I try to use the CCI indicator in my custom indicator.

IIndicatorsProvider indicatorsProvider = context.getIndicatorsProvider();
      cci = indicatorsProvider.getIndicator("CCI");

....

cci.setInputParameter(0, inputs[0]);

But I only get a "13:44:32 Error in indicator: java.lang.ClassCastException" message. What I am doing wrong? Where is the CCI indicator defined?

Thanks for your support.

You are passing a wrong input type.
The indicator is not published in the API, meaning that its source is not accessible. However, you can find out its inputs and outputs in the following way:

    public void onStart(IIndicatorContext context) {  
        //(..)
        IIndicator cci = context.getIndicatorsProvider().getIndicator("CCI");
        printIndicatorInfos(cci);
    }
    private void print(Object o){
       console.getOut().println(o);
    }
    
    private void printIndicatorInfos(IIndicator ind){
        for (int i = 0; i < ind.getIndicatorInfo().getNumberOfInputs(); i++){
           print(ind.getIndicatorInfo().getName() +" Input " + ind.getInputParameterInfo(i).getName() +" " + ind.getInputParameterInfo(i).getType());
        }
        for (int i = 0; i < ind.getIndicatorInfo().getNumberOfOptionalInputs(); i++){
           print(ind.getIndicatorInfo().getName() +" Opt Input " + ind.getOptInputParameterInfo(i).getName() +" " + ind.getOptInputParameterInfo(i).getType());
        }
        for (int i = 0; i < ind.getIndicatorInfo().getNumberOfOutputs(); i++){
           print(ind.getIndicatorInfo().getName() +" Output " + ind.getOutputParameterInfo(i).getName() +" " + ind.getOutputParameterInfo(i).getType());
        }
    }

Thanks for your help. Will try this later.

Ok. Fixed it ... The input parameters were wrong. CCI expects a HLC price instead of a double array.

private double[][][] inputs = new double[1][][]; // HLC price


public void onStart(IIndicatorContext context) {            
   
      
      IIndicatorsProvider indicatorsProvider = context.getIndicatorsProvider();
      cci = indicatorsProvider.getIndicator("CCI");
      printIndicatorInfos(cci);
   
...

      inputParameterInfos = new InputParameterInfo[] {new InputParameterInfo("Price", InputParameterInfo.Type.PRICE)};

      .....
   }


public IndicatorResult calculate(int startIndex, int endIndex) {        
   if (startIndex - getLookback() < 0) {
           startIndex -= startIndex - getLookback();
        }
        if (startIndex > endIndex) {
            return new IndicatorResult(0, 0);
        }
        
        double[] dcci = new double[endIndex - startIndex + cci.getLookback()+1];

      cci.setInputParameter(0, inputs[0]);
      cci.setOutputParameter(0, dcci);
      IndicatorResult rsiResult = cci.calculate(startIndex-filter.getLookback(), endIndex);
      

   }

...

Thanks again for your quick response.

Yours
forexhero