[rules-users] Exception Handling in the rule

[Swindells, Thomas]

Firstly evals have to evaluate true or false - what you have here appears to return a string -
presumably you are actually comparing this to some value?

One, not particularly elegant or efficient method is to do the check within your eval, eg:

eval(ClaimsHistoryHelper.getClaimDrug(drugRefNo) == null ? false : drugName == (ClaimsHistoryHelper.getClaimDrug(drugRefNo)).getDrugName())

If your ClaimsHistoryHelper is doing a time consuming operation (eg going to a db  etc), you can probably make a very quick and simple efficiency saving by having it cache the last result it searched for/returned (or depending on how many drugRefNo you are looking up a more complete caching solution).

Thomas
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of sdinoo
> Sent: 07 June 2011 06:22
> To: rules-users at lists.jboss.org
> Subject: [rules-users] Exception Handling in the rule
>
> Hi,
>
> In my when clause I have an eval statement like this
>
> eval((ClaimsHistoryHelper.getClaimDrug(drugRefNo)).getDrugName())
>
> For some reason, there is no DrugRecord for the given drugRefNo and hence
> I get javaNullPointer exceptions I do want to rule to continue evaluation and
> not stop with the error and hence I dont want to handle exception at
> fireAllRules catch block
>
> How can I handle the exception in the DRL ?
>
>
>
>
>
> --
> View this message in context: http://drools.46999.n3.nabble.com/Exception-
> Handling-in-the-rule-tp3033223p3033223.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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