Re: howto BRMS - already stuck at fact model
by Chong Minsk Goh
Hi Darren,
Glad I am not alone : )
I am also in the process of using BRMS for our application. Would also
like to seek advice on how to better use the BRMS.
Especially on how the parsing of user inputs to DRL is executed,
specifically which package/api in drools is used.
Cheers!
Chong Minsk
>
> Message: 1
> Date: Wed, 14 Nov 2007 10:06:05 -0500
> From: "Darren Hartford" <dhartford(a)ghsinc.com>
> Subject: [rules-users] howto BRMS - already stuck at fact model
> loading
> To: <rules-users(a)lists.jboss.org>
> Message-ID:
> <214FF1B5E37DC84D9968F0F82FBB112502A010C4(a)AUGEXCH.ghsinc.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Hey all, new to BRMS as trying to learn how this works. My usecase is
> to take an existing, working EJB3 application and migrate some of the
> complex rules over to be managed by BRMS.
>
>
>
> However, initial attempts over the course of a couple of days have
> yielded zero results.
>
>
>
> When trying to follow
> http://downloads.jboss.com/drools/docs/4.0.3.15993.GA/html_single/index.
> html#d0e5301, they want you to load a fact model. I take an existing
> EJB3 entity bean and it loads fine. There doesn't seem anything more
> for me to do, or to verify this is o.k. or not. So, then I move to the
> rule editors, and nothing works - not able to use the guided editor at
> all, and using the DSL text editor with the 'model/entity' from the jar
> isn't recognized.
>
>
>
> Now, I admit ignorance, and I would like some direction as to how to
> best learn to use BRMS.
>
>
>
> There were a couple mentions of a drools-examples-brms, but it just can
> not be found. Following the documentation mentioned above is only
> guidelines without any good examples leaving one easily lost.
>
>
>
> http://www.google.com/search?q=drools-example-brms
>
> http://www.nabble.com/forum/Search.jtp?query=jbrms+example&local=y&forum
> =11822&daterange=0&startdate=&enddate=
>
> http://labs.jboss.com/drools/downloads.html
>
> http://labs.jboss.com/drools/livetrails/index.html
>
>
>
> So - where can one go to learn how to use BRMS to help convert an
> existing EJB3 application to use Drools and BRMS?
>
>
>
> Thanky,
>
> -D
>
18 years, 1 month
create XML rules with XML parser
by Raffaele Viola
Hi all,
I want to create automatically the xml containing the rules using a parser
like castor, which .xsd I have to use to generate the appropriate java
class?
Can someone give me some indications?
Thanks
Raffo
18 years, 1 month
RE: how to find duplicate
by Sikkandar Nawabjan
Hi,
am passing list of objects to working memory. i want to fire the rule if there is any duplicate objects in the list
i write code like this
when
$obj1:Object1($id:id,$name:name)
$obj2:Object1(id==$id,$name:name==$name,this!=$obj1)
then
fire rule
Now the problem lies at this!=objj1(a highlighted check). i put this to avoid a object check with itself.
But this is internally calling equals method of the corresponding object and always return true. Because i overriden equals method in the Object itself
so at the end the rule won't fire even if there is a duplicate object. how i can solve this
equals(Object obj){
if(this.id=obj.id&& this.name==obj.name)
return true;
else
return false;
}
Sikkandar Basha
Tech Lead WPEPDS
UST Global<http://intranet.ustri.com/email/UST-logo.jpg> B5N 144, Bhavani
Technopark, Trivandrum, India
sikkandar.nawabjan(a)ust-global.com <mailto:sikkandar.nawabjan@ust-global.com>
T: +91-471-2335777 Extn: 6802036
M: +91-9946555330
F: +91-471-2527276
________________________________
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Sent: Tue 11/13/2007 2:04 AM
To: rules-users(a)lists.jboss.org
Subject: rules-users Digest, Vol 12, Issue 27
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Today's Topics:
1. Re: Drools and jBPM integration (Fabian Weisensee)
2. Re: java.lang.OutOfMemoryError: Java heap space (Edson Tirelli)
3. Re: Drools and jBPM integration (Mark Proctor)
4. Re: Drools and jBPM integration (Mark Proctor)
----------------------------------------------------------------------
Message: 1
Date: Mon, 12 Nov 2007 18:23:06 +0100
From: Fabian Weisensee <fabian(a)weisensee.net>
Subject: Re: [rules-users] Drools and jBPM integration
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID: <47388BFA.3010009(a)weisensee.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Yes, thanks for your help. I'll try your suggestion for #2.
