Inquiring about Online Drools Training quality ...
by profversaggi
I'm curious about the experiences anyone has had investing in the online
training offerings for Drools. I've seen a lot of offerings coming from many
different directions, with equally disparate price tags, and originating
from different places on the globe. This immediately brings up a question of
quality.
I'm one who would rather forage my way through the 3 recommended books, and
the online docs, free tutorials, etc to get a solid foundation before
embarking on anything more, but I do appreciate opportunities to shorten up
the learning curve if it's good quality stuff.
I'm soliciting opinions please, your thoughts?
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12 years
Compiling drools-examples
by baloodevil
Newbie question. I've imported drools-examples project into Eclipse (Kepler)
(which has GEF installed). I resolved build path errors by creating folders
src/test/java and src/test/resources. I resolved another issue by adding an
External JAR of org.eclipse.jdt.core_3.10.0.v20131029-1755.jar to the
project. (Those two changes allow me to create a new Drools Hello World
project and execute, however no such luck with complete examples) There are
hundreds of Drools Errors and hundreds of Java Problems, which I assume can
only be because of setup issues. The first Drools error is
"ArrayList is a raw type. References to generic type ArrayList<E> should be
parameterized AdventureFrame.java
/drools-examples/src/main/java/org/drools/games/adventures". That file
shows an import problem with
"import net.miginfocom.layout.ConstraintParser;" and "import
net.miginfocom.swing.MigLayout;". Those are referenced in the pom.xml file
in...
<dependency>
<groupId>com.miglayout</groupId>
<artifactId>miglayout</artifactId>
<version>3.7.4</version>
</dependency>
I don't know where to go next. Complete Drools newbie, and also fumbling
around with Eclipse.
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12 years, 1 month
Optaplanner: Unexpected global [scoreHolder]
by jonathan.labin
I am using Optaplanner 6.0.0-Beta2 and I am in some cases receiving the
following error during initial solution construction:
Exception in thread "main" java.lang.RuntimeException: Unexpected global
[scoreHolder]
at
org.drools.core.common.AbstractWorkingMemory.setGlobal(AbstractWorkingMemory.java:515)
at
org.drools.core.impl.StatefulKnowledgeSessionImpl.setGlobal(StatefulKnowledgeSessionImpl.java:360)
at
org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.resetKieSession(DroolsScoreDirector.java:83)
at
org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.setWorkingSolution(DroolsScoreDirector.java:74)
at
org.optaplanner.core.impl.solver.scope.DefaultSolverScope.setWorkingSolutionFromBestSolution(DefaultSolverScope.java:176)
at
org.optaplanner.core.impl.solver.DefaultSolver.solvingStarted(DefaultSolver.java:176)
at
org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:154)
I noticed this error in gist:
https://gist.github.com/ge0ffrey/5236604
If this is the same error, what are the current constraints that I need
adhere to in order to avoid this error?
Jon
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12 years, 1 month
using Drools in Tomcat 6.0 enviourment
by Erez Zarini
Hi,
I am new to Drools.
I have successfully created a project from the Examples provided at the site
using Java APP project.
but when trying to move it as a Dynamic Web Project in Eclipse I get the
following Exception:
(the files kmodule and pom.xml resides in all subfolders of the project)
21/11/2013 15:49:42 org.drools.compiler.kie.builder.impl.ClasspathKieProject
discoverKieModules
INFO: Found kmodule:
file:/C:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/DecisionTableGvia/WEB-INF/classes/META-INF/kmodule.xml
21/11/2013 15:49:43 org.drools.compiler.kie.builder.impl.ClasspathKieProject
getPomProperties
WARNING: Unable to load pom.properties tried recursing down
from/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/DecisionTableGvia/WEB-INF/classes
null
21/11/2013 15:49:43 org.drools.compiler.kie.builder.impl.ClasspathKieProject
discoverKieModules
SEVERE: Unable to build index of kmodule.xml
url=file:/C:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/DecisionTableGvia/WEB-INF/classes/META-INF/kmodule.xml
null
[]
21/11/2013 15:49:43 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet getDecisionGvia threw exception
java.lang.NullPointerException
at
org.drools.compiler.kie.builder.impl.KieContainerImpl.newStatelessKieSession(KieContainerImpl.java:360)
at
org.drools.compiler.kie.builder.impl.KieContainerImpl.newStatelessKieSession(KieContainerImpl.java:351)
at
gvia.PricingRuleDTExample.executeExample(PricingRuleDTExample.java:39)
at gvia.PricingRuleDTExample.main(PricingRuleDTExample.java:32)
at gvia.getDecisionGvia.doGet(getDecisionGvia.java:33)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)
when running as a Java project (not Java EE) it seems to work find and
continues to find pom.xml instead of pom.properties.
any ideas?
