I’m working with Drools 5.

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mauricio Salatino
Sent: Monday, November 02, 2009 1:45 PM
To: Rules Users List
Subject: Re: [rules-users] How to execute a Process API result?

Are you working just with the Drools 4 version?
Or you can jump to the Drools 5 version?

On Mon, Nov 2, 2009 at 5:41 PM, Scott Stevenson <scott.stevenson@datacert.com> wrote:

I'm trying to execute the result of the Process API and running into
problems most likely stemming from my ignorance. I'm creating a new
process following the sample code from section 3.1.3.2 of the User
Guide. My sample process consists of:
1. StartNode
2. ActionNode that prints Hello World
3. EndNode

What I don't understand is how to get my new process into a
KnowledgeBase and KnowledgeSession for execution. I've tried the
following (Drools 4 method, I believe) as well:

       AbstractRuleBase ruleBase = (AbstractRuleBase)
RuleBaseFactory.newRuleBase();
       ruleBase.addProcess(createProcess());
       InternalWorkingMemory workingMemory = new ReteooWorkingMemory(1,
ruleBase);

workingMemory.startProcess("org.drools.sample.workflow.dynamic");

The result of the previous code is a RuntimeException (unable to execute
Action). Inner exception is null pointer from inside the
ActionNodeInstance class. Where am going wrong in implementing the
Process API?

Thank you,
Scott Stevenson

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