7:43 a.m.
Strange, I just tried your code and it does seem to print out the Hello
world statement when executing the rule. I attached the Eclipse project
that I created from this, could you try this? It might be valuable to
figure out the differences in the log files (I included mine in the zip
file as well).
I'm using the latest snapshots though, which can be downloaded here:
https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/t...
Kris
Quoting Todd Pagni <todd.pagni(a)datacert.com>:
For some reason I cannot get the most basic rule to fire from a
flow.
Not sure what is going on, but would appreciate some help. This is
in
Drools 5.1.0.M1.
I pretty much followed the example at
http://www.developer.com/java/ent/article.php/10933_3821101_4/Rev-Up-the
-Drools-5-Java-Rule-Engine.htm, but it did not work for me. I
don't
get an error message and I don't see the rule fire and print the
system.out.
.rf
<?xml version="1.0" encoding="UTF-8"?>
<process xmlns="http://drools.org/drools-5.0/process"
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:schemaLocation="http://drools.org/drools-5.0/process
drools-processes-5.0.xsd"
type="RuleFlow" name="flow"
id="com.sample.bpmn.hello"
package-name="com.sample">
<header>
</header>
<nodes>
<end id="4" name="End" x="561" y="140"
width="48" height="48" />
<start id="1" name="Start" x="66" y="88"
width="48" height="48"
/>
<ruleSet id="3" name="Rule" x="368"
y="159" width="80"
height="48"
ruleFlowGroup="helloGroup" />
</nodes>
<connections>
<connection from="3" to="4" />
<connection from="1" to="3" />
</connections>
</process>
.dlr
package com.sample
import com.sample.DroolsTest.Message;
rule "Hello World Message"
ruleflow-group "helloGroup"
when
m : Message( status == Message.HELLO, myMessage : message
)
then
System.out.println( myMessage + "***" );
m.setMessage( "Goodbye cruel world Message" );
m.setStatus( Message.GOODBYE );
update( m );
end
Java
package com.sample;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.bpmn2.xml.BPMNSemanticModule;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderConfiguration;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.compiler.PackageBuilderConfiguration;
import org.drools.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;
/**
* This is a sample class to launch a rule.
*/
public class DroolsTestFlowAndRule {
public static final void main(String[] args) {
try {
// load up the
knowledge
base
KnowledgeBase kbase
=
readKnowledgeBase();
StatefulKnowledgeSession
ksession = kbase.newStatefulKnowledgeSession();
KnowledgeRuntimeLogger
logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession,
"test");
// start a new
process
instance'
Message message =
new
Message();
message.setMessage("Hello World Message");
message.setStatus(Message.HELLO);
ksession.insert(message);
ksession.startProcess("com.sample.bpmn.hello");
ksession.fireAllRules();
logger.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
private static KnowledgeBase readKnowledgeBase()
throws
Exception {
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("hello.rf"),
ResourceType.DRF);
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
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());
return kbase;
}
public static class Message {
public static final int HELLO = 0;
public static final int GOODBYE = 1;
private String message;
private int status;
public String getMessage() {
return this.message;
}
public void setMessage(String
message) {
this.message =
message;
}
public int getStatus() {
return this.status;
}
public void setStatus(int status) {
this.status =
status;
}
}
}
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