Re: [rules-users] Drools issue
by djb
Hi, you're allowed to call any java in the then clause. The when clause,
however, is in a logic syntax.
Remember, you will have to import any classes that you use.
But usually you'll only want to access globals. Otherwise you are modifying
or updating or inserting variables that you linked in the when section.
So, you probably want:
global com.my.Results results;
if you wanted to access your global results variable. And of course, you'll
need to declare that global with setGlobal in the code. There are examples
in the documentation.
--
View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Drools-issue-tp951185...
Sent from the Drools - User mailing list archive at Nabble.com.
14 years, 5 months
Re: [rules-users] Drools issue
by djb
Hi, you're allowed to call any java in the then clause. The when clause,
however, is in a logic syntax.
Remember, you will have to import any classes that you use.
But usually you'll only want to access globals. Otherwise you are modifying
or updating or inserting variables that you linked in the when section.
So, you probably want:
global com.my.Results results;
if you wanted to access your global results variable. And of course, you'll
need to declare that global with setGlobal in the code. There are examples
in the documentation.
--
View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Drools-issue-tp951185...
Sent from the Drools - User mailing list archive at Nabble.com.
14 years, 5 months
What Drools library should be used with JDK 1.6 ?
by Tatyana Polnyi
What Drools library should be used with JDK 1.6 ?
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14 years, 5 months
Re: [rules-users] rules-users Digest, Vol 44, Issue 16
by Axelrod, Nelson
Hi Edson,
Yes, I have been writing and checking the audit log. It shows several
activations of the "test" rule, and I've pasted them below if that
helps. There are no other activation events with fact handles to [19,
6313, 3681] except for the "test" rule.
These two rules intentionally do not have any side effects written in
the RHS, specifically to avoid the case that an activation of one rule
would somehow lead to a change affecting the LHS of another rule or any
other side effects. I load all of the facts before the rules, and no
other code is executed except for the KnowledgeSession fireAllRules()
method followed by dispose().
<org.drools.audit.event.ActivationLogEvent>
<type>4</type>
<activationId>test [19, 6313, 3681]</activationId>
<rule>test</rule>
<declarations>f=Feature.ORF00019(19);
hit=org.jcvi.annotation.facts.HmmHit.ORF00019.TIGR00549.ABOVE_TRUSTED.13
836
502(3681); p=FeatureProperty.TIGR00549(6313)</declarations>
</org.drools.audit.event.ActivationLogEvent>
<org.drools.audit.event.ActivationLogEvent>
<type>6</type>
<activationId>test [19, 6313, 3681]</activationId>
<rule>test</rule>
<declarations>f=Feature.ORF00019(19);
hit=org.jcvi.annotation.facts.HmmHit.ORF00019.TIGR00549.ABOVE_TRUSTED.13
836
502(3681); p=FeatureProperty.TIGR00549(6313)</declarations>
</org.drools.audit.event.ActivationLogEvent>
<org.drools.audit.event.ActivationLogEvent>
<type>7</type>
<activationId>test [19, 6313, 3681]</activationId>
<rule>test</rule>
<declarations>f=Feature.ORF00019(19);
hit=org.jcvi.annotation.facts.HmmHit.ORF00019.TIGR00549.ABOVE_TRUSTED.13
836
502(3681); p=FeatureProperty.TIGR00549(6313)</declarations>
</org.drools.audit.event.ActivationLogEvent>
Nelson
----------------------------------------------------------------------
Message: 1
Date: Tue, 6 Jul 2010 12:39:22 -0400
From: Edson Tirelli <tirelli(a)post.com>
Subject: Re: [rules-users] How is this possible?
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID:
<AANLkTik_Ge7ay6M4gcakpUAgccshwCmU7ke2IYNFJhg6(a)mail.gmail.com>
Content-Type: text/plain; charset="windows-1252"
Nelson,
How do you know one rule is firing, but not the other? Are you
checking
the audit log or using an agenda listener for that? Otherwise, if you
think
the rule is not firing because of your println in the consequence, you
might
be looking at the wrong "symptom". There is a huge difference between
writing an "if" like that in the consequence of a rule and writing a
constraint like "hitId == "TIGR00549"" in the condition of the rule,
because
the LHS of a rule is evaluated at "insert" time while the RHS is
evaluated
at the consequence fire time.