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12 years, 1 month
Optaplanner rules NullPointerException
by ns
Hi,
I am trying to accomplish the following, a part time employee (eg 50%) needs
to do only half the shifts a full time employee needs to do. I have created
a rule, that
1. count number of shifts of certain shiftType
2. count number of shifts of a certain shiftType per employee
3. count the total number of "arbeidsbreuken" per employee and within a
certain shiftType
4. do something with these numbers so that an part time employee only gets
half the shifts assigned that a full time employee gets
The complete rule is:
rule "arbeidsbreuk"
when
//System.out.println("arbeidsbreuk, Drools!");
ShiftAssignment($employee : employee, $shiftType : shiftType)
//count aantal shifts
$assignmentTotal : Number() from accumulate(
$assignment : ShiftAssignment(shiftType == $shiftType),
count($assignment)
)
//count aantal shifts per medewerker
$assignmentTotalEmployee : Number() from accumulate(
$assignmentEmployee : ShiftAssignment(employee == $employee,
shiftType == $shiftType),
count($assignmentEmployee)
)
//count arbeidsbreuken van alle medewerkers
$arbeidsbreukTotal : Number() from accumulate(
//Employee($breuk : arbeidsbreuk),
ShiftAssignment(employee == $employee, shiftType == $shiftType),
sum($employee.getArbeidsbreuk())
)
$assignmentTotalEmployee.intValue())
then
System.out.println("Arbeidsbreuk drools: " +
$employee.getArbeidsbreuk() + " - " + $assignmentTotal.intValue() + " - " +
$assignmentTotalEmployee.intValue() + " - " + $arbeidsbreukTotal);
scoreHolder.addSoftConstraintMatch(kcontext,
-(Math.abs(($employee.getArbeidsbreuk() * $assignmentTotal.intValue()) -
$assignmentTotalEmployee.intValue()) *
(Math.abs(($employee.getArbeidsbreuk() * $assignmentTotal.intValue()) -
$assignmentTotalEmployee.intValue()))) );
end
I get the following error:
Exception in thread "main" org.drools.core.RuntimeDroolsException:
java.lang.NullPointerException
at org.drools.core.rule.Accumulate.accumulate(Accumulate.java:182)
at
org.drools.core.phreak.PhreakAccumulateNode.addMatch(PhreakAccumulateNode.java:756)
at
org.drools.core.phreak.PhreakAccumulateNode.doLeftInserts(PhreakAccumulateNode.java:164)
at
org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:81)
at
org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:524)
at
org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:494)
at
org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:277)
at
org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161)
at
org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116)
at
org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:205)
at
org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:65)
at
org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:936)
at
org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1183)
at
org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:935)
at
org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:909)
at
org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:233)
at
org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:98)
at
org.optaplanner.core.impl.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:101)
at
org.optaplanner.core.impl.bestsolution.BestSolutionRecaller.solvingStarted(BestSolutionRecaller.java:58)
at
org.optaplanner.core.impl.solver.DefaultSolver.solvingStarted(DefaultSolver.java:177)
at
org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:154)
at be.ocmwturnhout.permanenties.Main.main(Main.java:495)
Caused by: java.lang.NullPointerException
at
be.ocmwturnhout.permanenties.solver.Rule_arbeidsbreuk654888368.accumulateExpression2(Rule_arbeidsbreuk654888368.java:23)
at
be.ocmwturnhout.permanenties.solver.Rule_arbeidsbreuk654888368AccumulateExpression2Invoker.evaluate(Rule_arbeidsbreuk654888368AccumulateExpression2Invoker.java:25)
at
org.drools.core.base.accumulators.JavaAccumulatorFunctionExecutor.accumulate(JavaAccumulatorFunctionExecutor.java:107)
at org.drools.core.rule.Accumulate.accumulate(Accumulate.java:173)
... 21 more
Any idea how I can solve this? Thanks.
Kind regards,
Nick
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12 years, 1 month
How to deal with doubles in Optaplanner drools rules
by ns
Hi,
I am having trouble dealing with doubles in the Optaplanner drools rule drl
file. See error message below.
Exception in thread "main" java.lang.IllegalStateException: There are errors
in the scoreDrl's:
Error Messages:
Message [id=1, level=ERROR,
path=optaplanner-kie-namespace//be/ocmwturnhout/permanenties/solver/permanentiesScoreRules.drl,
line=96, column=0
text=Rule Compilation error The method
addSoftConstraintMatch(RuleContext, int) in the type HardSoftScoreHolder is
not applicable for the arguments (RuleContext, double)]
I have the following then rule part:
scoreHolder.addSoftConstraintMatch(kcontext, -(10 *
Math.abs(($employee.getArbeidsbreuk() * $assignmentTotal.intValue()) -
$assignmentTotalEmployee.intValue())) * (10 *
Math.abs(($employee.getArbeidsbreuk().intValue() *
$assignmentTotal.intValue()) - $assignmentTotalEmployee.intValue())) );
$employee.getArbeidsbreuk() is a double.
Aren't doubles allowed or can I convert it? Thanks.
Kind regards,
Ncik
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12 years, 1 month
Optaplanner order schedule performance problem
by Mohr, Michael
Hi,
I must find start and end times for orders on different equipment's in requirement of a stock.
