Hello,

Since the weekend I get a Null Pointer Exeption when a condition is fulfilled. I don't see a reason for this, as everything worked before.
I'm using a custom indicator ( nearly the same as the DMI).

This is the code in onBar():

    public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {
        if (instrument.equals(currentInstrument)) {
            ask = askBar.getClose();
            bid = bidBar.getClose();
            orderList = engine.getOrders(currentInstrument);  
            try {
                if (positionsTotal(instrument) < positionsAmount) {
                   
                    // Indikator
                    Integer[] optParams = new Integer[1];
                    optParams[0] = 21;
                    Object[] dmiNext = indicators.calculateIndicator(currentInstrument, indiPeriod, new OfferSide[]{OfferSide.BID}, "DMICustom", new IIndicators.AppliedPrice[]{IIndicators.AppliedPrice.TYPICAL_PRICE}, optParams, 0);
                    Object[] dmi = indicators.calculateIndicator(currentInstrument, indiPeriod, new OfferSide[]{OfferSide.BID}, "DMICustom", new IIndicators.AppliedPrice[]{IIndicators.AppliedPrice.TYPICAL_PRICE}, optParams, 1);
                    Object[] dmiPrev = indicators.calculateIndicator(currentInstrument, indiPeriod, new OfferSide[]{OfferSide.BID}, "DMICustom", new IIndicators.AppliedPrice[]{IIndicators.AppliedPrice.TYPICAL_PRICE}, optParams, 2);

                    double adx = (Double) dmi[0];
                    double dmiPlus = (Double) dmi[1];
                    double dmiMinus = (Double) dmi[2];

                    double adxPrev = (Double) dmiPrev[0];
                    double dmiPlusPrev = (Double) dmiPrev[1];
                    double dmiMinusPrev = (Double) dmiPrev[2];

                    double adxNext = (Double) dmiNext[0];
                    double dmiPlusNext = (Double) dmiNext[1];
                    double dmiMinusNext = (Double) dmiNext[2];
                    

                        if (dmiPlusPrev < dmiMinusPrev && dmiPlus > dmiMinus && dmiPlusNext > dmiMinusNext) {
                            
                                        console.getOut().print(" Crossed ");   //This is line 194
                                        (...)       

Error message:



- Tested on Historical Tester
- Platform cache and Java cache were cleaned before testing

I already searched for the reason, but I can't figure it out. Thanks for any suggestions

I tried to filter out the bars and call a different indicator.

Object[] values =  indicators.calculateIndicator(Instrument.EURUSD, Period.ONE_HOUR, new  OfferSide[] {OfferSide.ASK}, "DMI", 
             new AppliedPrice[] {}, new Object[]{14}, shift); 
console.getOut().println("adx: " + ((Object[])values)[0] + ", +di: " +
             ((Object[])values)[1] + ", -di: " + ((Object[])values)[2]);

Now the only code in onBar is the following:

    public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {
        if (!instrument.equals(Instrument.EURUSD) || !period.equals(Period.FIVE_MINS)) return; {
            ask = askBar.getClose();
            bid = bidBar.getClose();
            orderList = engine.getOrders(currentInstrument);  
            try {
                if (positionsTotal(instrument) < positionsAmount) {
                   
                  
             Object[] values =  indicators.calculateIndicator(Instrument.EURUSD, Period.FIVE_MINS, new  OfferSide[] {OfferSide.BID}, "DMI", 
             new IIndicators.AppliedPrice[] {IIndicators.AppliedPrice.CLOSE}, new Object[]{14}, 1); 
             
             console.getOut().println("adx: " + ((Object[])values)[0] + ", +di: " + ((Object[])values)[1] + ", -di: " + ((Object[])values)[2]);          
                   
                } else if ((positionsTotal(instrument) > 0)) {
                        // no instructions here
                }

            } catch (JFException ex) {
                ex.printStackTrace();
                System.out.println("Error : " + ex);
            } catch (java.lang.ArrayIndexOutOfBoundsException e) {
                e.printStackTrace();
                System.out.println("Error : " + e);
            }
        }

    }

I still get the same error
"2010-12-14 11:08:51 Strategy tester: java.lang.NullPointerException @ com.dukascopy.jforex.DMIScalper.onBar(DMIScalper.java:251)"

with line 251 being the print instruction.
What could be the origin of this error?

Hi,
DMI indicator has three outputs whereas ADX indicator has only one output.
Please have a look at the following code:

  double[] dmi =  indicators.dmi(instrument, period, OfferSide.ASK, 12, shift);        
  console.getOut().println("adx: " + dmi[0] + ", +di: " + dmi[1] + ", -di: " + dmi[2]);                
                
  long prevBarTime = history.getBar(instrument, period, OfferSide.ASK, shift).getTime();
  double[][] fromToDmi = indicators.dmi(instrument, period, OfferSide.ASK, 12, prevBarTime, prevBarTime);                
  console.getOut().println("adx: " + fromToDmi[0][0] + ", +di: " + fromToDmi[1][0] + ", -di: " + fromToDmi[2][0]);
        
  int candlesBefore = 1, candlesAfter = 0;
  double[][] filteredDmi = indicators.dmi(instrument, period, OfferSide.ASK, 12, Filter.NO_FILTER, candlesBefore, prevBarTime, candlesAfter);
  console.getOut().println("adx: " + filteredDmi[0][0] + ", +di: " + filteredDmi[1][0] + ", -di: " + filteredDmi[2][0]);        
        
  Object[] universalDmi = indicators.calculateIndicator(instrument, period, new  OfferSide[] {OfferSide.ASK}, "DMI",  
    new AppliedPrice[] {}, new Object[]{12}, Filter.NO_FILTER, 1, prevBarTime, 0);    
  console.getOut().println("adx: " + ((double[])universalDmi[0])[0] + ", +di: " + ((double[])universalDmi[1])[0] + ", -di: " + ((double[])universalDmi[2])[0]);