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Help with null pointer exception when changing input types
JHogg11
 Post subject: Help with null pointer exception when changing input types Post rating: 0   New post Posted: Mon 13 Jun, 2011, 03:17 

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Joined: Fri 10 Jun, 2011, 14:54
Posts: 11
Location: United States,
I'm new to Java, so I'm starting slow, working piece by piece. I tried to change the simple indicator using the pre-made code to use the PRICE input type and I got this error.

00:39:11 Error in indicator: java.lang.NullPointerException @ jforex.Indicator2.calculate(Indicator2.java:33)

These are the only changes I made to the simple indicator.

Line 10: Changed from "new double[1][]" to "new double[5][]"
Line 17: Changed to PRICE type
Line 33: Changed "inputs[0][i - k];" to "inputs[1][i - k];"
Line 74: Changed to "double[][] inputs = (double[][]) array;" which I got from another thread

What do I need to do to get this to work the same way as the default simple indicator works but using the PRICE type?
 
API Support
 Post subject: Re: Help with null pointer exception when changing input typ Post rating: 0   New post Posted: Mon 13 Jun, 2011, 15:39 
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Joined: Fri 31 Aug, 2007, 09:17
Posts: 6139
Essentially InputParameterInfo.Type.PRICE is an array of type double[][] whereas InputParameterInfo.Type.DOUBLE is of type double[]. See:
https://www.dukascopy.com/wiki/index.php ... ameterInfo
For a simple indicator with InputParameterInfo.Type.PRICE see:
viewtopic.php?f=52&t=34656
 
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