Hello,
i want to create my own BUY/SELL Button in a BottomTab but when i click my Button i get an Exception @ submitOrder() Function.
If i call submitOrder() in the onStart() Function it works just fine.

Here is a simple Strategy that shows the Problem.

Orders must be placed from the context of functions of IStrategy interface or functions that are called by them.
Orders cannot be placed from separate threads including user interface elements.

package jforex.guitests;

import javax.swing.*;

import com.dukascopy.api.*;
import java.awt.Container;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class TickCountingComponent implements IStrategy {
    private IUserInterface userInterface;
    private IContext context;

    private final String tabName = "TickCounter";
    boolean buy = false;

    public void onStart(IContext context) throws JFException {
        this.userInterface = context.getUserInterface();
        this.context = context;

        JPanel tab = userInterface.getBottomTab(tabName);
        
        addComponentsToPane(tab);
        
        //Buy();    // works fine
    }

    private void addComponentsToPane(Container pane) {

        pane.setLayout(null);

        final JButton btn = new JButton("BUY");

        pane.add(btn);

        btn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                buy = true;
                //Buy();    // throws Exception @ engine.submitOrder();
            }
        });

        //customized size and placement of the button
        Insets insets = pane.getInsets();
        btn.setBounds(25 + insets.left, 5 + insets.top, 100, 25);
    }

    public void onTick(Instrument instrument, ITick tick) throws JFException {
        if(buy) {
            Buy();
            buy = false;
        }
    }

    public void onStop() throws JFException {
        userInterface.removeBottomTab(tabName);    //remove tab
    }

    public void onAccount(IAccount account) throws JFException {
    }

    public void onMessage(IMessage message) throws JFException {
    }

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

    private void Buy()
    {
        try{ context.getEngine().submitOrder("longEntry", Instrument.EURUSD, IEngine.OrderCommand.BUY, 0.001);}
        catch (JFException e)
        {
            context.getConsole().getOut().println("   -> JFException @ engine.submitOrder();");

            e.printStackTrace();
        }
    }
}

As i feared. I am now using a boolean Flag.
Is there any method to send a simulated Tick to JForex so that the onTick() Method gets called immediately from the System?
Otherwiese i have to wait until next Tick and that could result to a different Price...

Thanks for your Help so far.

package jforex.guitests;

import javax.swing.*;

import com.dukascopy.api.*;
import com.dukascopy.api.IEngine.OrderCommand;
import java.awt.Container;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.concurrent.Callable;

public class TickCountingComponent implements IStrategy {

    private IUserInterface userInterface;
    private IContext context;
    private final String tabName = "TickCounter";
    boolean buy = false;
    private IEngine engine;
    private IHistory history;

    public void onStart(IContext context) throws JFException {
        this.userInterface = context.getUserInterface();
        this.context = context;
        this.engine = engine;
        this.history = context.getHistory();

        JPanel tab = userInterface.getBottomTab(tabName);

        addComponentsToPane(tab);
    }

    private void addComponentsToPane(Container pane) {

        pane.setLayout(null);

        final JButton btn = new JButton("BUY");

        pane.add(btn);

        btn.addActionListener(new BuyAction(context, Instrument.EURUSD));

        //customized size and placement of the button
        Insets insets = pane.getInsets();
        btn.setBounds(25 + insets.left, 5 + insets.top, 100, 25);
    }
    
    class BuyAction implements ActionListener, Callable<Object> {
        
        final IContext context;
        Instrument instrument;
        
        BuyAction(IContext context, Instrument instrument) {
            this.context = context;
            this.instrument = instrument;
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            try {
                context.executeTask(this);
            } catch (Exception ex) {
                context.getConsole().getErr().println(Thread.currentThread().getName() + " " + ex);
            }
        }
          
        @Override
        public Object call() throws Exception {
            return context.getEngine().submitOrder("longEntry", instrument, IEngine.OrderCommand.BUY, 0.001);
        }
    }

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

    public void onStop() throws JFException {
        userInterface.removeBottomTab(tabName);    //remove tab
    }

    public void onAccount(IAccount account) throws JFException {
    }

    public void onMessage(IMessage message) throws JFException {
    }

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


}

Also see: https://www.dukascopy.com/wiki/#Threading