I'm trying to write a couple of indicators that have only one OptInputParameterInfo.

If I use an array
e.g. private OptInputParameterInfo[] optInputParameterInfos;

public OptInputParameterInfo getOptInputParameterInfo(int index) {
if (index <= optInputParameterInfos.length) {
return optInputParameterInfos[index];
}
return null;
}

the code throws an exception when the indicator is attached to the chart
(11:48:09 Exception while validating indicator: java.lang.ArrayIndexOutOfBoundsException: 1 @ com.dukascopy.indicators.Wave.getOptInputParameterInfo(Wave.java:112)

If I use an object
e.g. private OptInputParameterInfo optInputParameterInfos;

with
public OptInputParameterInfo getOptInputParameterInfo(int index) {
return optInputParameterInfos;
}

I get Array Index out of bounds : 1 error when the indicator is validated.

what is the recommended way of handling only one optional input parameter?

Hi!
Maybe numberOfOptionalInputs set to 0 in IndicatorInfo?
In your case it should be equal to 1

Set to 1 already, so that's not the issue. But thanks!