[rules-users] NullPointerException when using Drools rule template

[Roger Smith]

Wolfgang,

I have enclosed the template. For debugging purpose, I have removed all but
one rule.

Thanks,

Roger


- O -

template header
summerOnPeakPrimaryRate
summerOnPeakSecondaryRate
summerSemiPeakPrimaryRate
summerSemiPeakSecondaryRate
summerOffPeakPrimaryRate
summerOffPeakSecondaryRate
winterOnPeakPrimaryRate
winterOnPeakSecondaryRate
winterSemiPeakPrimaryRate
winterSemiPeakSecondaryRate
winterOffPeakPrimaryRate
winterOffPeakSecondaryRate

package tradex.contract.sde

import tradex.process.ruler.server.ContractRule

rule "holiday july 4th"
when
  $r : ContractRule( year == 2010 && month == 7 && day == 4 && holiday ==
false)
then
  modify($r){
    setHoliday(true)
  }
end

rule "holiday xmas"
when
  $r : ContractRule( year == 2010 && month == 12 && day == 25 && holiday ==
false)
then
  modify($r){
    setHoliday(true)
  }
end

rule "Season summer"
when
  $r : ContractRule( dayOfYear >= 121 && dayOfYear <= 273 && season ==
"undefined")
then
  modify($r){
    setSeason("summer")
  }
end

rule "Season winter"
when
  $r : ContractRule( (dayOfYear >= 274 || dayOfYear <= 120) && season ==
"undefined")
then
  modify($r){
    setSeason("winter")
  }
end


rule "On peak hour"
when
  $r : ContractRule( holiday == false && dayOfWeek >= 1 && dayOfWeek <= 6
&& hourOfDay >= 1400 && hourOfDay <= 2000 &&
  hourType == "undefined")
then
  modify($r){
    setHourType("onPeak")
  }

end

rule "Semi peak hour"
when
  $r : ContractRule( holiday == false && dayOfWeek >= 1 && dayOfWeek <= 6
&& (hourOfDay >= 600 && hourOfDay < 1400 ||
  hourOfDay > 2000 && hourOfDay <= 2200) && hourType == "undefined")
then
  modify($r){
    setHourType("semiPeak")
  }
end

rule "Off peak hour"
when
  $r : ContractRule( (holiday == true ||  dayOfWeek == 7  || hourOfDay < 600
|| hourOfDay > 2200) && hourType == "undefined" )
then
  modify($r){
    setHourType("offPeak")
  }
end

template contract_rate
  rule "Summer on peak primary rate"
  when
    $r : ContractRule( season == "summer" && hourType == "onPeak" && type ==
"primary")
  then
    $r.setRate(@{summerOnPeakPrimaryRate});
  end
end template




2010/11/9 Wolfgang Laun <wolfgang.laun at gmail.com>

> Seeing the template .drl would help to resolve this. Are all @{parameter}s
> declared in the template header?
> -W
>
> 2010/11/9 Roger Smith <rogersmith1711 at gmail.com>
>
>>
>> All -
>>
>> I tried out Drools rule template with a with a proptotype app. Drools is
>> throwing NullPointerException as below. I would much appreciate if someone
>> on this list can help.
>>
>> java.lang.NullPointerException
>>     at
>> org.drools.template.parser.DefaultTemplateColumn.createCellCondition(DefaultTemplateColumn.java:68)
>>     at
>> org.drools.template.parser.DefaultTemplateColumn.addCondition(DefaultTemplateColumn.java:91)
>>     at
>> org.drools.template.parser.DefaultTemplateRuleBase.createColumnConditions(DefaultTemplateRuleBase.java:105)
>>     at
>> org.drools.template.parser.DefaultTemplateRuleBase.createTemplateRule(DefaultTemplateRuleBase.java:98)
>>     at
>> org.drools.template.parser.DefaultTemplateRuleBase.getDTRules(DefaultTemplateRuleBase.java:85)
>>     at
>> org.drools.template.parser.DefaultTemplateRuleBase.<init>(DefaultTemplateRuleBase.java:64)
>>     at
>> org.drools.template.parser.TemplateDataListener.<init>(TemplateDataListener.java:76)
>>     at
>> org.drools.template.parser.TemplateDataListener.<init>(TemplateDataListener.java:52)
>>     at
>> org.drools.template.ObjectDataCompiler.compile(ObjectDataCompiler.java:44)
>>
>>
>> Here is my code
>>
>>         KnowledgeBuilder kBuilder =
>> KnowledgeBuilderFactory.newKnowledgeBuilder();
>>         ObjectDataCompiler converter = new ObjectDataCompiler();
>>         InputStream dis = new FileInputStream( new File(
>> "/home/pranab/Projects/gridx/ct11_1.drl" ) );
>>         if (null == dis){
>>           System.out.println("null rule template stream");
>>           return;
>>         }
>>
>>         Collection<Map<String,Object>> paramMaps = new
>> ArrayList<Map<String,Object>>();
>>
>>         Map<String,Object> params = new HashMap<String,Object>();
>>
>>         params.put("summerOnPeakPrimaryRate", new Integer(299));
>>         params.put("summerOnPeakSecondaryRate", new Integer(524));
>>         params.put("summerSemiPeakPrimaryRate", new Integer(176));
>>         params.put("summerSemiPeakSecondaryRate", new Integer(305));
>>         params.put("summerOffPeakPrimaryRate", new Integer(139));
>>         params.put("summerOffPeakSecondaryRate", new Integer(243));
>>         params.put("winterOnPeakPrimaryRate", new Integer(249));
>>         params.put("winterOnPeakSecondaryRate", new Integer(438));
>>         params.put("winterSemiPeakPrimaryRate", new Integer(176));
>>         params.put("winterSemiPeakSecondaryRate", new Integer(305));
>>         params.put("winterOffPeakPrimaryRate", new Integer(139));
>>         params.put("winterOffPeakSecondaryRate", new Integer(243));
>>         paramMaps.add(params);
>>
>>         String drl = converter.compile(paramMaps, dis);
>>         Reader rdr = new StringReader( drl );
>>         kBuilder.add( ResourceFactory.newReaderResource(rdr),
>> ResourceType.DRL);
>>
>>
>> The line in blue is throwing the exception. This code is very similar to
>> the example code in Drools Expert guide.
>>
>> Best,
>>
>> Roger
>>
>>
>>
>> _______________________________________________
>> rules-users mailing list
>>
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
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