Re: [rules-users] Nested properties and memberOf

Drools doesn't use short circuit evaluation, so all of those ORs are going to be evaluated. You may want to consider re-writing your rules or you can use MVEL's null safe navigation for this. dbtrAcct.?id == null, dbtrAcct.?id.?othr == nulll, etc. dave 2010/7/16 Meeraj Kunnumpurath <mkunnumpurath(a)googlemail.com&gt; > Hi, > > I have the following rules, > > global java.util.Set accountNumbers; > > rule "rule 1" > when > $d : Document() > $c : CreditTransferTransactionInformation (dbtrAcct == null || > dbtrAcct.id == null || dbtrAcct.id.othr == null || dbtrAcct.id.othr.id == > null) from $d.cstmrCdtTrfInitn.cdtTrfTxInf > $i : InternalInfo() from $c.internalInfo > then > $i.setStatus(PaymentStatus.INVALID); > $i.setErrorCode("PR002"); > $i.setAdditionalInfo("Account number is null"); > end > > rule "rule 2" > when > $d : Document() > $c : CreditTransferTransactionInformation(internalInfo.status != > PaymentStatus.INVALID && dbtrAcct.id.othr.id not memberOf accountNumbers) > from $d.cstmrCdtTrfInitn.cdtTrfTxInf > $i : InternalInfo() from $c.internalInfo > then > $i.setStatus(PaymentStatus.INVALID); > $i.setErrorCode("PR002"); > $i.setAdditionalInfo("Account number not available in the routing > table"); > end > > My assumption is rule 1 and rule 2 will be executed in the order they > appear. Rule 1 checks all the nested attributes are not null and set the > status as invalid if any of them is null. Rule 2 uses the and operator and > checks the nested attribute is in the collection defined by the global, only > if the object is valid. I assume the LHS of rule 2 will be short circuited > if the object is invalid. However, if any of the nested property is null I > get the following exception from MVEL. > > Caused by: [Error: unable to access property (null parent): id] > [Near : {... Unknown ....}] > ^ > [Line: 1, Column: 0] > at > org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:861) > > Regards > Meeraj > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users