I resolved the deployment problem by myself. It was just a mistake with
the JBoss ESB deploying...
But now I have another problem. The rule file is found, but there seem
to be some problems with the parser.
The FireRulesActionHandler class from the jbpm wiki uses the following code:
RuleBaseImpl ruleBase = new RuleBaseImpl();
ruleBase.addPackage(pkg);
But the RuleBaseImpl class doesn't seem to be part of drools anymore. I
looked at the javadocs to find a replacement. I've found the
RuleBaseLoader class which looked like what I needed. I replaced the two
lines with this:
RuleBaseLoader rbl = RuleBaseLoader.getInstance();
RuleBase ruleBase = rbl.loadFromReader(reader);
ruleBase.addPackage(pkg);
but when I run this I get the following error:
ERROR [GraphElement] action threw exception: Unable to parser Reader
java.lang.RuntimeException: Unable to parser Reader
at org.drools.compiler.DrlParser.getParser(DrlParser.java:209)
at org.drools.compiler.DrlParser.parse(DrlParser.java:60)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:165)
at
org.drools.compiler.RuleBaseLoader.loadFromReader(RuleBaseLoader.java:38)
at
rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:92)
at
rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:49)
Of course I thought my rule file would be syntacticaly incorrect, but
even this rule file didn't work:
package rechnung.kontrolle
rule "test rule 1"
when
then
System.out.println("rule fired!");
end
What am I doing wrong? Is RulesBaseLoader the right class?
Are there any other Informations about integrating jBPM and Drools?
--Fabian
Aziz Boxwala schrieb:
> Fabian,
>
> Response to #1: I believe the rule file needs to reside in the root
> directory of the archive/directory of the example application. I have
> not tried that out so not sure.
>
> With Drools 4.0.x, you have the option of having your rules be located
> in the BRMS.
>
> Response to #2: You should be able to do so using one decision-node.
> Associate the rule action handler with either the Before Signal or Node
> Enter event and specify your decision conditions on the transitions out
> of that node..
>
> --Aziz
>
> ----- Original Message ----
> From: Fabian Weisensee <fabian(a)weisensee.net>
> To: rules-users(a)lists.jboss.org
> Sent: Monday, November 12, 2007 7:35:02 AM
> Subject: [rules-users] Drools and jBPM integration
>
> Hi there
>
> I have some questions concerning Drools and jBPM integration.
> I know there is this wiki page:
> http://wiki.jboss.org/wiki/Wiki.jsp?page=JbpmAndDrools
> but first it's not really detailed and second does it seem to be outdated.
>
> 1) I changed the FireRulesActionHandler from the wiki to reflect the
> API-changes, that at least it's compileable. In the jBPM process
> definition the rule file is simply passed as parameter like this:
> "/Shipper.drl". To which directory does this relative path apply? So
> where do I have to deploy this rule file? I tried several locations in
> the application server, but even with an absolute path every time
> FireRulesActionHandler tries to read the rule it crashes:
>
> ERROR [GraphElement] action threw exception: null
> java.lang.NullPointerException
> at java.io <http://java.io.Re <http://java.io.re/> >.Reader.<init>(Unknown Source)
> at java.io <http://java.io.In <http://java.io.in/> >.InputStreamReader.<init>(Unknown Source)
> at
> rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:83)
> at
> rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:50)
>
> 2) As I understood the example in the wiki you have to create a node
> which executes the rule and then a decision-node which routes the
> process flow according to the rule results.
> Is it possible to do this with just one node?
> But perhaps I should ask this at the jBPM forums.
>
> Every help would be appreciated. Thanks in advance.
>
> Fabian Weisensee
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
------------------------------
Message: 2
Date: Mon, 12 Nov 2007 16:35:56 -0200
From: "Edson Tirelli" <tirelli(a)post.com>
Subject: Re: [rules-users] java.lang.OutOfMemoryError: Java heap space
To: "Rules Users List" <rules-users(a)lists.jboss.org>
Message-ID:
<e6dd5ba30711121035j634309ebq14f21d73ad68ce36(a)mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Thanks for reporting and providing workaround. I will look into fixing
that.
