[rules-users] Comparing Date with || OR operator

[Wolfgang Laun]

Please try this rewrite of the 2nd CE:
   Segment ( $endDate : endDate, startDate < $regDate || startDate > $endDate )
and report the outcome to the list, together with the Dools version
you are using.
Thank you.


2010/2/23 dhari <sdhari at hotmail.com>:
> Hi Thomas
>
> Thanks your prompt reply. I am sure all three attributes are NOT null. I
> have tested them before sending question to mailing list. If you want, I can
> send complete sample code and you can try it at your end.
>
> Regards,
> Dhari
>
>
> ________________________________
> Date: Tue, 23 Feb 2010 02:50:08 -0800
> From: [hidden email]
> To: [hidden email]
> Subject: Re: Comparing Date with || OR operator
>
> If it works fine with an and operator then I’d imagine that startDate <
> $regDate returns false, with an && this would abort evaluation immediately
> but with an or it would mean that startDate > endDate is evaluated and so
> presumably it is this bit that is throwing the NPE.  I’d imagine that the
> most likely reason for this would be that endDate is null.
>
>
>
> Try changing it too
>
> Segment ( startDate < $regDate || (endDate != null && startDate > endDate) )
>
> And see whether you loose the NPE.
>
>
>
> Thomas
>
>
>
> From: [hidden email] [mailto:[hidden email]] On Behalf Of dhari
> Sent: 23 February 2010 06:15
> To: [hidden email]
> Subject: [rules-users] Comparing Date with || OR operator
>
>
>
> The following code generates NPE in ReteTuple.java
>
> rule
>
>        when
>
>               Membership ( $regDate : regDate)
>
>               Segment ( startDate < $regDate || startDate > endDate )
>
>         then
>
>             System.err.print(“Invalid start date”);
>
> end
>
> I am new in Drools and don’t know much about DRL scripting. It works fine I
> use && operator instead.
>
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