this bit of code is not working for me...

LENGTH {
public String toString() {return "Length";};
String eval(TypeSegregatedEntity e) {
Geometry g = e.getGeometry();
if (g instanceof SimpleGeometry) {
try {
return Double.toString(((SimpleGeometry) g).getLength()) + "\t";
}
catch (Exception ex) {
ex.printStackTrace();
}
}
return "\t";
}


does anyone know how to use instanceof in hibernate?

Use Hibernate.getClass(g), this will unwrap the Geometry instance, which may be proxied.