import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.DriverManager;
import java.sql.Types;
import java.sql.SQLException;
import org.postgresql.PGStatement;

public class PreparedCastTest {
    public static void main(String[] args) {
        Connection c = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            c = DriverManager.getConnection(args[0], args[1], args[2]);
            ps = c.prepareStatement("select foo(?)");
            ( (PGStatement) ps ).setUseServerPrepare(true);
            //ps.setInt(1, 42);
            //ps.setObject(1, new Integer(42), Types.INTEGER);
            ps.setObject(1, null, Types.INTEGER);
            rs = ps.executeQuery();
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        } finally {
            if (rs != null) { try { rs.close(); } catch (Throwable t) {} }
            if (ps != null) { try { ps.close(); } catch (Throwable t) {} }
            if (c  != null) { try { c .close(); } catch (Throwable t) {} }
        }
    }
}