Eclipse Bug?
by malkhafaji
Hello,
I just want to report something that I have seen, and I am not sure whether
others see the same thing or not. I am using the latest binaries from TRUNK
as well as drools library for Eclipse. I found out that if you comment a
bunch of rules using /* through the end of the rules file (drl) but forgot
to add a matching */ the rule does not complain on Eclipse no matter how
many times I refresh, clean the project or restart eclipse. However, it
correctly complains when I compile the run via the API that there is a
"mismatch ''" and it points me to the last line of the file where the
matching */ should have been. It does not give you an informative message,
that is why I was puzzled for a while why it was pointing me to an empty
line at the end of the drl file although Eclipse did not show any errors in
the rules file. But then I noticed the color difference of how the rules are
displayed and I knew that there was a beginning comment symbol somewhere.
I just wanted to report this if people are having the same issue.
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16 years, 4 months
Drools 5.0 - can't make it use Janino compiler - always wants eclipse jar
by Martin Smith
Hi folks,
I'm doing some very basic evaluation of Drools and can't get past the
first hurdle - the hello world example. I get this:
......
Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not
in the classpath
at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:94)
at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55)
at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270)
I'm not using Eclipse, my IDE is netbeans 6.8. I get the same error
running the compiled jar from outside netbeans as well so I don't
think it's related to the IDE.
I modified the example by adding a knowledge builder config and then this:
kconfig.setProperty("drools.dialect.java.compiler", "JANINO");
This had no effect. I rewrote the example to use a package builder and
set the compiler property on it to JANINO. Again, it didn't work. I
also tried passing a -Dproperty with the same thing. Again, no effect.
I have the janino jar from the download on the classpath along with
the other jars it says are necessary.
It works if I download and add the eclipse jar to the classpath but I
don't want to do this as I don't want my runtime app to depend on
pieces of eclipse.
I'm out of time and ideas now so asking for help here. These are the
drools related jars I have in the project:
antlr-runtime-3.1.1.jar
drools-api-5.0.1.jar
drools-compiler-5.0.1.jar
drools-core-5.0.1.jar
joda-time-1.6.jar
mvel2-2.0.10.jar
janino-2.5.15.jar
xstream-1.3.1.jar
Thanks,
Martin
16 years, 4 months
Re: [rules-users] Fact Execution Order
by Nawrocki, Dan (IS)
I want to control the order of firing for facts that match a single
rule. I'm using Drools 5.0.1. Is there any way to do this?
My problem can be boiled down as follows. I have an array structure
that I want to conditionally copy to a new array structure. I would
like to order of the destination array to match the source array. The
code to insert facts into working memory increments in ascending order.
It is equivalent to:
for( Object o : sourceArray )
ksess.insert( convertToMyFact( o ) );
I have constructed my rules as such:
rule "rule1"
when
$f : MyFact( prop == "testVal" )
then
copyToDestination( $f.prop, $f.index );
end
After running, however, the destination array appears in reverse order:
source[0] == destination[5]
source[1] == destination[4]
source[2] == destination[3]
source[3] == destination[2]
source[4] == destination[1]
source[5] == destination[0]
Which seems to make sense if the facts are evaluated as if they were
popped off a stack. Is there any way to force Drools to use a list
instead? Or should I just insert facts in reverse order?
I would like the order:
source[0] == destination[0]
source[1] == destination[1]
etc.
Thanks,
Dan
16 years, 4 months
Error: unable to resolve method
by xalperte
I'm having a problem a little odd trying to fire rules using the Guvnor.
In Guvnor I have a package named package kobo.regularSafaris, inside this
package I have defined rules (with some DSL definitions), a decision table
(xls) and two functions.
