[rules-users] Nested properties and memberOf

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