Drools 5.2 -> 5.5 problems
by darktyco
Hey everyone,
I have been running Drools 5.2 for a long time now and decided to try out
Drools 5.5 to see what was new. I felt that 5.2 was always a bit of a memory
hog so I was hoping that 5.5 would be better, however it seems to have
gotten worse. Previously I could run my company's test suite with -Xmx1024m
-XX:MaxPermSize=256m. Now I get:
[Error: Java heap space]
[Near : {... MyDomainObject != CE ....}]
^
[Line: 1, Column: 1]
at
org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:308)
at
org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)
at org.mvel2.MVEL.compileExpression(MVEL.java:810)
at
org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435)
at
org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)
at
org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)
at
org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)
at
org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:141)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
at
my.company.KnowledgeBaseStatelessRuleEngine.execute(KnowledgeBaseStatelessRuleEngine.java:48)
I incrementally increased the max heap size in steps of 500m to see when the
heap error would go away and I had to go all the way up to 4000m. Is it
common knowledge that Drools requires more memory since 5.5? Is there
anything our rules could possibly be doing wrong that the newer versions
don't like?
Once I do get the tests running, I am getting a lot of errors about a
comparison to a string with the value of "null":
Exception executing consequence for rule "SomeRule_39" in
my.company.user.rules: [Error: incompatible types in statement: class
java.lang.String (compared from: class
my.company.userdata.intermediate.numbers.TotalScore)]
[Near : {... this != "null" ....}]
^
[Line: 1, Column: 1]
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at
my.company.commons.rules.util.KnowledgeBaseStatelessRuleEngine.execute(KnowledgeBaseStatelessRuleEngine.java:49)
Caused by: [Error: incompatible types in statement: class java.lang.String
(compared from: class my.company.userdata.intermediate.numbers.TotalScore)]
[Near : {... this != "null" ....}]
^
[Line: 1, Column: 1]
at org.mvel2.ast.BinaryOperation.<init>(BinaryOperation.java:84)
at org.mvel2.util.CompilerTools.finalizePayload(CompilerTools.java:118)
at
org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:287)
at
org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)
at org.mvel2.MVEL.compileExpression(MVEL.java:810)
at
org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435)
at
org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)
at
org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)
at
org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)
at
org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:192)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:186)
at
my.company.user.rules.Rule_SomeRule_39_e811b8e64e174d6b84ff672feb3172d2.defaultConsequence(Rule_SomeRule_39_e811b8e64e174d6b84ff672feb3172d2.java:8)
at
my.company.user.rules.Rule_SomeRule_39_e811b8e64e174d6b84ff672feb3172d2DefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
at
my.company.user.rules.Rule_SomeRule_39_e811b8e64e174d6b84ff672feb3172d2DefaultConsequenceInvoker.evaluate(Unknown
Source)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)
... 37 more
I have checked my DRL sources and verified that I am not doing any null
checks, and I am certainly not doing any "null" checks either. Does anyone
out there happen to know why this error is occuring? The source for that
rule is:
rule "SomeRule_39"
when
subScore1 : SubScore1()
subScore2 : SubScore2()
subScore3 : SubScore3()
subScore4 : SubScore4()
subScore5 : SubScore5()
subScore6 : SubScore6()
subScore7 : SubScore7()
subScore8 : SubScore8()
subScore9 : SubScore9()
subScore10 : SubScore10()
then
TotalScore totalScore = new TotalScore(subScore1.getValue() +
subScore2.getValue() + subScore3.getValue() + subScore4.getValue() +
subScore5.getValue() + subScore6.getValue() + subScore7.getValue() +
subScore8.getValue() + subScore9.getValue() + subScore10.getValue());
insert(totalScore);
end
Thanks for any insight!
-DT
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13 years, 1 month
Re: [rules-users] To group some objects by type
by mdzaebel
Mister Nono wrote
> ... only the last car is in the TreeMap
Thats why I said "/you need Lists or Maps as values of the TreeMap/".
*Here is fast solution:*
import Vehicle
import java.util.*
rule "Print grouped vehicles"
when $map : Map() from accumulate ($v : Vehicle($w : wheels),
init(TreeMap map=new TreeMap()),
action( if(map.containsKey($w)) ((List)map.get($w)).add($v);
else map.put($w, new ArrayList(Arrays.asList($v)));),
result(map))
then System.out.println($map);
end
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13 years, 1 month
Find out order of insert in RHS
by Sandjaja, Dominik
Hi everybody,
short: is there a way to have an automatic counter for the RHS of a rule when inserting several objects in one rule?
