Here is my attempt at using the Drools 5 API to execute my dynamically created Process:

KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();

org.drools.rule.Package p = new org.drools.rule.Package("sample");

p.addProcess(createProcess());

KnowledgePackageImp kpi = new KnowledgePackageImp();

kpi.pkg = p;

List<KnowledgePackage> list = new ArrayList<KnowledgePackage>();

list.add(kpi);

kbase.addKnowledgePackages(list);

StatefulKnowledgeSession ksess = kbase.newStatefulKnowledgeSession();

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

I still get the same null pointer error. Perhaps the problem is in my implementation of the Process API? The code under createProcess is this:

RuleFlowProcessFactory factory = RuleFlowProcessFactory.createProcess("com.datacert.workflow.dynamic");

factory

.name("HelloWorldRuleSet")

.version("1.0")

.packageName("org.drools")

.startNode(1).name("Start").done()

.actionNode(2)

.name("Action")

.action("java", "System.out.println(\"Inside Action 1\");").done()

.endNode(3).name("End").done()

.connection(1, 2)

.connection(2, 3);

return factory.validate().getProcess();

Thanks,

Scott

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mauricio Salatino
Sent: Monday, November 02, 2009 2:14 PM
To: Rules Users List
Subject: Re: [rules-users] How to execute a Process API result?

That are only the fluent api to create processes. I recommend you the other approach:

KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

kbuilder.add( ResourceFactory.newClassPathResource("MyProcess.rf"),

              ResourceType.DRF );

KnowledgeBuilderErrors errors = kbuilder.getErrors();

if (errors.size() > 0) {

    for (KnowledgeBuilderError error: errors) {

        System.err.println(error);

    }

    throw new IllegalArgumentException("Could not parse knowledge.");

}

KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();



kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());



StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();





ksession.startProcess("com.sample.MyProcess");

If you need the reference to the process instance you can do:
WorkFlowProcessInstance processInstance = ksession.startProcess(...);

Work

2009/11/2 Scott Stevenson <scott.stevenson@datacert.com>

I read that section but I’m still not clear how to add my process (created like the section just before) to the KnowledgeBase. Section 3.2 shows adding an existing .rf file. I have this code:

RuleFlowProcessFactory factory = RuleFlowProcessFactory.createProcess("org.drools.sample.workflow.dynamic");

factory

.name("HelloWorldRuleSet")

.version("1.0")

.packageName("org.drools")

.startNode(1).name("Start").done()

.actionNode(2)

.name("Action")

.action("java", "System.out.println(\"Inside Action 1\");").done()

.endNode(3).name("End").done()

.connection(1, 2)

.connection(2, 3);

factory.validate().getProcess();

How does the getProcess() result get added to a KnowledgeBase?

Thanks,

Scott

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mauricio Salatino
Sent: Monday, November 02, 2009 1:57 PM

To: Rules Users List
Subject: Re: [rules-users] How to execute a Process API result?

Ok, so you need to start using the Drools 5 APIs.
Please take a look at the Drools 5 documentation:
http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-flow/html_single/index.html#d0e1375

In the section 3.2

Using a Process in Your Application

you will find the correct api's.
Greetings.

2009/11/2 Scott Stevenson <scott.stevenson@datacert.com>

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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