2007/11/12, vdelbart <delbart.v(a)mipih.fr>:
>
>
> Hello,
>
> I add this 4 lines in my code before the session.dispose() and the problem
> disapear :
>
> session.removeEventListener((WorkingMemoryEventListener)logger);
> session.removeEventListener((AgendaEventListener)logger);
> session.removeEventListener((RuleFlowEventListener)logger);
> session.removeEventListener((RuleBaseEventListener)logger);
>
> regards,
>
> V.
>
>
>
> vdelbart wrote:
> >
> > Good morning,
> >
> > I found a workaround : don't use the WorkingMemoryFileLogger !
> >
> > I create an issue : http://jira.jboss.com/jira/browse/JBRULES-1325
> >
> > regards,
> >
> > V.
> >
> >
> > vdelbart wrote:
> >>
> >> Hello,
> >>
> >> In my tests of the 4.0.3, I have some : java.lang.OutOfMemoryError.
> >>
> >> So, I try a simple test with 10.000 sequential execution of 1 rule with
> >> no context and just a workingmemorylogger and I have the error :
> >> java.lang.OutOfMemoryError: Java heap space
> >>
> >> My code is :
> >>
> >> public class ExecReglesMemotyTest
> >> {
> >>
> >> private static final Reader DRL = new
> >> InputStreamReader(ExecReglesMemotyTest.class
> >> .getResourceAsStream("/rules/exemple.drl"));
> >>
> >> private static final String FICHIER_LOG = "session";
> >>
> >> /**
> >> * @param args
> >> */
> >> public static void main(String[] args)
> >> {
> >> try
> >> {
> >> PackageBuilder builder = new PackageBuilder();
> >> builder.addPackageFromDrl(DRL);
> >> RuleBase ruleBase = RuleBaseFactory.newRuleBase();
> >> ruleBase.addPackage(builder.getPackage());
> >> for (int i = 0; i < 10000; i++)
> >> {
> >> StatefulSession session =
> ruleBase.newStatefulSession();
> >> WorkingMemoryFileLogger logger = new
> >> WorkingMemoryFileLogger(session);
> >> logger.setFileName(FICHIER_LOG);
> >> session.fireAllRules();
> >> logger.writeToDisk();
> >> session.dispose();
> >> }
> >>
> >> }
> >> catch (Exception e)
> >> {
> >> // TODO Auto-generated catch block
> >> e.printStackTrace();
> >> }
> >> }
> >> }
> >>
> >> with this rule (doesn't matter):
> >> #created on: Fri Nov 09 15:48:45 CET 2007
> >> package initPackage
> >>
> >> #list any import classes here.
> >>
> >> rule "ERG9"
> >> when
> >>
> >> then
> >>
> >> end
> >>
> >> I try this in 4.0.1, and it's working (no OutOfMemoryError)
> >>
> >> What's the problem ?
> >>
> >> thanks for any information,
> >>
> >> V.
> >>
> >>
> >>
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/java.lang.OutOfMemoryError%3A-Java-heap-space-tf477...
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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Message: 3
Date: Mon, 12 Nov 2007 20:30:14 +0000
From: Mark Proctor <mproctor(a)codehaus.org>
Subject: Re: [rules-users] Drools and jBPM integration
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID: <4738B7D6.6060306(a)codehaus.org>
Content-Type: text/plain; charset="iso-8859-1"
Aziz Boxwala wrote:
> Fabian,
>
> Response to #1: I believe the rule file needs to reside in the root
> directory of the archive/directory of the example application. I have
> not tried that out so not sure.
We just take a Reader, so the file can be anywhere. In our examples we
tend to put stuff in the classpath as it makes for very easy loading.
>
> With Drools 4.0.x, you have the option of having your rules be located
> in the BRMS.
>
> Response to #2: You should be able to do so using one decision-node.
> Associate the rule action handler with either the Before Signal or
> Node Enter event and specify your decision conditions on the
> transitions out of that node..
>
> --Aziz
>
> ----- Original Message ----
> From: Fabian Weisensee <fabian(a)weisensee.net>
> To: rules-users(a)lists.jboss.org
> Sent: Monday, November 12, 2007 7:35:02 AM
> Subject: [rules-users] Drools and jBPM integration
>
> Hi there
>
> I have some questions concerning Drools and jBPM integration.
