Re: [rules-users] NullPointerException when using Drools rule template

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(a)gmail.com&gt; > > 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(a)gmail.com&gt; >> >> >> 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(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 > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users