[rules-users] Declaration of Metadata tags for External Data Models in Guvnor.

[Meyer, David A]

I have a set of externally defined java beans that are utilized elsewhere in
the overarching application, and would like to declare these external
classes as events within drools. I am able declare these objects as events,
and compile a drools DRL file, and execute the rules.  When the same DRL is
imported into the Guvnor, the resulting package "PKG" issues an  "unable to
define Type Declaration class {object}" exception error.  Preliminary
investigation has turned up JIRA #'s GUVNOR-379
<https://jira.jboss.org/jira/browse/GUVNOR-379>, and BRMS-144
<https://jira.jboss.org/jira/browse/BRMS-144>, that indicate this behavior
has been identified, but no solution is presented.  The Drools documentation
for both the expert and fusion component functionality indicates that
metadata can be declared with or without actually declaring fields. This
capability is key to allowing the utilization of externally defined data
model objects within drools.

 

Example DRL declaration section that works as specified when the DRL file is
built into a knowledge base, but does not work when the Guvnor package is
built in to a knowledge base. I am currently utilizing Drools 5.0.1 in both
the IDE development environment as well as the Guvnor deployment
environment.

 

begin  data model fragment .

 

Import com.datamodel.MyEvent;

 

Declare MyEvent

   @role(event)

  @timestamp(eventDate)

end

 

. end data model fragment

 

Seems that the data model definition shown above should produce the same
results whether using the DRL resource type, or the PKG resource produced by
the Guvnor package builder.  Are these JIRA's closed in 5.1 or are they
still pending.  The system utilizing the Guvnor should allow deployment of
DRLs to the GUVNOR without change, this bug does not allow that. 

 

David A. Meyer 
System Engineer 
I&SS Mission Operations - Colorado 
Boeing Defense, Space & Security 
The Boeing Company 
Telephone 303-307-5836 

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