Hi, I am new to Drools and working with 4.0.1 version. I am playing with DSL and having trouble with conditional field constraints. I really appreciate any help, i like drools a lot and would love to use it. Here is the simple rule i have: rule "Credit Approved" salience 5 when //notice here we are using our own domain specific language that's defined within #credit.dsl file There is a person with #-must has a name -age is at least 18 years old then > System.out.println( "[ALLOW] Credit approved for " + person.getName()); end Here is my dsl definition: [when]There is a person with=person:Person() [when]-age is at least {age} years old=(age >= {age}) [when]-age is less than {age} years old=(age < {age}) [when]-must has a name=(name != "" && name != null) [when]-id must be positive integer=id > 0 Everything works fine if i use only 'age is least 18 years old' or 'must has a name'. However, if i try to do a connective and between these two constraints, i am getting package build errors: Package build error found: [13,43]: unknown:13:43 mismatched token: [@59,331:331=',',<11>,13:43]; expecting type RIGHT_PAREN[13,59]: unknown:13:59 mismatched token: [@71,347:347=')',<12>,13:59]; expecting type THEN Exception in thread "main" org.drools.rule.InvalidRulePackage: [13,43]: unknown:13:43 mismatched token: [@59,331:331=',',<11>,13:43]; expecting type RIGHT_PAREN[13,59]: unknown:13:59 mismatched token: [@71,347:347=')',<12>,13:59]; expecting type THEN at org.drools.rule.Package.checkValidity(Package.java:419) at org.drools.common.AbstractRuleBase.addPackage ( AbstractRuleBase.java:292) at com.trg.play.rules.PersonTest.readRule(PersonTest.java:103) at com.trg.play.rules.PersonTest.main(PersonTest.java:51) I have attached my test program for your review.

Hi Andy Mei, In your DSL file you put some parentheses. I think it's the problem. Try with this : > [when]There is a person with=person:Person() > [when]-age is at least {age} years old=age >= {age} > [when]-age is less than {age} years old=age < {age} > [when]-must has a name=name != "" && name != null > [when]-id must be positive integer=id > 0 Good luck, vdelbart -- View this message in context: http://www.nabble.com/DSL-field-constraint-question-tf4360996.html#a12457145 Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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