[rules-users] java.lang.NullPointerException atorg.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:54)

[Shiva Shankar Reddy Katula]

Hi All,

 

I am using Drools 4.0.3 

 

I have the following in drl file.

 

package com.framework.service.remote.rules; 

 

import com.framework.service.EssRuleConditionService; 

import com.framework.service.util.CurrentLeg; 

import java.util.ArrayList; 

import java.util.List; 

import java.lang.Boolean;  

 

function List depStationFun68307cu() { 

            EssRuleConditionService essRuleConditionService = new EssRuleConditionService();  

            essRuleConditionService.setDepStation("21618");  

            return essRuleConditionService.getDepStation(); 

}  

function List depStationFun68308cu() { 

            EssRuleConditionService essRuleConditionService = new EssRuleConditionService();  

            essRuleConditionService.setDepStation("20932");  

             return essRuleConditionService.getDepStation(); 

}  

function List depStationFun68309cu() { 

            EssRuleConditionService essRuleConditionService = new EssRuleConditionService(); 

            essRuleConditionService.setDepStation("21972");  

            return essRuleConditionService.getDepStation(); 

}  

 

rule "68307" 

            dialect "java" 

            when  

                        currentLeg : CurrentLeg()                    

                         eval(currentLeg.getORGSTN().size()!=0 && depStationFun68307cu().containsAll(currentLeg.getORGSTN()))  

            then   

                        currentLeg.setDataProcessedByDrool(new Boolean(true)); 

                        currentLeg.setRuleSetId("9003");

                        currentLeg.setFssBoardDailyLegId("");

            end 

rule "68308" 

            dialect "java" 

            when 

                        currentLeg : CurrentLeg()                                                        

                        eval(currentLeg.getORGSTN().size()!=0 && depStationFun68308cu().containsAll(currentLeg.getORGSTN()))  

            then   

                        currentLeg.setDataProcessedByDrool(new Boolean(true)); 

                        currentLeg.setRuleSetId("9003");

                        currentLeg.setRuleSetCategoryId("15722");

                        currentLeg.setFssBoardDailyLegId("");                        

            end 

rule "68309" 

            dialect "java" 

            when  

                        currentLeg : CurrentLeg()                    

                        eval(currentLeg.getORGSTN().size()!=0 && depStationFun68309cu().containsAll(currentLeg.getORGSTN()))  

            then   

                        currentLeg.setDataProcessedByDrool(new Boolean(true)); 

                        currentLeg.setRuleSetId("9003");

                        currentLeg.setRuleSetCategoryId("15722");

                        currentLeg.setFssBoardDailyLegId("");

            end 

 

            

            

I have the following code to access drl file :

 

// get the .drl constructed as inputstream

// droolsInputString is drl file read into String.

// I dont have any issue reading the file but i get the null pointer exception 

 

byte[] bytesOfDRL = droolsInputString.getBytes();

InputStream inputStream = new ByteArrayInputStream(bytesOfDRL);

Reader source = new InputStreamReader(inputStream);

 

PackageBuilderConfiguration conf = new PackageBuilderConfiguration();

 

PackageBuilder builder = new PackageBuilder(conf);

builder.addPackageFromDrl(source);

 

// when the last line is executed.  builder.addPackageFromDrl(source);

 

Here i get the following exception

 

17:57:50,776 ERROR [STDERR] java.lang.NullPointerException

17:57:50,776 ERROR [STDERR] at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:54)

17:57:50,776 ERROR [STDERR] at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:67)

17:57:50,776 ERROR [STDERR] at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446)

17:57:50,791 ERROR [STDERR] at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304)

17:57:50,791 ERROR [STDERR] at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167)

17:57:50,791 ERROR [STDERR] at com.egatematrix.ess.framework.service.remote.rules.RulesEngineInvoker.readRule(RulesEngineInvoker.java:108)

17:57:50,791 ERROR [STDERR] at com.egatematrix.ess.framework.service.RuleService.doProcess(RuleService.java:302)

17:57:50,791 ERROR [STDERR] at com.egatematrix.ess.framework.service.FetchFSSData.invokeRuleService(FetchFSSData.java:141)

17:57:50,791 ERROR [STDERR] at com.egatematrix.ess.framework.service.FetchFSSData.triggerData(FetchFSSData.java:69)

17:57:50,791 ERROR [STDERR] at com.egatematrix.ess.framework.service.FetchFSSData$1.run(FetchFSSData.java:85)

17:57:50,791 ERROR [STDERR] at java.util.TimerThread.mainLoop(Timer.java:512)

17:57:50,791 ERROR [STDERR] at java.util.TimerThread.run(Timer.java:462)

 

 

I have tried compiling the drl file in drl editor. There is no error in drl file.

Can any one help me resolving the issue?

 

Regards,

Shiva

Tel: +91-40-27782000 Ext: 4259

 

 

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