So, from the information given, trying to imagine a scenario to
explain
why the syserr in the "test" rule shows up while the one in the first
rule
doesn't, here is a possible explanation:
* You insert the fact HmmHit, it activates both rules, but in a given
time,
before the "Hmm Hit" rule is fired, the value of hitId changes. In this
case, the rule would still fire, but the "if" in the consequence is only
evaluated after the change (during consequence fire time) and so
evaluates
to false, not printing the message.
This is a pretty simple use case and we have several customers/users
with
thousands of rules and millions of facts in a single session and they
are
not facing anything like you described. So, while a bug is always a
possible
explanation, we need a way to reproduce your problem in order to give
you a
proper answer.
Edson
*******************************************
14 years, 5 months
Re: [rules-users] Problem Setting globals in drools session
by Greg Barton
Let's keep this on the list. Also, since your reply text is at the end of the email I'll repaste it below:
--- On Tue, 7/6/10, djerir smail <1983djerir(a)gmail.com> wrote:
> > Thank you for your
> response,my application is deployed in Mobicents slee AS, I
> think it uses multiple classloaders .how can I fix that
> please
> >
I've never used Mobicents before so I don't have the first clue, but a quick google on "mobicents classloader" returns this as the first result:
http://markmail.org/message/z3sy5gtaghxc3366
>From that link: "Working with classpaths/URLs would result the same class to be loaded in multiple classloaders, and then you would have linkage errors when passing from one component to other..." Sounds familiar. :) There should be some solution in Mobicents for passing objects between components such that they share a common class.
--- On Tue, 7/6/10, djerir smail <1983djerir(a)gmail.com> wrote:
> From: djerir smail <1983djerir(a)gmail.com>
> Subject: Re: [rules-users] Problem Setting globals in drools session
> To: "Greg Barton" <greg_barton(a)yahoo.com>
> Date: Tuesday, July 6, 2010, 2:25 PM
> Greg Barton a écrit :
> > Does your application use multiple classloaders? It's
> possible for two instances with the same class definition to
> not have "equal" classes if the class is loaded twice from
> different classloaders.
> >
> > --- On Mon, 7/5/10, djerir smail <1983djerir(a)gmail.com>
> wrote:
> >
> >
> >> From: djerir smail <1983djerir(a)gmail.com>
> >> Subject: [rules-users] Problem Setting globals in
> drools session
> >> To: "Rules Users List" <rules-users(a)lists.jboss.org>
> >> Date: Monday, July 5, 2010, 2:38 PM
> >> Hello everybody,
> >>
> >> When I try to sett my globals I get this
> error
> >>
> >> 2010-07-05 21:26:04,531 ERROR [STDERR]
> >> java.lang.RuntimeException: Illegal class for
> global. Expected
> >> [ulb.mfe.srabre.ra.BREINTERFACE], found
> [ulb.mfe.srabre.ra.BREINTERFACE].
> >>
> >> Can anyone explain to me what does this error mean
> please
> >> .
> >>
> >> MY DRL FILE
> >>
> >> package ulb.mfe.srabre.rule
> >>
> >> import ulb.mfe.srabre.ra.BREINTERFACE;
> >> import ulb.mfe.srabre.ra.DROOLSSLEEAgent;
> >>
> >> global ulb.mfe.srabre.ra.BREINTERFACE
> BRERAInterface;
> >> global ulb.mfe.srabre.ra.DROOLSSLEEAgent
> DROOLSSLEEAgent;
> >>
> >> rule "MaxBtsAlarmrule"
> >> dialect "mvel"
> >>
> >> when
> >>
> >> $B : BREINTERFACE()
> >> then
> >> System.out.println(" HELLO
> ");
> >> end
> >>
> >>
> >>
> >>
> >> my code
> >>
> >>
> >> public void Insert(Object fact) {
> >> try{
> KnowledgeSessionConfiguration
> >> sessConfig =
> KnowledgeBaseFactory.newKnowledgeSessionConfiguration();
> >>
> sessConfig.setOption(ClockTypeOption.get("pseudo"));
> >>
> StatefulKnowledgeSession
> >> session =
> knowledgeBase.newStatefulKnowledgeSession();
> >>
> session.setGlobal("BRERAInterface", this.breinter);
> >>
> session.setGlobal("DROOLSSLEEAgent", this.droolssleeAgent);
> >>
> session.insert(this.breinter);
> >>
> System.out.println("Fact is now
> >> inserted");
> >>
> session.fireAllRules();
> >> } catch (Throwable t) {
> >>
> logger.info("sml couldn't set
> >> up a session");
> >>
> t.printStackTrace();
> >> }
> >> }
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users(a)lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >>
> >
> >
> > Thank you for your
> response,my application is deployed in Mobicents slee AS, I
> think it uses multiple classloaders .how can I fix that
> please
> >
>
>
14 years, 5 months
Re: [rules-users] rules-users Digest, Vol 44, Issue 15
by Greg Barton
I think isolating it in a test case is the best way. Like Edson said, this is a simple use case, proven trouble free many times over by many drools users. Isolating the test case will either show you where the funky behavior is happening on your side, or provide a comprehensible regression test for the drools devs to use.