> I know there is this wiki page:
> http://wiki.jboss.org/wiki/Wiki.jsp?page=JbpmAndDrools
> but first it's not really detailed and second does it seem to be outdated.
>
> 1) I changed the FireRulesActionHandler from the wiki to reflect the
> API-changes, that at least it's compileable. In the jBPM process
> definition the rule file is simply passed as parameter like this:
> "/Shipper.drl". To which directory does this relative path apply? So
> where do I have to deploy this rule file? I tried several locations in
> the application server, but even with an absolute path every time
> FireRulesActionHandler tries to read the rule it crashes:
>
> ERROR [GraphElement] action threw exception: null
> java.lang.NullPointerException
> at java.io <http://java.io.Re <http://java.io.re/> >.Reader.<init>(Unknown Source)
> at java.io <http://java.io.In <http://java.io.in/> >.InputStreamReader.<init>(Unknown
> Source)
> at
> rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:83)
> at
> rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:50)
>
> 2) As I understood the example in the wiki you have to create a node
> which executes the rule and then a decision-node which routes the
> process flow according to the rule results.
> Is it possible to do this with just one node?
> But perhaps I should ask this at the jBPM forums.
>
> Every help would be appreciated. Thanks in advance.
>
> Fabian Weisensee
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
> https://lists.jboss.org/mailman/listinfo/rules-users
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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------------------------------
Message: 4
Date: Mon, 12 Nov 2007 20:33:59 +0000
From: Mark Proctor <mproctor(a)codehaus.org>
Subject: Re: [rules-users] Drools and jBPM integration
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID: <4738B8B7.2050309(a)codehaus.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Fabian Weisensee wrote:
> Yes, thanks for your help. I'll try your suggestion for #2.
>
> I resolved the deployment problem by myself. It was just a mistake
> with the JBoss ESB deploying...
>
> But now I have another problem. The rule file is found, but there seem
> to be some problems with the parser.
>
> The FireRulesActionHandler class from the jbpm wiki uses the following
> code:
> RuleBaseImpl ruleBase = new RuleBaseImpl();
> ruleBase.addPackage(pkg);
You should read the Drools docuemtation, heck every example we have
shows how to do this, and every example will show
RuleBase ruleBase = RuleBaseFactory.newRuleBase()
ruleBase.addPackage( pkg )
Where the pkg is created from the PackageBuilder class, again this is
all documented with full examples. What you are using, and someone
wrongly documented, was an internal implementation class, you should be
using the interface.
>
> But the RuleBaseImpl class doesn't seem to be part of drools anymore.
> I looked at the javadocs to find a replacement. I've found the
> RuleBaseLoader class which looked like what I needed. I replaced the
> two lines with this:
> RuleBaseLoader rbl = RuleBaseLoader.getInstance();
> RuleBase ruleBase = rbl.loadFromReader(reader);
> ruleBase.addPackage(pkg);
>
> but when I run this I get the following error:
>
> ERROR [GraphElement] action threw exception: Unable to parser Reader
> java.lang.RuntimeException: Unable to parser Reader
> at org.drools.compiler.DrlParser.getParser(DrlParser.java:209)
> at org.drools.compiler.DrlParser.parse(DrlParser.java:60)
> at
> org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:165)
>
> at
> org.drools.compiler.RuleBaseLoader.loadFromReader(RuleBaseLoader.java:38)
> at
> rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:92)
>
> at
> rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:49)
>
>
> Of course I thought my rule file would be syntacticaly incorrect, but
> even this rule file didn't work:
>
> package rechnung.kontrolle
>
> rule "test rule 1"
> when
> then
> System.out.println("rule fired!");
> end
>
> What am I doing wrong? Is RulesBaseLoader the right class?
> Are there any other Informations about integrating jBPM and Drools?
>
> --Fabian
>
>
>
> Aziz Boxwala schrieb:
>> Fabian,
>>
>> Response to #1: I believe the rule file needs to reside in the root
>> directory of the archive/directory of the example application. I have
>> not tried that out so not sure.
>>
>> With Drools 4.0.x, you have the option of having your rules be
>> located in the BRMS.
>>
>> Response to #2: You should be able to do so using one decision-node.
>> Associate the rule action handler with either the Before Signal or
>> Node Enter event and specify your decision conditions on the
>> transitions out of that node..
