Drools & jBPM Workshops (May 2011) - New York and Washington DC
by Mark Proctor
http://blog.athico.com/2011/04/drools-jbpm-workshops-may-new-york-and.html
After JBoss World we have two Drools and jBPM5 workshops in May for New
York and Washington. These are free events open to all in the public:
The events will be a mixture of talks with lots of time for questions
and discussions.
Speakers:
Mark Proctor - Drools co-creator and Project Lead
Kris Verlaenen - jBPM Project Lead
Edson Terelli - Drools technical lead.
Event: New York- Registration page and agenda
<http://www.jboss.org/events/workshops/drools.html>*
Date: *Tuesday, May 10, 2011
*Time*: 8:30am -- 5:30pm (breakfast, lunch, afternoon snack provided)
*Cost*: Free but register as seats are very limited.
*Location*: Affinia Manhattan Hotel
371 Seventh Avenue,
New York, NY 10001
Event: Washington -Registration page and agenda
<http://www.carahsoft.com/event-detail/846/redhat/>*
Date: *Thursday, May 12, 2011
*Time*: 8:30am -- 4:00pm
*Cost*: Free but register as seats are very limited.
*Location*: Renaissance Washington
999 Ninth Street, NW
Washington, DC 2000
14 years, 9 months
Rules with C++
by Sumeet Karawal
Hi All,
I have my application written in C++. How can I use Drools to make rules
that work on C++ facts. Also How to use BRMS in this case?
It would be very helpful if somebody could guide me on this.
Thanks and Regards,
Sumeet Karawal
Mailto: sumeet.karawal(a)tcs.com
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14 years, 9 months
help! rule"rule_key" failed to predicate
by 赵慧
hi,thank you very much for helping me with the problem.nevertheless,I have got another error. I compile the program and get the errors as follows:
[4,0]: [ERR 103] Line 4:0 rule 'rule_key' failed predicate: {(validateIdentifierKey(DroolsSoftKeywords.RULE))}? in rule
[4,9]: [ERR 101] Line 4:9 no viable alternative at input 'com' in rule package
I don't know how it happened, looking forward to your reply! thank you !!!
> Try adding 'dialect "mvel"' (no single quotes) after the rule name to the top of each of the rules. I have seen this error before and doing this resolved the issue.
>
> >hello,everyone!I wrote a rule with Drools,but the error told me that the field Server.Message is not visible, I can't find how it happens. Please
> >help me, I am almost exhausted with it. thank you.
> >the rules are as follows:
> >
> >package com.sample
> >import com.sample.Server;
> >
> >rule "system will execute 'tc' command"
> > when
> > eval(Server.Message>8388608)
> > then
> > System.out.println("The network is so crowd that it needs repairing.");
> > Runtime.getRuntime().exec("tc");#execute the "tc" command end
> >
> >rule "caution"
> > when
> > eval(Server.Message==8388608)
> > then
> > System.out.println("caution!The network maybe will get blocked very soon."); end
> >
> >rule "fluent network"
> > when
> > eval(Server.Message<8388608)#conditions
> > then
> > System.out.println("the current network is very good");
> > #actions
> >end
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
14 years, 9 months
Calling a method with varargs
by janders
Hey all, I've got a rule in a DRL file that I'm trying to call an object
method that contains a varargs parameter.
The method signature looks like so:
public void addMessage(int displayPriority, String messageFormat, Object...
messageArgs) {
The rule looks like so:
rule "Notice Quantity"
no-loop
when
$notice : Notice(quantity > 0);
then
$explanation.addMessage(1, "%s Quantity = %,d", $notice.dispositionCode,
$notice.quantity);
end
When I run this rule base, I get this runtime error from the Drools engine:
Caused by: [Error: unable to resolve method:
com.package.TriggerExplanation.addMessage(java.lang.Integer,
java.lang.String, java.lang.String, java.lang.Integer) [arglength=4]]
[Near : {... Unknown ....}]
This feels very much like either the MVEL engine or Drools can't resolve a
method with varargs. I found nothing in any of the documentation and the
only thread on these forums that references varargs was a few years old.
Can anyone tell me if Drools does/does not support method calls with
varargs? Doing this without varargs is going to be a galactic pain in the
butt.
Thanks!
