Did you try using:<div><br></div><div><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; "> AlarmFailureEvent(<br> btsNumber == $BTS.number,<br>
$ID : ID<br> )</span></div><div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"><br></span></font></div><div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;">Note that btsNumber starts with a lowercase letter.</span></font></div>
<div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"><br></span></font></div><div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;">Best,<br>
</span></font><br><div class="gmail_quote">On Sun, May 30, 2010 at 9:04 PM, Djerir Smail <span dir="ltr"><<a href="mailto:1983djerir@gmail.com">1983djerir@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello everybody,<br>
<br>
*I need help please **I am new in drools, to start I am trying to<br>
write some simple examples with drools fusion . I wrote a rule which<br>
print a message when an alarm is received multiple times during 20<br>
minutes but i get this error<br>
*<br>
[java] Unable to create Field Extractor for 'BtsNumber' of<br>
'[ClassObjectType event=com.mfe.casestudy.pojo.AlarmFailureEvent]' in<br>
rule 'MaxBtsAlarmrule' : [Rule name='MaxBtsAlarmrule']<br>
[java] java.lang.IllegalArgumentException: Could not parse knowledge.<br>
[java] at<br>
com.mfe.casestudy.test.Tester.prepareKnowledgeBase(Tester.java:73)<br>
[java] at com.mfe.casestudy.test.Tester.setUp(Tester.java:43)<br>
[java] at com.mfe.casestudy.test.Tester.main(Tester.java:87)<br>
[java] Exception in thread "main" java.lang.NullPointerException<br>
[java] at<br>
com.mfe.casestudy.test.Tester.prepareStatefulKnowledgeSession(Tester.java:58)<br>
[java] at com.mfe.casestudy.test.Tester.setUp(Tester.java:44)<br>
[java] at com.mfe.casestudy.test.Tester.main(Tester.java:87)<br>
[java] Java Result: 1<br>
main:<br>
<br>
<br>
*This is my rule it calculates the number of alarms received from one<br>
BTS and if this number exceeds the threshold it prints a warning message *<br>
rule "MaxBtsAlarmrule"<br>
dialect "mvel"<br>
no-loop true<br>
salience 100<br>
when<br>
$BTS : BTS()<br>
<br>
# check if the number of alarms of last 20 minutes exceeds<br>
# the BTS threshold<br>
$numOfAlarms : Number( intValue > $BTS.threshold )<br>
from accumulate(<br>
AlarmFailureEvent(<br>
BtsNumber == $BTS.number,<br>
$ID : ID<br>
)<br>
over window:time(3) from<br>
entry-point BTSAlarmStream,<br>
count($ID)<br>
)<br>
<br>
<br>
then<br>
System.out.println("BTS should be restarted...");<br>
<br>
end<br>
<br>
Finally this is the alarm event class<br>
<br>
public class AlarmFailureEvent implements Serializable {<br>
<br>
/**<br>
*<br>
*/<br>
private static final long serialVersionUID = 1L;<br>
<br>
public String BtsNumber = "";<br>
private int code = 0;<br>
private int ID=0;<br>
public AlarmFailureEvent(String BtsNumber, int code ,int ID) {<br>
this.BtsNumber = BtsNumber;<br>
this.ID=ID;<br>
this.code=code;<br>
}<br>
<br>
public void setID(int iD) {<br>
this.ID = iD;<br>
}<br>
public int getID() {<br>
return this.ID;<br>
}<br>
public void setCode(int code) {<br>
this.code = code;<br>
}<br>
public int getCode() {<br>
return this.code;<br>
}<br>
<br>
public void setBtsNumber(String btsNumber) {<br>
this.BtsNumber = btsNumber;<br>
}<br>
<br>
public String getBtsNumber() {<br>
return BtsNumber;<br>
}<br>
<br>
}<br>
<br>
*Thank you *<br>
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</blockquote></div><br><br clear="all"><br>-- <br>XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX<br><br>Esteban Aliverti<br>
</div>