XML to DRL
by T-Otte
Hello,
I know that this error has come up a few times in the past, but i wasn't
able to solve my problem.
I am trying to convert documents from the drools xml format to .drl using
drools 5.1.
The error i am getting is:
(null: 5, 76): schema_reference.4: Failed to read schema document
'drools.org/drools-5.0.xsd', because 1) could not find the document; 2) the
document could not be read; 3) the root element of the document is not
<xsd:schema>.
(null: 5, 76): cvc-elt.1: Cannot find the declaration of element 'package'.
(null: 6, 35): schema_reference.4: Failed to read schema document
'drools.org/drools-5.0.xsd', because 1) could not find the document; 2) the
document could not be read; 3) the root element of the document is not
<xsd:schema>.
...
Multiple of the example xml documents have been tried, but the error is
always the same. I tried to eliminate uneccessary whitespaces since that was
suggested in one of the previous topics about this issue, but so far to no
avail.
Right now i am using the very simple test_ParseGlobal:
<?xml version="1.0" encoding="UTF-8"?>
<package name="com.sample"
xmlns="http://drools.org/drools-5.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:schemaLocation="http://drools.org/drools-5.0 drools.org/drools-5.0.xsd">
<import name="java.util.HashMap"/>
<import name="org.drools.*"/>
<global identifier="x" type="com.sample.X"/>
<global identifier="yada" type="com.sample.Yada"/>
</package>
My code to do the transformation is:
PackageBuilderConfiguration conf = new PackageBuilderConfiguration();
XmlPackageReader reader = new XmlPackageReader(conf.getSemanticModules());
DrlDumper dumper = new DrlDumper();
FileReader filereader = new FileReader("test_ParseGlobal.xml");
PackageDescr descr = reader.read(filereader);
String test = dumper.dump(descr);
System.out.println(test);
FileWriter writer = new FileWriter(new File("test_ParseGlobal.drl"));
writer.write(dumper.dump(descr));
writer.flush();
writer.close();
Thank you for your help!
Best regards
Tobias
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15 years, 2 months
LHS Condition not able to achieve through Guvnor GUI.
by Harshit Bapna
Hello All,
I want to create below LHS condition in a Guvnor BRL rule.
(or
not (exists TransactionInfo())
TransactionInfo(action == null || action == "")
)
I am not able to achieve this though Guvnor.
After setting up an OR prefix, then the NOT option isn’t offered in the drop
down so this condition cannot be authored.
Is it possible ? any suggestions.
I want to avoid the two other approaches :
1. breaking this rule into two rules.
2. Writing a drl.
FYI, I did the testing with the DRL and now I am creating a BRL from the
DRL.
--Harshit
15 years, 2 months
CE "not" not working
by Piyush Goel
Hi,
We have a few rules like the ones given below.
rule "4"
salience 0
dialect "mvel"
when
av1 : AttributeValue( str == "Boys" )
exists InventoryAttribute( attribute == "DIVISION" && value == av1 )
av2 : AttributeValue( str == "Blazer" )
exists InventoryAttribute( attribute == "SUBCATEGORY" && value == av2 )
av3 : AttributeValue( str == "Boys Upper" )
not InventoryAttribute( attribute == "CATEGORY" && value == av3 )
then
VoucherSeries fact0 = new VoucherSeries();
fact0.setSeriesCode( "BUPPER1" );
fact0.setPriority(100);
fact0.setRuleName(drools.getRule().getName());
insert(fact0);
end
The CE "not" is never evaluating to true in the above rule. The "not" CE is
working only for very simple conditions like 'not AttributeValue( str ==
"Blazer")' .
Any idea what are we doing wrong ?
Regards,
piyush
15 years, 2 months
decision table problem Reg:
by Murali Venugopal
hi,
i'm facing a problem with decision tables. i've got a .drl working file.
but when i happen to take that into a .xls file ( decision table ) it
throws some errors.
my actual rule in .drl file has got something like this.
when
$event : RouteEvent( nodeIp == "192.168.1.12 )
$varbind : Varbind ( oid == ".1.3.6.1.2.1.2.2.1.1.0" && value ==
"5" ) from $event.varbindings
then
System.out.println("some text")
here in my decision table, my first cell would have the first condition
$event : RouteEvent
nodeIp == "$param"
that is, i've to omit my "(" and ")" braces.
so now, my second condition is
$varbind : Varbind
( oid == "$1" && value == "$2" ) from $event.varbindings
here i don't know how to omit the "(" and ")" braces. or should i add
and other layer of those braces.
anyway, the decision table is not working, where as my rule file does.
the error message is
error java.lang.RuntimeException: [10,55]: [ERR 102] Line 10:55
mismatched input 'FROM' expecting ')' in rule "210.210.122.100 GroupA"
in pattern Varbind[10,77]: [ERR 102] Line 10:77 mismatched input ')'
expecting 'then' in rule "210.210.122.100 GroupA"
my doubt is,
in the first case all my condition expression is contained with in
braces. where as in second case, it's not. so how do i've to handle
this. do i've have to omit the braces in the second case or not.
please help me. i've been struggling to solve this error. also, i
couldn't find references in the documentation.
thanks in advace.
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15 years, 2 months
Drools 5.1 JMX Monitoring.
by Benson Fung
Hi ,
As I understand, Drools 5.1 made API enhancement to support JMX standard and
enables knowledge base and knowledge session monitoring and inspection using
any JMX console.
