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Backtests fine, throws nullpointer error immediately live...
Forex_Monkey
 Post subject: Backtests fine, throws nullpointer error immediately live... Post rating: 0   New post Posted: Thu 20 Mar, 2014, 17:51 

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Joined: Thu 20 Mar, 2014, 15:13
Posts: 14
Location: United Kingdom,
Live account, JForex API Ver. 2.9.6.2

I've written a JForex Strategy (1-min EUR/USD) which backtests fine, any period, but when I try to run it live, at the end of the first 1-min bar it throws the exception shown in the attached image below.

With a bit of rearranging the order of the code, I have managed to get it to identify a line number in the onBar method, but this line has nothing to do with anything going on in the onMessage method...

Strange that it should work without problems in the historical tester though, no?

Anyone else had a problem like this / got any ideas?

Cheers!

Image


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tcsabina
 Post subject: Re: Backtests fine, throws nullpointer error immediately live... Post rating: 2   New post Posted: Fri 21 Mar, 2014, 12:55 
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Joined: Mon 08 Oct, 2012, 10:35
Posts: 676
Location: NetherlandsNetherlands
Without the source code, it is almost impossible to help,
especially with NPE...

If the code is confidential, try to create a simplified version of the strategy that is generating the same exception, and attach that one. Or contact send an email to support, attaching the strategy.
 
Forex_Monkey
 Post subject: Re: Backtests fine, throws nullpointer error immediately live... Post rating: 0   New post Posted: Fri 21 Mar, 2014, 13:09 

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Joined: Thu 20 Mar, 2014, 15:13
Posts: 14
Location: United Kingdom,
Yeah, cheers. That's kind of what I feared. I contacted tech support and they sent me here. The source code is huge, and it'll be a hell of a job to create a simplified version which throws the same error, but I guess that's what I'll have to do. Thanks anyway!
 
Forex_Monkey
 Post subject: Re: Backtests fine, throws nullpointer error immediately live... Post rating: 0   New post Posted: Tue 08 Apr, 2014, 10:01 

User rating: 1
Joined: Thu 20 Mar, 2014, 15:13
Posts: 14
Location: United Kingdom,
In case anyone was still wondering, my program made a false assumption... True in back-testing, but not in Live-mode :

That every message in the Istrategy.onMessage is order-related

Therefore, running live, some messages have

message.getOrder() = null

This was simply fixed by adding the following line at the beginning of onMessage :

if ( message.getOrder == null ) { return; }

Thanks for Dukascopy Support Team for quickly resolving this issue for me!
 
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