I would like to show an SMA indicator in the chart in JForex.
Could you please provide some sample code?
I could not find any sample in the forum or in the documentation.

I tried the following, but it does not work:

public void onStart(final IContext context) throws JFException {
indicators = context.getIndicators();
final IIndicator indicator = indicators.getIndicator("sma");
final IndicatorInfo indicatorInfo = indicator.getIndicatorInfo();
indicatorInfo.setOverChart(true);
final IIndicators.AppliedPrice medianPrice = IIndicators.AppliedPrice.MEDIAN_PRICE;
chart.addIndicator(indicator, new Object[]{INSTRUMENT, period, OfferSide.BID, medianPrice, 3, 0});
}

I get the following error:
16:31:39 Unexpected optional parameter [com.dukascopy.api.Instrument]=[GBP/JPY] for index [0]

Unfortunately JForex is closed source so I can not have a look at the code to see what the API wants me to do.
The documentation is insufficient at this point.

In SMA case there is one optional parameter - time period, so you add SMA indicator with optional input parameters in the following way:

int smaPeriod = 30;
chart.addIndicator(indicator, new Object[] { smaPeriod})

In general case you can check optional input parameters of an indicator by doing the following:

print("count: " + indicatorInfo.getNumberOfOptionalInputs());
for (int i = 0; i < indicatorInfo.getNumberOfOptionalInputs(); i++){
   print( i + ": name = '"+ indicator.getOptInputParameterInfo(i).getName()  + "' type = "+ indicator.getOptInputParameterInfo(i).getType());
}