It also can display the average firing time. How to implement this? Is
there any sample for this? Please advise.
Thanks
15 years, 2 months
how do I add not exists contraint in dslr
by maverik j
Hi,
I have been trying to add not exists constraint in dslr but its failing to
parse the dslr. Here is what I am trying to do in DSLR
[when][][*Tt*]here is at least one {entity}= not(exists {entity}:
{entity}())
If I simply use the exists constraint here then it works well. But then
after adding not to it, its not getting parsed correctly.
error I am geeting is:
[10,27]: [ERR 102] Line 10:27 mismatched input ',' expecting ')' in rule
"Rule1" in pattern Person
not sure whats going wrong here, if it is expected to work this way?
thanks,
-m
15 years, 2 months
Incorrect output for double values on German Window
by nagarajt
I have a drl file with contents
Sample.drl
------------------
package DecisionTable;
import bre.Number;
rule "DecisionTable #1: (Number.number <'4.3')"
salience 0
when
number:Number(
number< 4.3)
then
number.setText(number.getNumber().toString()+" < 4.3");
end
rule "DecisionTable #2: (Number.number >'10.0')"
salience 0
when
number:Number(
number> 10.0)
then
number.setText(number.getNumber().toString()+" > 10.0");
end
rule "DecisionTable #3: (Number.number 'between 4.3 and 10.0')"
salience 0
when
number:Number(
number>=4.3 ,
number<=10.0)
then
number.setText(number.getNumber().toString()+" is between 4.3 and 10.0");
end
Number.java
-------------------
package bre;
public class Number {
public Double number;
public Double getNumber() {
return number;
}
public void setNumber(Double number) {
this.number = number;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public String text;
}
If I use Windows XP ( Regional Language settings in Control Panel to
English(United States)) rules are firing correctly
Input Output
4.6 4.6 between 4.3 and 10.0
3.3 3.3 < 4.3
7.5 7.5 between 4.3 and 10.0
11.2 11.2 > 10.0
But If use German Windows XP (Regional Language settings in Control Panel to
German(Germany) rules are not firing correctly
Input Output
4.6 4.6 < 4.3
3.3 3.3 < 4.3
7.5 7.5 < 4.3
11.2 11.2 < 4.3
I am using Drools 5.0.1 version. Any specific configuration settings
required for German Windows XP to get correct output?
Please reply back. it is urgent.
Thanks in advance
Nagaraj
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15 years, 2 months
Drools Content Based Routing with Camel (John Ellis)
by Mark Proctor
http://blog.athico.com/2011/01/drools-content-based-routing-with-camel.html
Drools Content Based Routing with Camel (John Ellis)
<http://blog.athico.com/2011/01/drools-content-based-routing-with-camel.html>
John Ellis has done a nice writeup of his work on improving Drools to
work with Camel for CBR. You'll need to use the latest version of Drools
from trunk, which can be found in the maven repository that's
5.2.0-SNAPSHOT,
https://repository.jboss.org/nexus/content/groups/public/org/drools/.
For bonus points I'd love to see a further Drools and Camel tutorial
around OSGi's EventAdmin, http://camel.apache.org/eventadmin.html <http://>.
One of Camel's greatest strengths is the explicit support for Enterprise
Integration Patterns <http://www.eaipatterns.com/toc.html>. Drools
itself is particularly well suited to work alongside Camel to implement
two commonly used integration patterns: the Content Based Router and the
Dynamic Router. Both patterns leverage the ability of a Drools Endpoint
to rapidly evaluate properties of a message, while the Dynamic Router
can also integrate the Drools Policy as a dynamic rule based on feedback
from a control channel.
The Camel routes required for message routing do not differ much from
the previous Drools Endpoint example. You may even be able to omit the
Drools Policy if you wish to inspect only the headers of messages being
routed instead of interrogating the body of each message. For example, a
DRL could be defined that takes action on inbound messages such as:
import org.apache.camel.Message;
rule "WriteOperations"
when
$message : Message(headers["OPERATION"] == "WRITE");
then
$message.setHeader("routingSlip", "activemq:queue:op.write");
end
rule "ReadOperations"
when
$message : Message(headers["OPERATION"] == "READ");
then
$message.setHeader("routingSlip", "activemq:queue:op.read");
end
Example 1: DRL for Routing Based on Message Headers
Here the custom header "OPERATION" is evaluated to see if it is set to
the value "WRITE" or "READ." Depending on the value of this header, a
routing slip is defined for the message. The Routing Slip is another
Enterprise Integration Pattern supported by Camel that may contain one
or more URIs. The message is then sequentially sent to each URI defined.
The Camel routing itself is simply defined as:
<route>
<from uri="activemq:queue:router"/>
<to uri="drools:brokerNode/cbrKSession?action=insertMessage"/>
<routingSlip uriDelimiter="#">
<header>routingSlip</header>
</routingSlip>
</route>
Example 2: Camel Routes for Content Based Routing
Here we explicitly inform Camel that routing slips are defined as values
within the "routingSlip" header and each URI is delimited by a #
character. The headers set within the DRL are then interpreted as each
message exits the Drools endpoint.
Content based routing with a Drools Endpoint offers several advantages
over Camel's default implementation. The DRL format itself allows
routing to be specified more succinctly than Sprint DSLs or Camel
RouteBuilders. Conditional operations are also evaluated more
efficiently within Drools and are thread-safe, allowing a high volume of
messages to be routed concurrently.
15 years, 2 months
