To save configurable parameters to the file, run your strategy with configurable parameters and then save preset with specified name:

Parameters will be saved in your strategies path directory in xml format.

The example below reads configurable parameters from xml file "Parameters.xml" stored on C disk and creates a Buy Limit order with specified instrument, price and take profit.

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.dukascopy.api.*;
import com.dukascopy.api.IEngine.OrderCommand;

@RequiresFullAccess
public class ParametersInXml implements IStrategy {
        private IEngine engine;
        private IConsole console;

        public Instrument selectedInstrument;
        public double price     ;
        public double takeProfit;

        public void onStart(IContext context) throws JFException {
                this.engine = context.getEngine();
                this.console = context.getConsole();
                parseFile("C:\\Parameters.xml");
                engine.submitOrder("Order1", selectedInstrument, OrderCommand.BUYLIMIT, 0.01,price, 0, 0, takeProfit);
        }

        public void onAccount(IAccount account) throws JFException {
        }

        public void onMessage(IMessage message) throws JFException {
        }

        public void onStop() throws JFException {
                for (IOrder order : engine.getOrders()) {
                        engine.getOrder(order.getLabel()).close();
                }
        }

        public void onTick(Instrument instrument, ITick tick) throws JFException {
        }

        public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {
    }

Method parseFile find all variable tags and parse inner tag name and value. After parsing necessary tag we initialize ParametersInXml class fields

   public void parseFile(String fileName) {
                try {
                        File file = new File(fileName);
                        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
                        DocumentBuilder db = dbf.newDocumentBuilder();
                        Document doc = db.parse(file);
                        doc.getDocumentElement().normalize();
                        NodeList nodeList = doc.getElementsByTagName("variable");
                        <b>Bold text</b>
                       // Call initializeVariable method with all variable xml nodes 
                        for (int count = 0; count < nodeList.getLength(); count++) {
                                Node node = nodeList.item(count);
                                if (node.getNodeType() == Node.ELEMENT_NODE) {
                                        Element element = (Element) node;
                                        NodeList nameTag = element.getElementsByTagName("name");
                                        Element variableName = (Element) nameTag.item(0);
                                        NodeList name = variableName.getChildNodes();
                                        NodeList valueTag = element.getElementsByTagName("value");
                                        Element variableValue = (Element) valueTag.item(0);
                                        NodeList value = variableValue.getChildNodes();
                                        initializeVariable(name.item(0).getNodeValue(), value.item(0).getNodeValue());
                                }
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                }
        }

Method initializeVariable initializes variable if xml node name match with necessary order parameters (instrument, price and take profit)

        private void initializeVariable(String nameNode, String valueNode) {
                if (nameNode.equals("selectedInstrument")) {
                        selectedInstrument = Instrument.fromString(valueNode);
                } 
                if (nameNode.equals("takeProfit")) {
                        takeProfit = Double.valueOf(valueNode);
                }
                if (nameNode.equals("price")) {
                        price = Double.valueOf(valueNode);
                }
        }
}

ParametersInXml.java