Calling POJO class get Method in BRL
by srinivasasanda
Hi,
I've a BRL with Person as a fact containing field name age(in sample
package).
Now,I've a POJO class named PersonDetails with fields age,name with its
getters,setters methods.Now I uploaded that POJO model in that sample
package.
Now,I need to check in When condition of brl whether age in Person fact is
equal to the value obtained from getAge() method of PersonDetails POJO
class.
When I used guided editor it is giving as age is equal to 1.Literal
Value,2.Expression editor,3.Formulae.
How can i achieve that ??I should create new instance of PersonDetails p in
When condition and i should call p.getAge() and that value must be compared
to age in Person Fact.
Can you please suggest me how to achieve this..
Thanks
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13 years, 12 months
Drools Java/EJB Deployment
by swaroop
Hi,
I want to deploy the .DRL,.DRT and Decision tables on to some app
server(Tomcat/JBoss) and access the decision entities using an exposed
business method. Please suggest some approaches and samples. I am using
change-set for loading rules, decisiontables, ruleflows .I Have my object
model converted to a jar. Iam using stateful session.
Thanks
Swaroop
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13 years, 12 months
using CE accumulate
by bobbi_80
Hi,
I have the following bean and trying to run "accumulate" to get the average
of CPU usage from a cluster.
public static class cpuTracker{
private String machinename;
private String averageCPU;
}
My rule is as follows.
rule check
when
$aggr : Number() from accumulate(cpuTracker($avg :
Integer.parseInt(averageCPU.split("\\.")[0])), average($avg))
then
System.out.println(" Average value : " + $aggr);
end
If the averageCPU is an integer type then accumulate works fine but my
problem is that it is string type and I am trying to convert it to integer
from a rule file and it throws a bunch of compile time errors.
any help in resolving it or some workaround is highly appreciated.
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13 years, 12 months
ProcessEventListener event order
by Carlos Villegas
Hi,
I'm testing the ProcessEventListener on a simple process and I get the
"after" events in reverse order.
For example,
Process completed : 1283915643204
Node left: 5: 1283915643268
Node triggered: 5: 1283915643268
Node left: 4: 1283915643268
Node triggered: 4: 1283915643269
Node left: 3: 1283915643269
Node triggered: 3: 1283915643270
Node left: 2: 1283915643270
Node triggered: 2: 1283915643270
Node left: 1: 1283915643270
Node triggered: 1: 1283915643271
Node left: 0: 1283915643271
Node triggered: 0: 1283915643271
Process started : 1283915643271
I'm just printing the node id and the time in milliseconds.
Is this the way is supposed to be?
I guess technically "after" could be anytime after, but if I use the
afterProcessStarted event, I get it after the whole process has
completed!, which it's not useful at all.
The "before" events work as expected I think.
I'm using Drools Flow 5.1.0.
Thanks,
Carlos
13 years, 12 months
Null pointer exception after adding When condtion in Guvunor
by JimK
Using the latest JBPM installer demo setup, I have a simple program. It has
an object called person with a name and a salary. In guvonor there is a
simple rule that I scaled back from the original to try to see what is
happening. If I have a condition (salary >= 5000) it gives a null
exception, if I remove the condition it works fine. The new fact is inserted
and I can see it from my program. Just starting experimenting with guvonor
and have been following the threads on changeset but don't have a complete
grasp on it yet.
Thanks in advance,
Jim K.
rule "PersonWIthHighIncome"
no-loop true
dialect "mvel"
when
Person( salary >= 5000 )
then
Person fact0 = new Person();
fact0.setName( "Joe" );
fact0.setSalary( 34465 );
insert(fact0 );
end
This results in the following exception:
java.lang.NullPointerException
at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:148)
at
org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1016)
at
org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:785)
at
org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:657)
at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190)
at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:169)
at simpleBank.SimpleBank.createKnowledgeBase(SimpleBank.java:64)
at simpleBank.SimpleBank.main(SimpleBank.java:27)
Code calling the package
package simpleBank;
import java.util.ArrayList;
import java.util.Iterator;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.agent.KnowledgeAgent;
import org.drools.agent.KnowledgeAgentConfiguration;
import org.drools.agent.KnowledgeAgentFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;
public class SimpleBank {
public static void main(String[] args) {
try {
// load up the knowledge base
//KnowledgeBase kbase = readKnowledgeBase();
KnowledgeBase kbase = createKnowledgeBase();
StatefulKnowledgeSession ksession =
kbase.newStatefulKnowledgeSession();
//KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test");
KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newThreadedFileLogger(ksession, "Test2", 1);
// go ! insert one person
Person person = new Person();
person.setSalary((long) 6000);
person.setName("Jim");
System.out.println(person.getName());
ksession.insert(person);
assertTrue(ksession.getFactCount() == 1);
ksession.fireAllRules();
// rules should have added another fact
assertTrue(ksession.getFactCount() != 1);
ArrayList<Person> listoffacts = new ArrayList(ksession.getObjects());
System.out.println(listoffacts.size());
Iterator<Person> itr = listoffacts.iterator();
while (itr.hasNext()){
Person element = itr.next();
System.out.println(element.getName() + ":" +
element.getSalary().toString());
}
logger.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
private static KnowledgeBase createKnowledgeBase() throws Exception{
KnowledgeAgentConfiguration kaconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
kaconf.setProperty( "drools.agent.scanDirectories", "false" );
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent( "test
agent", kaconf );
kagent.applyChangeSet(ResourceFactory.newUrlResource(
"http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/Sale..."
));
// kagent.applyChangeSet(
ResourceFactory.newClassPathResource("ChangeSet.xml"));
return kagent.getKnowledgeBase();
}
private static void assertTrue(boolean b) {
if (b)
{
System.out.println("Good number of facts");
}
else
{
System.out.println("Bad number of facts");
}
}
}
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13 years, 12 months
Drools 5.3 on Glassfish
by Chris Selwyn
I have just started looking at Drools 5.3 with a view to running the
Guvnor on Glassfish.
I have been using Drools 5.1 Guvnor on Glassfish 2.1 very happily for
some time but I thought that I should look at upgrading.
In fact, some time ago, I posted instructions here on how to setup
authentication for Guvnor against a Glassfish realm.
However, I notice that there are now different Guvnor binaries for
several different ASs but that list does not include Glassfish.
Since Glassfish 2.1 includes Tomcat as its JSP/Servlet container I have
used the Tomcat version and on first inspection it appears to work.
Have other users tried this combination? Did it work/not work for you?
Chris
13 years, 12 months
