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@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@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

 

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