I'm testing indicators with periods other than the selected chart timeframe. As input I'm passing bars with the timeframe being passed by an optional parameter.
I now experience that calculate is being called with endIndex > inputs.length when adding the indicator to a chart.
The error even shows up when setting the optional period parameter to the same value as the selected period on the chart.

The start of calculate reads as follows:

    public IndicatorResult calculate(int startIndex, int endIndex) {
        //calculating startIndex taking into account lookback value
        if (startIndex - getLookback() < 0) {
            startIndex -= startIndex - getLookback();
        }
        if (startIndex >= endIndex || inputs[0].length < endIndex) {
           context.getConsole().getOut().println("Testindicator.log: index/inputs-arraysize problem: startIdx/endIdx=" + startIndex + "/" + endIndex + ", inputs.length=" + inputs[0].length);
            return new IndicatorResult(0, 0);
        }

        ....

The indicator is producing the following log messages. You can see, that the DukasCopy error message states that the input array size = 4000, which it clearly isn't (length=142...).



I've attached the test code.

I guess this a bug?
Or am I missing something here?

Any feedback is highly appreciated.
Thanks & best, RR.

Have a look at the following: https://www.dukascopy.com/wiki/index.php?title=Indicator_with_multiple_inputs
"Indicators always have at least one input (main input). Main input's instrument, period and offer side are chart's instrument, period and offer side. Even if the main input wasn't defined in the indicator, it still exists. Indicator's calculate method receives indexes (startIndex and endIndex ) for this main input." That is why input synchronization is required.

In order to see the full picture:
Add one more input with default everything as follows:
...

 inputParameterInfos = new InputParameterInfo[] { 
                 barInput, 
                 new InputParameterInfo("Default input", InputParameterInfo.Type.BAR) 
         }; 

...
Add additional debug messages:
...

 if (startIndex >= endIndex || inputs[0].length < endIndex) { 
          context.getConsole().getOut().println("main input's length: " + inputs[1].length); 
          context.getConsole().getOut().println("Testindicator: index/inputs-arraysize problem: startIdx/endIdx=" + startIndex + "/" + endIndex + ", inputs.length=" + inputs[0].length); 
             return new IndicatorResult(0, 0); 
         } 

...