Dukascopy Support Board • View topic - IChartObjectFactory NullPointerException on backtest

nicofr0707

Hi,

I'm using IChartObjectFactory to draw rectangles on the chart.

In "visual mode" everything is fine, but if I backtest in normal mode or through
the optimizer, I have a java.lang.NullPointerException.

I presume I have the same issue by running in Remote mode because my
strategy doesn't take any trade (because of the exception I think, but
I can't check this since we can't access the log yet).

I use the following code :

myChartObject = chart.getChartObjectFactory().createRectangle();
myChartObject.setTime(0, creationTime);
myChartObject.setTime(1, __time2);
myChartObject.setPrice(0, __price1);
myChartObject.setPrice(1, __price2);
myChartObject.setAttrColor(IChartObject.ATTR_COLOR.COLOR, __color);
chart.addToMainChart(myChartObject);

Did I do something wrong ? I have this issue since a long time so I use
a boolean to disable chart drawing when I'm not running in visual mode.
But this is just a manual "Turn around"...

Thanks

API Support

Hi,
Please make sure chart isn't null:

if (chart != null){
...
}

And for chart not to be null it has to be opened. When you use visual mode chart is opened automatically.