Drools eclipse plugin and J2ee project problem
by Sahid Khan (সাহিদ)
Hello,
I am using eclipse 3.4 on a linux machine. I mostly work in Java EE
perspective. It was working fine till now. But after I installed
Drools plugin [1], trying to open a Java EE project from Java EE
perspective is making eclipse stuck. I can not even close eclipse once
I click on "Open Project". The progress bar says it is opening the
project. But it is taking eternal. Any possible reason why this can
happen?
Thanks in Advance,
--
S.
Argue with idiots, and you become an idiot. - PG
16 years, 7 months
why loop fire with no-loop is true?
by Sinboy Zhang
*i expect the result is 530,and define the "no-loop=true" in the rules ,but
result is 460,why?*
*
--------------------------------------------------------------------------------------------------------------------------------------------------
*
my java test code:
package org.sample;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
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 SalesTest {
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");
// go !
Sales message = new Sales();
message.setName("sinboy");
message.setSales(600);
ksession.insert(message);
ksession.fireAllRules();
//ksession.dispose();
System.out.println("updated:"+message.getName()+","+message.getSales());
logger.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
//kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
kbuilder.add(ResourceFactory.newUrlResource("
http://127.0.0.1:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/org...."),
ResourceType.PKG);
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;
}
}
*the print info is:*
fired1:discount,550
fired0:discount,530
fired1:discount,480
fired0:discount,460
updated:discount,460
---------------------------------------------------------------------
my java model is :
package org.sample;
import java.util.Date;
public class Sales {
private String name;
private long sales;
private Date dateOfSale;
private boolean chocolateOnlyCustomer;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getSales() {
return sales;
}
public void setSales(long sales) {
this.sales = sales;
}
public Date getDateOfSale() {
return dateOfSale;
}
public void setDateOfSale(Date dateOfSale) {
this.dateOfSale = dateOfSale;
}
public boolean isChocolateOnlyCustomer() {
return chocolateOnlyCustomer;
}
public void setChocolateOnlyCustomer(boolean choclateOnlyCustomer) {
this.chocolateOnlyCustomer = chocolateOnlyCustomer;
}
}
rules:
dialect "mvel"
*no-loop true*
rule "DiscountRule"
salience 9
when
$fact0:Sales(s:sales>100)
then
#Sales fact0=new Sales();
#fact0.setSales(s.getSales()-10);
#fact0.setName("discount");
#insert(fact0);
modify($fact0){setName("discount")}
modify($fact0){setSales(s-20)}
System.out.println("fired0:"+$fact0.getName()+
","+$fact0.getSales());
end
rule "DiscountRule2"
salience 18
when
$fact1:Sales(s1:sales>500)
then
modify($fact1){setName("discount")}
modify($fact1){setSales(s1-50)}
System.out.println("fired1:"+$fact1.getName()+
","+$fact1.getSales());
end
**
16 years, 7 months
Message could not be delivered
by The Post Office
The original message was received at Sat, 28 Nov 2009 14:34:00 +0530 from [141.36.158.144]
----- The following addresses had permanent fatal errors -----
rules-users(a)lists.jboss.org
----- Transcript of the session follows -----
... while talking to host lists.jboss.org.:
>>> RCPT To:<rules-users(a)lists.jboss.org>
<<< 550 5.1.1 <rules-users(a)lists.jboss.org>... Not known here
16 years, 7 months
tutorial movies
by zubin
Hello, the tutorial movies available at the following link are not
working, only the Drools Expert Intro is valid. The other movies are
invalid and not working, can these be reinstated?
http://www.jboss.org/drools/videos/index.html
Expert is working .mov file is fine.
Guvnor, Fusion, and Flow not available / .mov corrupt.
16 years, 7 months
Knowledge Agent resource auto loading (.drl/java obj)
by nadeem mehmood
hi friends,
I am working with Knowledge Agent to automatic loading of resources (.drl, .java objects) into the statefullKnowledgeSession KB, and then firing them automatically. The problem is although I have set true the scanDirectories and scanResources configurations of the knowledge agent, but it does't loads the files from the subdirectories.
suppose, if I set in my changeSet.xml as:<add> <resource source='file:src/main/rules/rulerep/' type='DRL' /> </add>
and then put my rules package(including .drl/java objects) it does't loads that.
