JGeometry / oracle.jdbc.OracleDriver ClassCastException

Question

Hi-
I can't seem to store my JGeometry (from the SDO API) back to the database. The code that causes the problem is this:
===== Sample Code ========
import oracle.jdbc.OracleConnection;
OracleConnection oc = (OracleConnection) st.getConnection();
STRUCT struct = JGeometry.store((JGeometry)value,oc);
==========================
That last line of code throws this error:
===== Exception ============
05/01/04 16:50:26 [ERROR] ResultForm - Could not save the ResultBean <java.lang.ClassCastException>java.lang.ClassCastException
     at oracle.jdbc.driver.OracleConnection.unwrapCompletely(OracleConnection.java:5075)
     at oracle.jdbc.driver.OracleConnection.physicalConnectionWithin(OracleConnection.java:5126)
     at oracle.sql.TypeDescriptor.setPhysicalConnectionOf(TypeDescriptor.java:494)
     at oracle.sql.TypeDescriptor.<init>(TypeDescriptor.java:147)
     at oracle.sql.ArrayDescriptor.<init>(ArrayDescriptor.java:186)
     at oracle.sql.ArrayDescriptor.createDescriptor(ArrayDescriptor.java:118)
     at oracle.spatial.geometry.JGeometry.createDBDescriptors(JGeometry.java:1323)
     at oracle.spatial.geometry.JGeometry.store(JGeometry.java:1257)
     at gov.usgswim.wdnr.fishform.GeometryType.nullSafeSet(GeometryType.java:54)
=========================
It looks like the oracle.jdbc.driver.OracleConnection.unwrapCompletely method is assuming the connection to be something that it is not - but I'm stumped without the source code.
I've seen someone speculate that this is a classloader issue, but I'd have no idea how to resolve that within OC4J.
Here is my setup:
Running from JDev 9.0.5.2 using OC4J 9.0.5.
JDBC connections are provided via JNDI by specifying the datasource thru JDev. I've tried replacing the JDBC drivers that come with OC4J with the newer versions (that is, classes12.jar --> classes14.jar)
Database version is 10.1.0.3.0
I'm pretty much stuck until I can work this out, so any help would be appreciated.
Thanks in advance,
Eric Everman

Answer 1

Hi LJ - Thanks for the reply.
I'm leaving out detail about the framework I'm working within. For instance, the full method that saves the JGeometry back to the db is part of a Hibernate UserType for which I can't change the method signiture - thus the PreparedStatement.getConnection(). The full method looks like this:
=========== Java Method =================
public void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, SQLException {
STRUCT struct = null;
if (value != null) {
if (value instanceof JGeometry) {
JGeometry jg = (JGeometry)value;
System.out.println("Storing a Geom object to the db. Info:");
System.out.println(" Type: " + jg.getType());
System.out.println(" # of points: " + jg.getNumPoints());
System.out.println(" isPoint: " + jg.isPoint());
System.out.println(" X, Y: " + jg.getFirstPoint()[0] + ", " + jg.getFirstPoint()[1]);
//System.out.println(" elemInfo length: " + jg.getElemInfo().length); (throws error)
OracleConnection oc = (OracleConnection) st.getConnection();
struct = JGeometry.store(jg,oc);
} else {
throw new HibernateException("Cannot set GeometryType value to " + value.getClass().getName());
} //keep null value
st.setObject(index, struct);
==================================
==== Typical Output ==============
05/01/04 20:53:08 Storing a Geom object to the db. Info:
05/01/04 20:53:08 Type: 1
05/01/04 20:53:08 # of points: 1
05/01/04 20:53:08 isPoint: true
05/01/04 20:53:08 X, Y: 385343.3057, 562597.748
==================================
I've no reason to think that the connection I'd get from the prepared statement would be anything other then the connection returned from JNDI, but I'll try a simplified test to make sure.
My Geom is point data - would I expect JGeometry.getElemInfo() to return null in that case? Currently it does return null immediately after I load the JGeom from the database.