[rules-users] Drools Guvnor: java.lang.ClassCastException: [Lorg.drools.rule.Package; cannot be cast to org.drools.rule.Package

[Hushen Savani]

Hi Team, 

 

            I'm a newbie to Drools. Please help me here. 

 

1. I have created a Package named "org.sample". 

 

2. I have created a Model named "TestModel" in the same package. 

 

3. I have created a Fact named "Number" in the same Model. 

 

4. "Number" fact is as following: 

 

 Fact <http://drools.46999.n3.nabble.com/file/n4021008/01_Fact.bmp> 

 

5. Then I have created a category named "TestCategory". 

 

6. Then created a sample Rule named "ruletest" in that category. 

 

7. Rule is created as following:

 

rule "numberone is equal to numbertwo"

            when

                        n : Number(numberone == numbertwo);

            then

                        n.setMessage("numberone is equal to numbertwo");

end      

 

rule "numberone is greater than numbertwo"

            when

                        n : Number(numberone > numbertwo);

            then

                        n.setMessage("numberone is greater than numbertwo");

end

 

rule "numberone is less than numbertwo"

            when

                        n : Number(numberone < numbertwo);

            then

                        n.setMessage("numberone is less than numbertwo");

end

 

 8. Built the package and created the snapshot. 

 

9. Wrote a JAVA POJO client as following: 

 

package org.sample;

 

import org.drools.RuleBase;

import org.drools.WorkingMemory;

import org.drools.agent.RuleAgent;

import org.drools.definition.type.FactType;

 

public class DroolGuvnor {

      public static void main(String[] args) throws InstantiationException,
IllegalAccessException {

            RuleAgent ruleAgent =
RuleAgent.newRuleAgent("/Guvnor.properties");

            RuleBase ruleBase = ruleAgent.getRuleBase();

            

            FactType factType = ruleBase.getFactType("org.sample.Number");

            Object obj = factType.newInstance();

            

            factType.set(obj, "numberone", 2);

            factType.set(obj, "numbertwo", 1);

            

            WorkingMemory workingMemory = ruleBase.newStatefulSession();

            workingMemory.insert(obj);

            workingMemory.fireAllRules();

            

            System.out.println(factType.get(obj, "message"));

      }

}

 

 

 10. The "guvnor.properties" file is as following: 

 

url=http://localhost:10080/guvnor-5.5.0.Final-tomcat-6.0/org.drools.guvnor.G
uvnor/package/org.sample/TestSnapshot

enableBasicAuthentication=true

username=admin

password=admin

name=drooltest

 

 11. But, when I run the client, I get following exception: 

 

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

SLF4J: Defaulting to no-operation (NOP) logger implementation

SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further
details.

Exception in thread "main" java.lang.ClassCastException:
[Lorg.drools.rule.Package; cannot be cast to org.drools.rule.Package

      at
org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:86)

      at org.drools.agent.URLScanner.readPackage(URLScanner.java:171)

      at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:143)

      at org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:119)

      at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:431)

      at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:383)

      at org.drools.agent.RuleAgent.configure(RuleAgent.java:368)

      at org.drools.agent.RuleAgent.init(RuleAgent.java:268)

      at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:208)

      at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:168)

      at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:277)

      at org.sample.DroolGuvnor.main(DroolGuvnor.java:10)

 

Please help on this. Thanks. 

 

 

Best Regards, 

Hushen Savani

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