However if I put the simple drl file with a simple rule like, it loads it and fires also, successfully.rule "Rule 01" when eval (1==1) then System.out.println("Rule 01 Works");end
As we know that we can only reference java objects using packages in rule files. So I want to put a package carrying rules and referenced objects in the focused directory, into which the Knowledge agent is looking for the new resources. in my case it is rulerep.Am new to drools, any suggestions plz.
bst regards,nadeem
16 years, 7 months
drools-solver NPE in DefaultSimpleScore
by Andrew Waterman
Hi,
I migrated some solver code that I had working on 5.0M4 to the 5.1.0
implementation. I'm now seeing the following while running the solver:
java.lang.NullPointerException
at org.drools.solver.core.score.DefaultSimpleScore.compareTo
(DefaultSimpleScore.java:73)
at org.drools.solver.core.score.DefaultSimpleScore.compareTo
(DefaultSimpleScore.java:13)
at
org.drools.solver.core.localsearch.bestsolution.BestSolutionRecaller.stepTaken
(BestSolutionRecaller.java:56)
at
org.drools.solver.core.localsearch.DefaultLocalSearchSolver.stepTaken
(DefaultLocalSearchSolver.java:171)
at
org.drools.solver.core.localsearch.DefaultLocalSearchSolver.solveImplementation
(DefaultLocalSearchSolver.java:121)
at org.drools.solver.core.AbstractSolver.solve(AbstractSolver.java:41)
I ran my test with a debugger attached, and this call is returning a
Null:
Score bestScore = localSearchSolverScope.getBestScore();
<org.drools.solver.core.localsearch.bestsolution.BestSolutionRecaller:
55>
The BestSolution is not null although the best score is.
Should I file an issue on this in JIRA? Or perhaps this reflects some
change to the old code that I didn't migrate properly?
best wishes,
Andrew
16 years, 7 months
Mail System Error - Returned Mail
by Returned mail
The original message was received at Fri, 27 Nov 2009 19:03:15 +0100
from lists.jboss.org [15.79.180.224]
----- The following addresses had permanent fatal errors -----
rules-users(a)lists.jboss.org
----- Transcript of the session follows -----
... while talking to 36.211.230.11:
550 5.1.2 <rules-users(a)lists.jboss.org>... Host unknown (Name server: host not found)
16 years, 7 months
Updates with property change on facts. How???
by Jason Smith
I implemented the following listener for my bean and I am calling .update() directly on the StatefulKnowledgeSession.
QUESTION 1: Is there a better way? The old API supported .insert(fact,boolean). The new one does not. I am not finding any documentation that explains the new API (version 5.0.1).
QUESTION 2: Why is this calling my rule twice? The rule is getting called twice, and the second time it's called, the entry conditions are invalid! That is, I changed the bean in a way that invalidates the WHEN condition. The rule still gets called twice.
How do I even begin to go about troubleshooting this? This same behavior was happening with Drools 4 and the old API as well.
private class InnerPropertyChangeListener implements PropertyChangeListener
{
private final InternalFactHandle factHandle;
private final Object fact;
private final StatefulKnowledgeSession session;
public InnerPropertyChangeListener(InternalFactHandle factHandle, Object fact, StatefulKnowledgeSession session)
{
this.factHandle = factHandle;
this.fact = fact;
this.session = session;
}
@Override
public void propertyChange(PropertyChangeEvent evt)
{
System.out.println("****** UPDATING " + evt.getPropertyName() + ": " +
"\n NEW: " + StringUtil.indent(BeanUtil.printObject(evt.getNewValue()),16) +
"\n OLD: " + StringUtil.indent(BeanUtil.printObject(evt.getOldValue()),16));
if((evt.getNewValue() == null && evt.getOldValue() != null) || !evt.getNewValue().equals(evt.getOldValue()))
{
session.update(factHandle, fact);
}
}
}
Jason Smith
16 years, 7 months
Timer Node Period not firing repeatedly (running in active mode using fireUntilhalt())
by Boardman, Paul
I 'm using Drools flow 5.1m1 and have created a simple Timer test flow.
It has a simple Action node after the timer that Prints out "Hello".
I have set the timer delay to 5000 and the Timer Period to 2000. What I
expect to happen is I get Hello printed after 5 seconds, then followed
by Hello every 2 seconds until I call halt on the session. However I
just get the first Hello after 5 seconds and that's it.
I am calling session.fireUntilHalt() in a separate thread and then
starting my process just after this thread has started. (basically
copying the code in section 3.9 Timers from the docs)
Thanks
Paul
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16 years, 7 months
How to enforce dependecy rules
by pdario
Hello,
I need some help to understand how to enforce dependency rules with Drools.
Suppose you have two objects - A and B - and two business rules that say:
"if A is selected, unselect B" and "if B is selected, unselect A".
How can I be sure that Drools unselects B when user selects A and viceversa?
How can avoid a loop or Drools resolving dependency unselecting what the
user just selected?
Should I use Solver or Fusion?
Or... Is Drools the wrong tool?
Thanks a lot!
Dario
--
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16 years, 7 months
