[rules-users] Facing Problem in BRL
Sumeet Karawal
sumeet.karawal at tcs.com
Wed May 18 08:22:26 EDT 2011
Hi,
I am now able to run the examples (by removing the commented statements in
the drools.package file). Thanks a lot for the help.
But how can we create more rules in a brl . Is it possible to create more
than one rule in a brl
as we do in the drl file or do we have to create different brl files for
different rules.
Also is there a way to use the brl directly as we use drl.
Like using :
builder.add (ResourceFactory.newClassPathResource("com/rules/discount.brl"
),ResourceType.BRL);
Thanks & Regards,
Sumeet Karawal
Mailto: sumeet.karawal at tcs.com
From: Michael Anstis <michael.anstis at gmail.com>
To: Rules Users List <rules-users at lists.jboss.org>
Date: 05/18/2011 03:31 PM
Subject: Re: [rules-users] Facing Problem in BRL
Sent by: rules-users-bounces at lists.jboss.org
I just checked and when I create a new BRL rule drools.packages has the
comment on a single line.
I must assume there was some manual change made to introduce the error.
2011/5/18 Wolfgang Laun <wolfgang.laun at gmail.com>
There is some code in 5.1.1
org/drools/eclipse/rulebuilder/editors/RuleEditor.java
that creates a file "drools.package" with
if ( !file.exists() ) {
String defaultHeader = "//This is a package
configuration file";
defaultHeader += "\n//Add imports, globals etc here
which will be used by all the rule assets in this folder.";
InputStream is = new ByteArrayInputStream
( defaultHeader.getBytes() );
Note the missing newline at the end of defaultHeader.
-W
2011/5/18 Michael Anstis <michael.anstis at gmail.com>
//Add imports, globals etc here which will be used by all the rule
assets
in this folder.
should be on one line, or add another comment marker at the start of the
second line, e.g.:-
//Add imports, globals etc here which will be used by all the rule
assets in this folder.
//Add imports, globals etc here which will be used by all the rule
assets
// in this folder.
2011/5/18 Abhay B. Chaware <Abhay.Chaware at kpitcummins.com>
I was able to reproduce your error … J try adding a new line
( enter ) after the comment in the drools.package …. Or just remove
the commented line “//Add imports, globals etc here which will be used
by all the rule assets in this folder.”
Your rule name is getting ‘commented out’ ………
-abhay
-----------------------
From: rules-users-bounces at lists.jboss.org [mailto:
rules-users-bounces at lists.jboss.org] On Behalf Of Michael Anstis
Sent: Wednesday, May 18, 2011 2:53 PM
To: Rules Users List
Subject: Re: [rules-users] Facing Problem in BRL
This looks rogue:-
//Add imports, globals etc here which will be used by all the rule
assets
in this folder
Can you post the content of your drools.packages file?
On 18 May 2011 10:19, Sumeet Karawal <sumeet.karawal at tcs.com> wrote:
This is the output that I get :
//This is a package configuration file
package com.rules;
import com.model.PersonDetails;
//Add imports, globals etc here which will be used by all the rule
assets
in this folder.rule "example"
dialect "mvel"
when
$person : PersonDetails( age < "20" )
then
$person.setDiscount( 10 );
end
java.lang.RuntimeException: [8,1]: [ERR 102] Line 8:1 mismatched input
'WHEN'
Regards,
Sumeet Karawal
Mailto: sumeet.karawal at tcs.com
From: "Abhay B. Chaware" <Abhay.Chaware at kpitcummins.com>
To: Rules Users List <rules-users at lists.jboss.org>
Date: 05/18/2011 02:47 PM
Subject: Re: [rules-users] Facing Problem in BRL
Sent by: rules-users-bounces at lists.jboss.org
Can you write the outputDRL to System.out and check if the generated
DRL
syntax is correct ?
System.out.println(outputDRL);
Before instantiating KnowledgeBuilder
-----Original Message-----
From: rules-users-bounces at lists.jboss.org [
mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Sumeet
Karawal
Sent: Wednesday, May 18, 2011 2:42 PM
To: Rules Users List
Subject: Re: [rules-users] Facing Problem in BRL
I tried to use this also but now I am getting different error:
java.lang.RuntimeException: [8,1]: [ERR 102] Line 8:1 mismatched input
'WHEN'
Also, what is the significance of the first line. I have copied it as
the
same.
