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

[Swindells, Thomas]

Have you got the stack trace, that may give a clue? Also what are the actual values of start date and end date?

Thomas


From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of dhari
Sent: 23 February 2010 11:30
To: rules-users at lists.jboss.org
Subject: Re: [rules-users] Comparing Date with || OR operator

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
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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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