GreG
On Jul 6, 2010, at 12:34 PM, "Axelrod, Nelson" <naxelrod(a)jcvi.org> wrote:
Hi Greg,
I've tried to adjust/increase the JVMP heap memory but that does not
help solve this problem. I've set the VM option
-XX:+HeapDumpOnOutOfMemoryError. No heap dump files are generated, so I
assume that is not the problem either.
I can isolate this problem within a test case and add a bug report to
Drools JIRA. Any other ideas as to how else this could occur, or how to
troubleshoot this further? It is really disconcerting.
Thanks,
Nelson
------------------------------
Message: 3
Date: Tue, 6 Jul 2010 09:05:16 -0700 (PDT)
From: Greg Barton <greg_barton(a)yahoo.com>
Subject: Re: [rules-users] How is this possible?
To: Rules Users List <rules-users(a)lists.jboss.org>
Cc: "Richter, Alexander" <ARichter(a)jcvi.org>,
"<rules-users(a)lists.jboss.org>" <rules-users(a)lists.jboss.org>
Message-ID: <376326.67572.qm(a)web81506.mail.mud.yahoo.com>
Content-Type: text/plain; charset="utf-8"
Does the amount of heap allocated affect it? I'm wondering if there's a
hidden OutOfMemoryError happening. (Which, if you're catching Throwable
anywhere, is a possibility. Use the HeapDumpOnOutOfMemoryError VM flag
to diagnose this.) And this should be easy to reproduce in your unit
tests: just insert many unrelated objects into working memory during
the test. In fact you could construct tests thst show the same code
succeeding without the excess objects then failing with them. That
would be essential if you think this is a core drools problem and want
it fixed.
GreG
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
14 years, 5 months
Re: [rules-users] rules-users Digest, Vol 44, Issue 15
by Axelrod, Nelson
Hi Greg,
I've tried to adjust/increase the JVMP heap memory but that does not
help solve this problem. I've set the VM option
-XX:+HeapDumpOnOutOfMemoryError. No heap dump files are generated, so I
assume that is not the problem either.
I can isolate this problem within a test case and add a bug report to
Drools JIRA. Any other ideas as to how else this could occur, or how to
troubleshoot this further? It is really disconcerting.
Thanks,
Nelson
------------------------------
Message: 3
Date: Tue, 6 Jul 2010 09:05:16 -0700 (PDT)
From: Greg Barton <greg_barton(a)yahoo.com>
Subject: Re: [rules-users] How is this possible?
To: Rules Users List <rules-users(a)lists.jboss.org>
Cc: "Richter, Alexander" <ARichter(a)jcvi.org>,
"<rules-users(a)lists.jboss.org>" <rules-users(a)lists.jboss.org>
Message-ID: <376326.67572.qm(a)web81506.mail.mud.yahoo.com>
Content-Type: text/plain; charset="utf-8"
Does the amount of heap allocated affect it? I'm wondering if there's a
hidden OutOfMemoryError happening. (Which, if you're catching Throwable
anywhere, is a possibility. Use the HeapDumpOnOutOfMemoryError VM flag
to diagnose this.) And this should be easy to reproduce in your unit
tests: just insert many unrelated objects into working memory during
the test. In fact you could construct tests thst show the same code
succeeding without the excess objects then failing with them. That
would be essential if you think this is a core drools problem and want
it fixed.
