[rules-users] Unable to create Field Extractor

[djerir smail]

Esteban Aliverti a écrit :
> Did you try using:
>
>        AlarmFailureEvent(
>            btsNumber == $BTS.number,
>            $ID : ID
>        )
>
> Note that btsNumber starts with a lowercase letter.
>
> Best,
>
> On Sun, May 30, 2010 at 9:04 PM, Djerir Smail <1983djerir at gmail.com 
> <mailto:1983djerir at gmail.com>> wrote:
>
>     Hello everybody,
>
>     *I need help please  **I am new in drools,  to start I am trying to
>     write some simple examples with drools fusion . I wrote a rule  which
>     print a message when an alarm is received multiple times during 20
>     minutes but i get this error
>     *
>         [java] Unable to create Field Extractor for 'BtsNumber' of
>     '[ClassObjectType event=com.mfe.casestudy.pojo.AlarmFailureEvent]' in
>     rule 'MaxBtsAlarmrule' : [Rule name='MaxBtsAlarmrule']
>         [java] java.lang.IllegalArgumentException: Could not parse
>     knowledge.
>         [java]     at
>     com.mfe.casestudy.test.Tester.prepareKnowledgeBase(Tester.java:73)
>         [java]     at com.mfe.casestudy.test.Tester.setUp(Tester.java:43)
>         [java]     at com.mfe.casestudy.test.Tester.main(Tester.java:87)
>         [java] Exception in thread "main" java.lang.NullPointerException
>         [java]     at
>     com.mfe.casestudy.test.Tester.prepareStatefulKnowledgeSession(Tester.java:58)
>         [java]     at com.mfe.casestudy.test.Tester.setUp(Tester.java:44)
>         [java]     at com.mfe.casestudy.test.Tester.main(Tester.java:87)
>         [java] Java Result: 1
>     main:
>
>
>     *This is my rule  it calculates  the number of alarms received
>     from one
>     BTS and if this number  exceeds the threshold it prints a warning
>     message *
>     rule "MaxBtsAlarmrule"
>     dialect "mvel"
>     no-loop true
>     salience 100
>     when
>        $BTS : BTS()
>
>        # check if the number of alarms of last 20 minutes exceeds
>        # the BTS threshold
>        $numOfAlarms : Number( intValue > $BTS.threshold )
>        from accumulate(
>            AlarmFailureEvent(
>                BtsNumber == $BTS.number,
>                $ID : ID
>            )
>            over window:time(3) from
>            entry-point BTSAlarmStream,
>            count($ID)
>        )
>
>
>     then
>      System.out.println("BTS should  be restarted...");
>
>     end
>
>     Finally this is the  alarm event class
>
>     public class AlarmFailureEvent implements Serializable {
>
>        /**
>         *
>         */
>        private static final long serialVersionUID = 1L;
>
>        public String BtsNumber = "";
>        private int code = 0;
>        private int ID=0;
>        public  AlarmFailureEvent(String BtsNumber, int code ,int ID) {
>            this.BtsNumber = BtsNumber;
>            this.ID=ID;
>            this.code=code;
>        }
>
>        public void setID(int iD) {
>            this.ID = iD;
>        }
>        public int getID() {
>            return this.ID;
>        }
>        public void setCode(int code) {
>            this.code = code;
>        }
>        public int getCode() {
>            return this.code;
>        }
>
>        public void setBtsNumber(String btsNumber) {
>            this.BtsNumber = btsNumber;
>        }
>
>        public String getBtsNumber() {
>            return BtsNumber;
>        }
>
>     }
>
>     *Thank you *
>     _______________________________________________
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>
>
>
>
> -- 
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
> ------------------------------------------------------------------------
>
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>   
Thank you I tryed btsNumber with lowercase  and it works now

Smail Djerir
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