[rules-users] Could not execute Rules getting NPE

[Michael Anstis]

Without line numbers we can but guess.

I'd gamble that the NPE relates to not being able to find
/Guvnor.properties on your class path.


On 30 August 2013 14:05, Smurfs <smurfs.doll at gmail.com> wrote:

> Hi
>
> I am new to Drools. I am using a maven project to connect to guvnor and
> execute the rules.
>
>
> pom.xml
> -----------
>  <dependency>
>       <groupId>org.drools</groupId>
>       <artifactId>drools-compiler</artifactId>
>       <version>5.5.0.Final</version>
>     </dependency>
>
> Code
> -----
>  public static void main(String[] args) throws InstantiationException,
>                         IllegalAccessException {
>
>        KnowledgeAgent ruleAgent =
> KnowledgeAgentFactory.newKnowledgeAgent("/Guvnor.properties");
>
>
>
> System.out.println(ruleAgent.getKnowledgeBase().getFactType("org.sample","NumberTest"));
>
>                 KnowledgeBase ruleBase = ruleAgent.getKnowledgeBase();
>
>
> System.out.println(ruleBase.getFactType("org.sample","NumberTest"));
>
>                 FactType factType = ruleBase.getFactType("org.sample",
> "NumberTest");
>
>                 Object obj = factType.newInstance();
>
>                 factType.set(obj, "numberone", 2);
>
>                 factType.set(obj, "numbertwo", 1);
>
>                 StatefulKnowledgeSession workingMemory =
> ruleBase.newStatefulKnowledgeSession();
>
>                 workingMemory.insert(obj);
>
>                 workingMemory.fireAllRules();
>
>                 System.out.println(factType.get(obj, "message"));
>
>         }
>
> I am getting the null pointer exception as below:
> null
> Exception in thread "main" java.lang.NullPointerException
>         at com.test.drools.guvnor.App.main(App.java:44)
>
>
> I know, that many people has raised this issue, can anyone know why it is
> causing the issue?
> Thanks
> Smurfs
>
>
>
> --
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