>>
>> --Aziz
>>
>> ----- Original Message ----
>> From: Fabian Weisensee <fabian(a)weisensee.net>
>> To: rules-users(a)lists.jboss.org
>> Sent: Monday, November 12, 2007 7:35:02 AM
>> Subject: [rules-users] Drools and jBPM integration
>>
>> Hi there
>>
>> I have some questions concerning Drools and jBPM integration.
>> I know there is this wiki page:
>> http://wiki.jboss.org/wiki/Wiki.jsp?page=JbpmAndDrools
>> but first it's not really detailed and second does it seem to be
>> outdated.
>>
>> 1) I changed the FireRulesActionHandler from the wiki to reflect the
>> API-changes, that at least it's compileable. In the jBPM process
>> definition the rule file is simply passed as parameter like this:
>> "/Shipper.drl". To which directory does this relative path apply? So
>> where do I have to deploy this rule file? I tried several locations in
>> the application server, but even with an absolute path every time
>> FireRulesActionHandler tries to read the rule it crashes:
>>
>> ERROR [GraphElement] action threw exception: null
>> java.lang.NullPointerException
>> at java.io <http://java.io.Re <http://java.io.re/> >.Reader.<init>(Unknown Source)
>> at java.io <http://java.io.In <http://java.io.in/> >.InputStreamReader.<init>(Unknown
>> Source)
>> at
>> rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:83)
>>
>> at
>> rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:50)
>>
>>
>> 2) As I understood the example in the wiki you have to create a node
>> which executes the rule and then a decision-node which routes the
>> process flow according to the rule results.
>> Is it possible to do this with just one node?
>> But perhaps I should ask this at the jBPM forums.
>>
>> Every help would be appreciated. Thanks in advance.
>>
>> Fabian Weisensee
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
------------------------------
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End of rules-users Digest, Vol 12, Issue 27
*******************************************
18 years, 1 month
Views???
by ...
Hi,
I 'm new to drools and want to see how the views work(The Agenda
View,The Working Memory View,...). I have created a rule project and a
break point at
workingMemory.fireAllRules() line in sample class and debugged it as
drools application. After I have selected the working memory variable
as explained in the documentation and opened the Agenda View or the
other views, I got this message:
java.lang.NoClassDefFoundError:
org/eclipse/debug/internal/ui/contexts/provisional/IDebugContextListener
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620) ....
How can I use this views?Did I do something wrong or maybe forget any thing?
thanks in advanced.
M.A
18 years, 1 month
Re: [rules-users] Drools and jBPM integration
by Aziz Boxwala
Fabian,
Response to #1: I believe the rule file needs to reside in the root directory of the archive/directory of the example application. I have not tried that out so not sure.
With Drools 4.0.x, you have the option of having your rules be located in the BRMS.
Response to #2: You should be able to do so using one decision-node. Associate the rule action handler with either the Before Signal or Node Enter event and specify your decision conditions on the transitions out of that node..
--Aziz
----- Original Message ----
From: Fabian Weisensee <fabian(a)weisensee.net>
To: rules-users(a)lists.jboss.org
Sent: Monday, November 12, 2007 7:35:02 AM
Subject: [rules-users] Drools and jBPM integration
Hi there
I have some questions concerning Drools and jBPM integration.
I know there is this wiki page:
http://wiki.jboss.org/wiki/Wiki.jsp?page=JbpmAndDrools
but first it's not really detailed and second does it seem to be
outdated.
1) I changed the FireRulesActionHandler from the wiki to reflect the
API-changes, that at least it's compileable. In the jBPM process
definition the rule file is simply passed as parameter like this:
"/Shipper.drl". To which directory does this relative path apply? So
where do I have to deploy this rule file? I tried several locations in
the application server, but even with an absolute path every time
FireRulesActionHandler tries to read the rule it crashes:
ERROR [GraphElement] action threw exception: null
java.lang.NullPointerException
at java.io.Reader.<init>(Unknown Source)
at java.io.InputStreamReader.<init>(Unknown Source)
at
rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:83)
at
rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:50)
2) As I understood the example in the wiki you have to create a node
which executes the rule and then a decision-node which routes the
process flow according to the rule results.
Is it possible to do this with just one node?
But perhaps I should ask this at the jBPM forums.
Every help would be appreciated. Thanks in advance.
