Hi, Below is the drl that I am using and the class that it is referring to: Drl: package rules.person import com.person.Age Import com.person.Classification rule "Check_person.option1" when $age : com.person.Age() $classification : com.person.Classification() eval ($age.getClassification("16")) then modify ($classification) {$classification.setResult('"Teenager"; } end rule "Check_person.option2" when $age : com.person.Age() $classification : com.person.Classification() eval ($age.getClassification("40")) then modify ($classification) {$classification.setResult('"Adult"; } end Application Class : public class Age { public string getClassification(String name) { <Logic of the application> return str; } } public class Classification { public void setResult(String name) { <Logic of the application> } } Queries : Please let me know if I am using the 'when' part correctly. And please check for the use of the object 'classification' in my application (as return value to the application) Thanks & Regards, Sumeet Karawal Mailto: sumeet.karawal(a)tcs.com From: Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; To: Rules Users List <rules-users(a)lists.jboss.org&gt; Date: 08/10/2011 03:03 PM Subject: Re: [rules-users] Calling a method in when part Sent by: rules-users-bounces(a)lists.jboss.org If you don't show your code we can't tell you what is wrong with it. So I think what you may have to do is when    $someObj: SomeClass()  # matches each WME of SomeClass    eval( $someObj.getValueBoolean("abc")) then There is not much to be gained by using a DRL function; it would have to be called like    eval( someFunction( $someObj, "abc" ) ) -W On 10 August 2011 11:05, Sumeet Karawal <sumeet.karawal(a)tcs.com&gt; wrote: Hi, I have a requirement where there is a customized Java class having a method that returns some value. like: getValueBoolean("Some String") { //some calculation   // returns a boolean value } The default getters and setters are not being used in the Application. The value that is being returned by the method needs to be checked in the .drl file. There are different Java classes with these kind of methods. Where the string and integer value is also returned. I have gone through the documentation for Drools-Expert but have only found the implementation for the method in the consequence part, i.e., the then part. This is how I tried: importing the class in when binding the a variable to the Class name suppose $c eval ($c.getValueBoolean("abc")) then System.out.println("the value is true") It didn't work this way. I tried by another way like : creating a function in the .drl itself that calls the method of that class and returns a value then calling this drl function in the when part and carrying on. It would be very helpful if some body could let me know how to do this in the .drl. Thanks & Regards, Sumeet Karawal Mailto: sumeet.karawal(a)tcs.com =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you _______________________________________________ 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

There are two things: 1. You want to call this method when a condition is satisfied 2. You want to check this condition and do something. If you want to do '1' when <<condition>> then boolean val = c.getValueBoolean("string"); end if you want to do '2' when eval(c.getValueBoolean("string")) then <<action>> end I am not sure what you want to do about of these two, hope this helps. If i have not understand your problem could you please provide more details will try to post solution. Regards, Sachin http://technologistics.blogspot.com/ -- View this message in context: http://drools.46999.n3.nabble.com/rules-users-Calling-a-method-in-when-pa... Sent from the Drools: User forum mailing list archive at Nabble.com.