[rules-users] Rule Validation/Package Build Error in Guvnor: ClassNot Found

[Jeffrey Schneller]

Your jar files [the models] need to be in the same drools package as
your DRL file.

 

So if in the Guvnor you have:

 

com.domain.project.rules

                Business Rules

                                Your DRL file

 

Then you need to have the model in the same package.

 

com.domain.project.rules

                Business Rules

                                Your DRL file

                Models

                                Jar 1

                                Jar 2

                                Jar 3

 

The objects in each jar don't have to be in the com.domain.project.rules
package.  They can be in any package.  You do need to import the correct
objects in your DRL however.  The package you specify in the Guvnor is
the package that the individual rules get compiled into.

 

 

 

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Ike Okafo
Sent: Monday, June 28, 2010 4:32 PM
To: rules-users at lists.jboss.org
Subject: [rules-users] Rule Validation/Package Build Error in Guvnor:
ClassNot Found

 

Hello,

I am new to Drools and have written a rule .DRL file which contains some

helper function imports from other packages, fact objects imports from 
other packages and the rules that act on these facts. The file works
well 
when I call it from my javacode using the rulebase or knowledgebase
approach. 

The drl file itself is in its own package.

I now have a requirement to call the same rules from within Guvnor.
The goal is to enable business users modify these rules through the 
Guvnor UI and also take advantage of the disable individual rules 
feature within guvnor.

My current difficulty is importing and validating the rules in guvnor, 
along with the associated fact jar files and finally interfacing 

with guvnor from my code. Any help would be appreciated .

The main error happens when I try to build a binary package and create
a snapshot of the working rule file I imported for deployment.
When I hit the save and validate configuration button, I get
"class not found" validation errors for all the classes imported at 
the top of the rule file - includingng the helper import functions
and facts used in the rules. Same thing happens when I try to 

build the package I get the following errors 

"Error importing: <list of all classes in import statement in rule
file>"

Here are the steps I followed in importing the rule file and Jar file
containing the classes
into Guvnor

(1) First within Guvnor I created a package corresponding to the package
path

for for each of the jar files whose classes are referenced/imported in
the rule .DRL file

(2) I created the jar files for each of these packages in eclipse

(3) Imported those jars individually into each of the packages created
in guvnor 
    using upload model jar function and selecting the appropriate path
as
    created in step 1 2 above

(4) Imported the rule file which is in its own package - using the
create package (upload method)

(5) I then try to save and validate the imported rule file in step 5
(this is where the error occurs)


I have already setup my code to call guvnor as follows

RuleAgent agent = RuleAgent.newRuleAgent("guvnor.properties");
RuleBase masterRuleBase = agent.getRuleBase();

guvnor.properties contains only one entry
url =
http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/Som
ePackage.drools/LATEST

It is my understanding that after I import the rule file
I need to save and validate and build the package
in order to  point the url to the path above. If I point the url to just
the drl file itself will it work?
i.e
url=http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package
/SomePackage.drools/LATEST.drl 
 

Any help to resolve the class not found error will 
be much appreciated

Thanks

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