GreG
14 years, 5 months
How is this possible?
by Axelrod, Nelson
Hi,
We're having some troubling problems that can be best explained by the
following two rules. Based on the facts inserted into the stateful
knowledge session, we expected both rules to fire for an Hmm Hit to
TIGR00549, but only the "Test" rule fires. Can anyone explain how this
could possibly occur? There are no other rules added to the knowledge
base. This was tested using Drools 5.0 on Windows XP and Linux
environments.
rule "HMM Hit"
when
hit : HmmHit( aboveTrustedHit == true )
p : FeatureProperty( id == hit.hitId )
f : Feature ( featureId == hit.queryId, properties not
contains p )
then
if (hit.getHitId().equals("TIGR00549")) {
System.err.println("HMM Hit rule: " + hit.getHitId() +
" " + hit.getQueryId());
}
end
rule "Test"
when
hit : HmmHit( aboveTrustedHit == true, hitId == "TIGR00549")
p : FeatureProperty( id == hit.hitId )
f : Feature ( featureId == hit.queryId, properties not
contains p )
then
System.err.println("Test rule: " + hit.getHitId() + " " +
hit.getQueryId());
end
Notably, this error is dependent on the amount and/or order of facts
loaded into the knowledge session although we're talking < 20k facts
total. We have repeatedly found problems when running system-level
tests of our production rules that do not appear when we run our unit
tests, with issues such as this one that only show up after loading some
number of facts that are unrelated to the particular fact in question.
It's difficult to debug because we can see that fact handles that
satisfy the when conditions are in the knowledge session (i.e. the same
facts that fulfill the Test rule), but we do not have any obvious way to
debug why the expected HMM Hit rule does not fire.
Nelson
14 years, 5 months
Re: [rules-users] How is this possible?
by Greg Barton
Does the amount of heap allocated affect it? I'm wondering if there's a hidden OutOfMemoryError happening. (Which, if you're catching Throwable anywhere, is a possibility. Use the HeapDumpOnOutOfMemoryError VM flag to diagnose this.) And this should be easy to reproduce in your unit tests: just insert many unrelated objects into working memory during the test. In fact you could construct tests thst show the same code succeeding without the excess objects then failing with them. That would be essential if you think this is a core drools problem and want it fixed.
GreG
On Jul 6, 2010, at 10:28 AM, "Axelrod, Nelson" <naxelrod(a)jcvi.org> wrote:
Hi,
We’re having some troubling problems that can be best explained by the following two rules. Based on the facts inserted into the stateful knowledge session, we expected both rules to fire for an Hmm Hit to TIGR00549, but only the “Test” rule fires. Can anyone explain how this could possibly occur? There are no other rules added to the knowledge base. This was tested using Drools 5.0 on Windows XP and Linux environments.
rule "HMM Hit"
when
hit : HmmHit( aboveTrustedHit == true )
p : FeatureProperty( id == hit.hitId )
f : Feature ( featureId == hit.queryId, properties not contains p )
then
if (hit.getHitId().equals("TIGR00549")) {
System.err.println("HMM Hit rule: " + hit.getHitId() + " " + hit.getQueryId());
}
end
rule "Test"
when
hit : HmmHit( aboveTrustedHit == true, hitId == "TIGR00549")
p : FeatureProperty( id == hit.hitId )
f : Feature ( featureId == hit.queryId, properties not contains p )
then
System.err.println("Test rule: " + hit.getHitId() + " " + hit.getQueryId());
end
Notably, this error is dependent on the amount and/or order of facts loaded into the knowledge session although we’re talking < 20k facts total. We have repeatedly found problems when running system-level tests of our production rules that do not appear when we run our unit tests, with issues such as this one that only show up after loading some number of facts that are unrelated to the particular fact in question. It’s difficult to debug because we can see that fact handles that satisfy the when conditions are in the knowledge session (i.e. the same facts that fulfill the Test rule), but we do not have any obvious way to debug why the expected HMM Hit rule does not fire.
Nelson
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
14 years, 5 months
