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Not simple. If you know all possible Classes that extend BaseModel, you can test with the instanceof all possible Cases.
For Example:


if (this instanceof Person) ...

Use following Code:


package schachfiguren;
import java.net.*;
public class Locator
{
public URL getURL(String pfad)
{
URL url = this.getClass().getResource(pfad);

I think it must be:


double cost = Double.parseDouble(coststring).doubleValue();

I had the same Error some Time ago, but only with the 8... JDBC Driver Series. I use now an older JDBC Driver 5... This is a workaround for me. But I did not understand the Problem.