Hello,

I have a problem with custom indicator and maybe that's a bug...

I have MY first custom indicator e.g.:

public class FirstIndicator implements IIndicator {
  private IIndicatorContext context;
  private Period period;
  // ...

  public IndicatorResult calculate(...) {
      period = context.getFeedDescriptor().getPeriod();
// ...
   }
} 

and MY second custom indicator call the first one...

public class SecondIndicator implements IIndicator {
  private IIndicatorContext context;

  // ...

  public IndicatorResult calculate(...) {
      context.getIndicatorsProvider().getIndicator("First" [, context ]).calculate(...);

   }
}

Compiling is without error...

But when I launch the second indicator, there is a NullPointerException ...

And when I looked nearly where it occurs, as a result of it is in FirstIndicator when calculate method calls getFeedDescriptor(), so probably it is a null (alternatively getPeriod()).

And when I launch independently the first indicator, it all works correctly...

Regards
bojno

Hello Support,

I have the same problem.

I created a custom indicator wich calls IIndicatorContext.getFeedDescriptor().getPeriod().getInterval() in it's getLookback() method.
Also I have a second custom indicator which uses the first one.
When I'm calling IIndicatorContext.getIndicatorsProvider().getIndicator("First").getLookback() inside the getLookback() method of the second indicator, a NullPointerException is thrown.

Can you please provide a solution for this issue?

Regards
AbsoluteReturner

Hello bro,

I found a little work-around for this...

In the first indicator add an optional parameter e.g. "Period Interval" to the end of array of OptInputParameterInfo and in IndicatorInfo set parameter numberOfOptionalInputs = Optional Input Count - 1 (-1 hide the Period Interval (because of last), so you can't set it manually)...

And in the first indicator you must add some condition like:

int interval = 0;
if (IIndicatorContext.getFeedDescriptor() == null) {
    interval = optionalInputPeriodInterval;
} else {
    interval = IIndicatorContext.getFeedDescriptor().getPeriod().getInterval();
}

In the second indicator you must set firstIndicator.setOptInputParameter(Number of Period Interval, IIndicatorContext.getFeedDescriptor().getPeriod().getInterval()).

I hope this help you...

Regards
bojno