SQLData, PostgreSQL and typemap woes

Hi,

we're currently trying to evaluate PostgreSQL as an Object Storage, using the JDBC SQLData interface. We're using the
PostgreSQLprovided tutorial UDT Complex and we're trying to instantiate a Java Complex class with it.  
Here's what we're trying to do:

java.util.Map map = dbConnection.getTypeMap();
map.put("complex",
Class.forName("Complex"));
dbConnection.setTypeMap(map);

map = dbConnection.getTypeMap();

Statement stmt = dbConnection.createStatement();
ResultSet rs = stmt.executeQuery("SELECT cp FROM complex_test WHERE id=1");
rs.next();
ResultSetMetaData metaData = rs.getMetaData();
System.out.println("Type from SQL: " + metaData.getColumnTypeName(1));

Object foo = rs.getObject(1);

if (foo instanceof Complex) {
Complex cp = (Complex)foo;
System.out.println("Got: " + cp + " from DB");
}
else {
System.out.println("Class name: " + foo.getClass().getName());
System.out.println("Got " + foo);
}
stmt.close();

The above mentioned code always returns a java.lang.String instance, which makes us believe that the type map is
incorrect. 

The name of the logical database is 'server', the table name is 'complex_test'. Here's the table definition:
server=# \d complex_test
Table "complex_test"
Column | Type | Modifiers
--------+---------+-----------
id | integer |
cp | complex |

server=# select * from complex_test;
id | cp
----+---------
1 | (55,33)

We're using jxDBCon (http://sourceforge.net/projects/jxdbcon) PostgreSQL
JDBC driver.

Cheers,
Jon & Jens