Fabian Weisensee wrote:
Yes, thanks for your help. I'll try your suggestion for #2.
I resolved the deployment problem by myself. It was just a mistake
with the JBoss ESB deploying...
But now I have another problem. The rule file is found, but there seem
to be some problems with the parser.
The FireRulesActionHandler class from the jbpm wiki uses the following
code:
RuleBaseImpl ruleBase = new RuleBaseImpl();
ruleBase.addPackage(pkg);
You should read the Drools docuemtation, heck every example we have
shows how to do this, and every example will show
RuleBase ruleBase = RuleBaseFactory.newRuleBase()
ruleBase.addPackage( pkg )
Where the pkg is created from the PackageBuilder class, again this is
all documented with full examples. What you are using, and someone
wrongly documented, was an internal implementation class, you should be
using the interface.
But the RuleBaseImpl class doesn't seem to be part of drools anymore.
I looked at the javadocs to find a replacement. I've found the
RuleBaseLoader class which looked like what I needed. I replaced the
two lines with this:
RuleBaseLoader rbl = RuleBaseLoader.getInstance();
RuleBase ruleBase = rbl.loadFromReader(reader);
ruleBase.addPackage(pkg);
but when I run this I get the following error:
ERROR [GraphElement] action threw exception: Unable to parser Reader
java.lang.RuntimeException: Unable to parser Reader
at org.drools.compiler.DrlParser.getParser(DrlParser.java:209)
at org.drools.compiler.DrlParser.parse(DrlParser.java:60)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:165)
at
org.drools.compiler.RuleBaseLoader.loadFromReader(RuleBaseLoader.java:38)
at
rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:92)
at
rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:49)
Of course I thought my rule file would be syntacticaly incorrect, but
even this rule file didn't work:
package rechnung.kontrolle
rule "test rule 1"
when
then
System.out.println("rule fired!");
end
What am I doing wrong? Is RulesBaseLoader the right class?
Are there any other Informations about integrating jBPM and Drools?
--Fabian
Aziz Boxwala schrieb:
Fabian,
Response to #1: I believe the rule file needs to reside in the root
directory of the archive/directory of the example application. I have
not tried that out so not sure.
With Drools 4.0.x, you have the option of having your rules be
located in the BRMS.
Response to #2: You should be able to do so using one decision-node.
Associate the rule action handler with either the Before Signal or
Node Enter event and specify your decision conditions on the
transitions out of that node..
--Aziz
----- Original Message ----
From: Fabian Weisensee <[EMAIL PROTECTED]>
To: [email protected]
Sent: Monday, November 12, 2007 7:35:02 AM
Subject: [rules-users] Drools and jBPM integration
Hi there
I have some questions concerning Drools and jBPM integration.
I know there is this wiki page:
http://wiki.jboss.org/wiki/Wiki.jsp?page=JbpmAndDrools
but first it's not really detailed and second does it seem to be
outdated.
1) I changed the FireRulesActionHandler from the wiki to reflect the
API-changes, that at least it's compileable. In the jBPM process
definition the rule file is simply passed as parameter like this:
"/Shipper.drl". To which directory does this relative path apply? So
where do I have to deploy this rule file? I tried several locations in
the application server, but even with an absolute path every time
FireRulesActionHandler tries to read the rule it crashes:
ERROR [GraphElement] action threw exception: null
java.lang.NullPointerException
at java.io <http://java.io.Re>.Reader.<init>(Unknown Source)
at java.io <http://java.io.In>.InputStreamReader.<init>(Unknown
Source)
at
rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:83)
at
rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:50)
2) As I understood the example in the wiki you have to create a node
which executes the rule and then a decision-node which routes the
process flow according to the rule results.
Is it possible to do this with just one node?
But perhaps I should ask this at the jBPM forums.
Every help would be appreciated. Thanks in advance.
Fabian Weisensee
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