The problem is that when I'm trying to call the functions in the consequence
of a rule I'm having the following error:
org.drools.runtime.rule.ConsequenceException: [Error: unable to resolve
method:
kobo.regularSafaris.AddBookingPayment.addBookingPayment(kobo.regularSafaris.BookingRequest,
java.lang.Integer, java.lang.Integer) [arglength=3]]
[Near : {... Unknown ....}]
^
[Line: 1, Column: 0]
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1086)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:660)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:632)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:187)
at
com.rudder.packages.test.rules.PricesRulesTestCase.testNobelLowSeasonPrices(PricesRulesTestCase.java:108)
The function definition is as follows:
function void addBookingPayment(BookingRequest request, int days, int
percentage) {
PaymentPolicy payment = new PaymentPolicy();
payment.setPercentage(percentage);
if( days > 0 ) {
DateMidnight dueDate = new
DateMidnight(request.getDepartureDate().getTime()).minusDays(days);
payment.setType("DEFERRED");
payment.setDueDate(dueDate.toDate());
} else {
payment.setType("NOW");
payment.setDueDate(null);
}
List payments = request.getBookingData().getPayments();
if(payments == null) {
payments = new ArrayList();
request.getBookingData().setPayments(payments);
}
payments.add(payment);
}
And the rule that is calling the function is the following:
rule "Def. Deferred Payment for Credit Operator"
dialect "mvel"
when
$request: BookingRequest()
user: User(type == "Professional") from $request.user
eval($request.getBookingData().getPayments() == null) || ArrayList(size ==
0) from $request.bookingData.payments
eval( "true".equals($request.getUser().getTags().get("hasCredit")))
eval( (new
DateMidnight($request.getDepartureDate().getTime())).minusDays(35).toDate().after(new
Date()))
then
addBookingPayment($request, 35, 100);
end
It seems that the system is adding an extra "AddBookingPayment" to the
package name and this is causing the problem. Why is doing that? how can i
solve this?
Thanks in advance
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16 years, 4 months
Re: [rules-users] Nesting rules in Drools 5.x
by Greg Barton
I think this is fixed in trunk.
GreG
On Jan 3, 2010, at 0:56, orchid <maya.pollack(a)gmail.com> wrote:
Hi All,
I'm trying to nest the LHS of rules in the following way:
rule "Rule_stilton"
when
$c : Cheese (type == "stilton")
then
$c.addRuleToList( "Rule_stilton" );
System.out.println("Rule_stilton was fired");
end
rule "Rule_price" extends "Rule_stilton"
when
Cheese(price <= 6.00) from $c
then
$c.addRuleToList( "Rule_price" );
System.out.println("Rule_price was fired");
End
The class Cheese contains a list field of matching rules of that instance
and a public function 'addRuleToList', which adds the rule name into that
list.
I get build error: "Unable to find declaration in list while generating the
consequence invoker". Is there some other way to reach that?
Thanks in advance.
Any help will be appreciated.
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16 years, 4 months
How to check an array field from LHS of a rule
by orchid
Hi All,
I'm using Drools 5.x. I have the following class:
public class Machine{
...
private List rules = new ArrayList();
...
}
The 'rules' list holds strings. I would like from my rule to check whether
that list contains the string "rule2".
I've tried doing this in the following ways, but get compilation error:
rule "rule1"
when
/*1st attempt:*/ $m:Machine(rules contains "rule2")
/*2nd attempt:*/ $m:Machine(rules.contains("rule2") )
then
...
What am I doing wrong?
Thanks in advance !!!
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16 years, 4 months
Nesting rules in Drools 5.x
by orchid
Hi All,
I'm trying to nest the LHS of rules in the following way:
rule "Rule_stilton"
when
$c : Cheese (type == "stilton")
then
$c.addRuleToList( "Rule_stilton" );
System.out.println("Rule_stilton was fired");
end
rule "Rule_price" extends "Rule_stilton"
when
Cheese(price <= 6.00) from $c
then
$c.addRuleToList( "Rule_price" );
System.out.println("Rule_price was fired");
End
The class Cheese contains a list field of matching rules of that instance
and a public function 'addRuleToList', which adds the rule name into that
list.
I get build error: "Unable to find declaration in list while generating the
consequence invoker". Is there some other way to reach that?
Thanks in advance.
Any help will be appreciated.
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16 years, 4 months
Quantification of possible planner/solver solutions
by Pete Carapetyan
Geoffrey:
It is a source of fascination to me that you were able to come up with
a number for how many possible planner combinations there were for
each planner/solver example.
For example, where this kind of calculation comes from or how to derive my own ?
Example from Drools Solver Manual:
Set # students # exams/topics # periods # rooms #
possible solutions
exam_comp_set1 7883 607 54 7
1.11000574474221096210367623e+1052
16 years, 4 months