What can I do better to get faster a solution.
I read the forum entries but it don't helps.
- Scheduling events with varying durations - corrupted score
- Time Slots vs Time Periods
Graphics and detail description in the pdf.
Domain model
@PlanningEntity
EquipmentAllocation has a Equipment
EquipmentAllocation has a Order
EquipmentAllocation has a TimeSlot
------------------------------------------------------
@PlanningVariable
Order
Attribute: quantity
------------------------------------------------------
TimeSlot
Attribute: startTime, endTime, duration, sequenceNumber
------------------------------------------------------
Material
Attribute: stock, minStock, maxStock
------------------------------------------------------
Material Demand has a TimeSlot
Attribute: quantity
------------------------------------------------------
Conditions:
- Order is executable on each equipment.
- Orders has different sizes.
- Order running time is depending of the material and the equipment.
- Gaps between orders are possible if there is no demand.
- Gaps between orders are possible when there is a equipment setup time.
- Parallel orders with same material on different equipment's are possible.
Target:
- Calculate start and endtims for an order.
- Start and endtime is precisely one minute (maximum five minutes if runtime is to long).
- Satisfy only the demand of a material.
- Good result in 5 minutes.
- No exceed min or max stock.
Plan data:
- Plan for 24 hours.
- Plan 35 orders (normal order time is 2 hours).
- Plan 5 demands with different materials (7 orders per demand).
- Plan 3 equipment's.
Problem:
- No result in 5 minutes.
- Concept with timeslots has to many possible order positions.
- No restrictions are possible to find the best solution.
Use a pillar swap to create the possible order positions on each equipment.
Use a pillar swap to lay the order over a lot of timeslots on a equipment.
Example:
- 1 order (with 2 hours)
- 1 equipment
- 24 hours planning time with 1 timeslot per minute
- Possible order positions = 22 * 60 = 1320 (on one equipment)
- Possible order positions = 1320 * 3 = 3960 (on three equipment)
- Possible order positions = 3960 * 35 = 138.600 (all orders on all equipment)
rule "Check order not allocate to less."
when
$f : Order( $quantity : quantity , $m : material )
$result : Number( (intValue > 0) && ( intValue < $quantity ) )
from accumulate(
EquipmentAllocation( order != null && order == $f , $sp : equipment.speedMap ),
sum($sp.get($m))
)
then
int hard = $result.intValue() - $quantity;
scoreHolder.addHardConstraintMatch(kcontext, hard );
end
rule "Check order not allocate to many."
when
$f : Order( $quantity : quantity , $m : material )
$result : Number( (intValue > 0) && ( intValue > $quantity ) )
from accumulate(
EquipmentAllocation(order != null && order == $f , $map : equipment.orderMap )
sum( $map.get( $f ))
)
then
int hard = $quantity - $result.intValue();
scoreHolder.addHardConstraintMatch(kcontext, hard );
end
rule "Check demand"
when
$m : Material( $stock : stock )
$t : TimeSlot( $sequence : sequence )
$sumDemand : Number( )
from accumulate (
Demand ( timeSlot.sequence <= $sequence , material == $m , $quantity : quantity )
sum( $quantity )
)
$sumAllocation : Number( ($stock + intValue - $sumDemand.intValue()) < 0 )
from accumulate (
EquipmentAllocation( (order != null && order.material == $m) , timeSlot.sequence <= $sequence , $sp : equipment.speedMap),
sum( $sp.get($m) )
)
then
scoreHolder.addHardConstraintMatch(kcontext, -1);
end
rule "Check min stock"
when
$m : Material( $stock : stock , $minStock : minStock, $maxStock : maxStock )
$t : TimeSlot( $sequenceT : sequence )
$sumDemand : Number( )
from accumulate (
Demand ( timeSlot.sequence <= $sequenceT , material == $m , $quantityDemand : quantity )
sum( $quantityDemand )
)
$sumAllocation : Number( ($stock + (intValue) - $sumDemand.intValue()) < $minStock )
from accumulate (
EquipmentAllocation( order != null , order.material == $m , timeSlot.sequence <= $sequenceT , $sp : equipment.speedMap ),
sum( $sp.get($m) )
)
then
scoreHolder.addHardConstraintMatch(kcontext, -1);
end
rule "Check max stock"
when
$t : TimeSlot( $sequence : sequence )
$m : Material( $stock : stock , $maxStock : maxStock )
$sumDemand : Number( )
from accumulate (
Demand ( timeSlot.sequence <= $sequence , material == $m, $quantityDemand : quantity)
sum( $quantityDemand )
)
$sumAllocation : Number( ($stock + intValue - $sumDemand.intValue()) > $maxStock )
from accumulate (
EquipmentAllocation( (order != null && order.material == $m) , timeSlot.sequence <= $sequence , $sp : equipment.speedMap ),
sum( $sp.get($m) )
)
then
scoreHolder.addHardConstraintMatch(kcontext, -1);
end
Gruß
Michael Mohr
Software Engineer
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12 years, 1 month
