I have the following challenge. I need to automate strategy with non standard time frame ( 3 min, 2H, 8H ). For strategy to work properly I need to have access to 3min ema indicator.
In order to achieve it in my class declaration I wrote the following:

import java.util.*;

import com.dukascopy.api.*;
import com.dukascopy.api.feed.*;
import com.dukascopy.api.feed.util.*;
import com.dukascopy.api.IIndicators.AppliedPrice;

public class NeuralNetworkSniper implements IStrategy {
public Period period3Min = Period.createCustomPeriod(Unit.Minute, 3);

/*here goes onStart, onAccount, etc. functions*/

private double eMaValue(long period, long shift)throws JFException
{
double ema = indicators.ema(Instrument.EURUSD, period3Min , OfferSide.ASK, AppliedPrice.CLOSE, 5, shift);
return ema;
}
}

but when I try to compile I receive following error message:

2015-06-18 18:21:03 ----------
2015-06-18 18:21:03 The method ema(Instrument, Period, OfferSide, IIndicators.AppliedPrice, int, int) in the type IIndicators is not applicable for the arguments (Instrument, Period, OfferSide, IIndicators.AppliedPrice, int, long)
2015-06-18 18:21:03 ^^^
2015-06-18 18:21:03 double ema = indicators.ema(Instrument.EURUSD, period3Min , OfferSide.ASK, AppliedPrice.CLOSE, 5, shift);
2015-06-18 18:21:03 1. ERROR in C:\Users\yzaletskyy\AppData\Local\JForex\yzaletskyy\jfxide\tmp\compile\NeuralNetworkSniper.java (at line 123)
2015-06-18 18:21:03 ----------

does anybody knows how can I get needed information?

You need universal price feed to calculate indicator values on custom periods.
https://www.dukascopy.com/wiki/#Indicat ... price_feed

Here is how I solved it:

///Returns ema for period, with shift
private double eMaValue(int period, int shift)throws JFException
{
double ema = indicators.ema(currentInstrument, period3Min , OfferSide.ASK, AppliedPrice.CLOSE, period, shift);
return ema;
}