Jason
--
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14 years, 9 months
Support for Probabilistic reasoning & FOL
by Arjun Dhar
Hi,
though it is clear Rule Engine (lke Drools) supports Declarative
programming and First order Logic or FOL (with existential quantifiers and
works) .... am also looking for Probabilistic Reasoning.
Example:
Fact: A U B => C; this fact exists with a probability of 0.9.
Principles namely being: Locality, Detachment, Truth functionality (i.e.
when predicates in facts are not mutually exclusive then probabilistic
calculations are not as simple as Boolean operations) etc.
Has such theory been worked into Drools yet or are there any plans for the
future?
I'd assume the same concepts can be used on Fuzzy rules and fuzzy sets.
Am sure these are practical issues that at some point the Drools team would
have thought about. Whats the direction on this?
thanks
--
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14 years, 9 months
completing persisted workItem doesn't complete a process
by gs76pl
hi,
i've a very simple process with only 4 work items that run async. For steps
WI1 & WI2 i complete each step but when the process reaches WI3 step i
manually kill the whole process and then load it from a database
i.e.
ksession.loadStatefullSess..
Now after i complete WI3 step i can see that the last step i.e. WI4 gets
executed and marked as completed but when i'm checking my process status its
status is still ACTIVE instead of COMPLETED ?
ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(
mySessionId, getKnowledgeBase(), null, getEnvironment());
ProcessInstance processInstance = ksession.getProcessInstance(myProcessId);
//after below line i can see that WI3 & WI4 get completed
ksession.getWorkItemManager().completeWorkItem(workItemIdForWI3, null);
//here the process still remains as ACTIVE ie.1
processInstance.getState() == ProcessInstance.STATE_ACTIVE
what i've seen in the tables is that all tables (i.e. processinstanceinfo,
variableinstanceinfo,workiteminfo) excepts sessionInfo gets cleared after
completing WI3. Why despite completing all work items the process remains
ACTIVE when in fact it should be COMPLETED
--
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14 years, 9 months
Re: [rules-users] help! the field *** is not visible
by John Peterson
Try adding 'dialect "mvel"' (no single quotes) after the rule name to the top of each of the rules. I have seen this error before and doing this resolved the issue.
>hello,everyone!I wrote a rule with Drools,but the error told me that the field Server.Message is not visible, I can't find how it happens. Please
>help me, I am almost exhausted with it. thank you.
>the rules are as follows:
>
>package com.sample
>import com.sample.Server;
>
>rule "system will execute 'tc' command"
> when
> eval(Server.Message>8388608)
> then
> System.out.println("The network is so crowd that it needs repairing.");
> Runtime.getRuntime().exec("tc");#execute the "tc" command end
>
>rule "caution"
> when
> eval(Server.Message==8388608)
> then
> System.out.println("caution!The network maybe will get blocked very soon."); end
>
>rule "fluent network"
> when
> eval(Server.Message<8388608)#conditions
> then
> System.out.println("the current network is very good");
> #actions
>end
14 years, 9 months
Insert an object containing a HashMap
by hbunny
Hello,
I have searched the forum for information on this case, but I haven't find,
at least yet.
I am trying to insert an object containing a HashMap, but when I call
ksession.insert( fact ) method I get this error:
java.lang.ClassCastException: java.util.HashMap cannot be cast to
java.lang.Comparable
I have searched the net for this kind of error, but it's not clear why I'm
getting it, especially that I am inserting with success a global HashMap.
Can you help me please, it is rather urgent. Thank you in advance.
--
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14 years, 9 months
help! the field *** is not visible
by 赵慧
hello,everyone!I wrote a rule with Drools,but the error told me that the field Server.Message is not visible, I can't find how it happens. Please help me, I am almost exhausted with it. thank you.
the rules are as follows:
package com.sample
import com.sample.Server;
rule "system will execute 'tc' command"
when
eval(Server.Message>8388608)
then
System.out.println("The network is so crowd that it needs repairing.");
Runtime.getRuntime().exec("tc");#execute the "tc" command
end
rule "caution"
when
eval(Server.Message==8388608)
then
System.out.println("caution!The network maybe will get blocked very soon.");
end
rule "fluent network"
when
eval(Server.Message<8388608)#conditions
then
System.out.println("the current network is very good");#actions
end
14 years, 9 months
