java.lang.ClassCastException: org.eclipse.persistence.internal.helper.NonSynchronizedVector cannot be
cast to oracle.sql.STRUCT
NOTE: using Toplink 11G
Thanks ...
Edited by: user11177655 on Jul 22, 2009 12:45 PM

Answer 1

I assume you are getting back a List (Vector) with the Struct inside it. Try ((List)query.getSingleResult()).get(0).
In JPA you should get the Struct back directly if the result size was 1, otherwise an Object[], this was a bug in EclipseLink 1.0 that was fixed in EclipseLink 1.1.
You should probably upgrade to EclipseLink 1.1.
James : http://www.eclipselink.org