My code is :
String curDir = System.getProperty("user.dir");
String fileName = curDir + "\\src\\com\\rules
\\drools.package";
String rulePackageContent = FileUtils.readFileToString
(new
File
(fileName));
fileName = curDir + "\\src\\com\\rules\\example.brl";
String brl = FileUtils.readFileToString(new File
(fileName));
BRLPersistence read = BRXMLPersistence.getInstance();
BRLPersistence write = BRDRLPersistence.getInstance();
String outputDRL = rulePackageContent + write.marshal
(read.unmarshal
(brl));
KnowledgeBuilder builder = KnowledgeBuilderFactory.
newKnowledgeBuilder();
builder.add(ResourceFactory.newReaderResource(new
StringReader
(outputDRL)), ResourceType.DRL);
if (builder.hasErrors()) {
throw new RuntimeException (builder.getErrors().toString ());
}
KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase
();
knowledgeBase.addKnowledgePackages(builder.getKnowledgePackages
());
I don't know where I am getting this wrong.
Regards,
Sumeet Karawal
Mailto: sumeet.karawal at tcs.com
From: "Abhay B. Chaware" <Abhay.Chaware at kpitcummins.com>
To: Rules Users List <rules-users at lists.jboss.org>
Date: 05/18/2011 01:09 PM
Subject: Re: [rules-users] Facing Problem in BRL
Sent by: rules-users-bounces at lists.jboss.org
I haven't been able to get "ResourceType.BRL" to work. This is how I
do
it ..
String curDir = System.getProperty("user.dir");
String fileName = curDir + "\\src\\main\\rules\\drools.package";
String rulePackageContent = FileUtils.readFileToString(new File
(fileName));
fileName = curDir + "\\src\\main\\rules\\eligibility.brl";
String brl = FileUtils.readFileToString(new File(fileName));
BRLPersistence read = BRXMLPersistence.getInstance();
BRLPersistence write = BRDRLPersistence.getInstance();
String outputDRL = rulePackageContent + write.marshal(read.unmarshal
(brl));
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newReaderResource(new StringReader
(outputDRL)), ResourceType.DRL);
Try this.
-abhay
-----Original Message-----
From: rules-users-bounces at lists.jboss.org [
mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Sumeet
Karawal
Sent: Wednesday, May 18, 2011 11:47 AM
To: Rules Users List
Subject: Re: [rules-users] Facing Problem in BRL
This is the brl that I have created:
(Embedded image moved to file: pic18001.jpg)
Regards,
Sumeet Karawal
Mailto: sumeet.karawal at tcs.com
From: "Abhay B. Chaware" <Abhay.Chaware at kpitcummins.com>
To: Rules Users List <rules-users at lists.jboss.org>
Date: 05/18/2011 11:42 AM
Subject: Re: [rules-users] Facing Problem in BRL
Sent by: rules-users-bounces at lists.jboss.org
Could you post your rule content here ?
-----Original Message-----
From: rules-users-bounces at lists.jboss.org [
mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Sumeet
Karawal
Sent: Wednesday, May 18, 2011 11:38 AM
To: rules-users at lists.jboss.org
Subject: [rules-users] Facing Problem in BRL
Hi,
I am using Drools-Expert. I am having a class "Person" with data
members as
age and discount.
I am trying to create a .brl. I have these statements in
drools.package
package com.rules;
import com.model.PersonDetails;
and in the example.brl I am providing the details of when and then
conditions
but on execution I am getting the following error :
java.lang.RuntimeException: [4] Unable to expand: PersonDetails( age <
"20" )[6] Unable to expand:
PersonDetails fact0 = new
PersonDetails
();[7] Unable to expand:
fact0.setDiscount
( 10 );[8] Unable to
expand:
insert(fact0 );
It would be helpful is somebody guide me on how execute it.
Also, I am creating the knowledgebase as:
private static KnowledgeBase createKnowledgeBase() {
KnowledgeBuilder builder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
builder.add (ResourceFactory.newClassPathResource(
"com/rules/example.brl"),ResourceType.BRL);
if (builder.hasErrors()) {
throw new RuntimeException (builder.getErrors().toString ());
}
KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase
();
knowledgeBase.addKnowledgePackages(builder.getKnowledgePackages
());
return knowledgeBase;}
Thanks & Regards,
Sumeet Karawal
CEG - Open Source Technology Group
Tata Consultancy Services
Ph:- +912267782556
Cell:- +919833236440
Mailto: sumeet.karawal at tcs.com
Website: http://www.tcs.com
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