Fabian Weisensee
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18 years, 1 month
Drools and jBPM integration
by Fabian Weisensee
Hi there
I have some questions concerning Drools and jBPM integration.
I know there is this wiki page:
http://wiki.jboss.org/wiki/Wiki.jsp?page=JbpmAndDrools
but first it's not really detailed and second does it seem to be outdated.
1) I changed the FireRulesActionHandler from the wiki to reflect the
API-changes, that at least it's compileable. In the jBPM process
definition the rule file is simply passed as parameter like this:
"/Shipper.drl". To which directory does this relative path apply? So
where do I have to deploy this rule file? I tried several locations in
the application server, but even with an absolute path every time
FireRulesActionHandler tries to read the rule it crashes:
ERROR [GraphElement] action threw exception: null
java.lang.NullPointerException
at java.io.Reader.<init>(Unknown Source)
at java.io.InputStreamReader.<init>(Unknown Source)
at
rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:83)
at
rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java:50)
2) As I understood the example in the wiki you have to create a node
which executes the rule and then a decision-node which routes the
process flow according to the rule results.
Is it possible to do this with just one node?
But perhaps I should ask this at the jBPM forums.
Every help would be appreciated. Thanks in advance.
Fabian Weisensee
18 years, 1 month
How to define Enum in the decision table
by wyf
hi all:
In my tests of the 4.0.3,How can I define java1.5 Enum In the Excel decision table as a condition?
I have a enum like this:
public enum JobStatus {
UNEMPLOYED,EMPLOYED,RETIRED
}
I know i have to get a rule like this:
rule "EMPLOYED test"
no-loop true
when
$moneys:List()
$person:Person(jobstatus == JobStatus.EMPLOYED)
then
System.out.println( "EMPLOYED"+$person.getName());
$moneys.add(new Money(2));
retract($person);
end
I have Tryed define condition like JobStatus.EMPLOYED, EMPLOYED,"EMPLOYED", but nothing work!
I found JobStatus.EMPLOYED was convert to
$person:Person(jobstatus == "JobStatus.EMPLOYED")
buy the SpreadsheetCompiler
So, I Guess the decision table does not support java1.5 Enum??
thanks for any information
tobato
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18 years, 1 month
Rules for Hierarchical Type Calculation Formulas
by Don Cameron
We have been using a custom rules engine successfully for our 1000+
rules for our student loans application, but these rules are decision
based types rules (if then else).
For assessing loan amounts for our student loan application, we have
over 400+ calculation formulas plus decision logic. These formulas are
mostly simple:
TotalEligilbleLoanAmount = Min(TotalNeed - TotalResource,
MaxAllowedAmount)
TotalNeed = Tuition + LivingAllowance + ChildCareExpenses
ChildCareExpenses = NumberOfChildren * PerChildAmount
TotalResource = EmploymentEarnings + Scholarships + Assets
(however there are 400+ formulas and the hierarchy gets up to 20 deep)
Is it possible to implement something like this in Drools? Will it be
maintainable and performant?
Thanks
Don
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18 years, 1 month
compound LHS error, getting "Parser error. Contact Dev Team"
by Eric Miles
I have a compound LHS statement that is causing the parser to fail.
Here is my exact stacktrace:
org.drools.compiler.DroolsParserException: Unknown error while parsing.
This is a bug. Please contact the Development team.
at org.drools.compiler.DrlParser.compile(DrlParser.java:183)
at org.drools.compiler.DrlParser.parse(DrlParser.java:61)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:165)
at
com.kronos.webta.service.security.access.rules.WriteRestrictionsRulesTest.setUpBeforeClass(WriteRestrictionsRulesTest.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.junit.internal.runners.ClassRoadie.runBefores(ClassRoadie.java:49)
at
org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:36)
at
org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
This is the statement that is causing me problems:
not(UserRole((role == Role.TIMEKEEPER, delegateFor == $supId) || (role
== Role.SUPERVISOR, delegateFor == $tkpId)) from $actorRoles)
Remote out one of the conditions from the ||, it compiles fine. Such
as:
not(UserRole(role == Role.SUPERVISOR, delegateFor == $supId) from
$actorRoles)
or
not(UserRole(role == Role.TIMEKEEPER, delegateFor == $tkpId) from
$actorRoles)
Is my syntax incorrect or is there a bug?
Thanks!
18 years, 1 month
