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

If you move the template contract_rate up in front of the first rule "holiday july 4th" the NPE is gone. I haven't been able to validate the (presumably) generated rule set, but you should be able to do that now. Nevertheless, this warrants a JIRA, which I'll create forthwith. Also, the docs should indicate what is permitted up front, preceding the "template" statement. -W 2010/11/10 Roger Smith <rogersmith1711(a)gmail.com&gt;: > 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 > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users