Long:
I use drools with a DSL to insert items for a frontend dropdown box. The generated rule is e.g. like the following one:
rule "testRule_H"
dialect "mvel"
when
SomePartOfMyModel( someField == "H" )
then
DropDownItem fact1 = new DropDownItem(); fact1.setLabel( "My Label 1" ); fact1.setValue( "B" );
insert (fact1);
DropDownItem fact1 = new DropDownItem(); fact1.setLabel( "My Label 2" ); fact1.setValue( "A" );
insert (fact1);
This works nicely and I get all the items. The problem I have is with the sorting. Users use Guvnor to edit the available items for the dropdown box, so they add and remove items from the RHS. Since I retrieve those objects from the knowledge base in my java code like this:
Collection<FactHandle> handles = statefulKnowledgeSession.getFactHandles(new ClassObjectFilter(DropDownItem.class));
for (FactHandle handle : handles) {
DropDownItem selectItem = (DropDownItem) statefulKnowledgeSession.getObject(handle);
...
I think I cannot be sure about the order the objects are retrieved (it's a collection, no guaranteed sorting!). So, I sort the DropDownItems alphabetically by their value.
My question now is, as stated above: How can I implement a counter which I can use in the facts being inserted to keep my inserted facts (DropDownItems) in the same order as they are inserted?
Thanks in advance
Dominik
…………………………………………………………………
mit freundlichen Grüßen / kind regards
Dominik Sandjaja
Fon: +49 (0) 203 60878 183
Fax: +49 (0) 203 60878 222
e-mail: dominik.sandjaja(a)it-motive.de
it-motive AG
Zum Walkmüller 10-12
47269 Duisburg
info(a)it-motive.de
http://www.it-motive.de
……………………………………………………………………
Vorsitzender des Aufsichtsrats: Dipl.-Ing. Klaus Straub
Vorstand: Horst-Dieter Deelmann (Vors.), Matthias Heming, Christoph Tim Klose
HRB 9207, Amtsgericht Duisburg
13 years, 1 month
Question on Model in Guvnor
by IPatel
I have 2 sets of model created in Guvnor: Model1 and Model2.
In Model1: I have LoanApplication and Amount Facts each containing some
variables. I imported this via Jar from Java
In Model2: I have Person and BankAccount Facts each containing some
variables. I created this facts using Guvnor and Added Fields to it.
I have a simple rule
rule "Approve the appliocation for a Person whoes Age is ngreather than 18"
dialect "mvel"
when
Person ( age > 18)
then
LoanApplication fact3 = new LoanApplication( );
fact3.setApproved(true);
insert( fact3 );
end
I am testing this rule using "New Test Scenario" option on Guvnor. Test case
does not pass even though i have valid input. Is this happening because i
have one fact created in Model1 and another fact created in Model2?
Thank you
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13 years, 1 month
ambition = ThreadPoolExecutor delegating to KBPool(s) & KSPools(s)
by Cotton, Ben
Let's say that a start-of-day, every day, we generate a giant 2,000+ rule .DRL, that we then use to construct into a single run-time KnowledgeBase reference. We then construct a single run-time KnowledgeSession reference (also at start of day). Throughout the day, all day, facts "arrive" asynchronously into our expert system. When a fact "arrives", we synchronously place the fact onto our single KS and call .fireAllRules(), which in turn synchronously outputs answers that satisfy our "what's the next step?" decision requirements.
We have this working very well, but we have the ambition to achieve more.
We want to attempt to scale this solution to accommodate the high-frequency simultaneous "arrival" of many facts. We have at our disposal a 24xCPU 128 gb Linux-based compute resource (nice, right?) ... so, ideally, we have the ambition to potentially accommodate the simultaneous arrival of 24 facts into our expert system.
Assuming that all of our 2,000+ rules are completely isolated (i.e. no rule i ever depends on any rule j, for all i,j) we want to consider building (at start of day) a KSPool (size 24) , KBPool (size 24), and a ThreadPoolExecutor (size 24, backed by BlockingQueue). As facts arrive throughout the day, those that arrive simultaneously are Queue'd to the TPE, that then delegates the fact's need for service to a task Runnable, which in turn calls a KSPool[i].fireAllRules() (with isolation to KBPool[i]). In such a scheme, we would potentially be able to render decisions concurrently when facts arrive simultaneously ( capacity 24).
Is this design ambition common w/in current DROOLs use cases? Does the current (or future) DROOLS offering include any in-place capability to Pool KS or Pool KB? If not, are there any potential DROOLs concerns or "gotchas" wrt to our pursuing this ambition (in a "let's build this now!" prototype)?
As always, tremendous thanks to all in this community forum.
Ben D Cotton III
Morgan Stanley & Co.
OTC Derivatives Clearing Technology
1221 AOTA Rockefeller Ctr - Flr 27
New York, NY 10020
(212)762.9094
ben.cotton(a)ms.com<mailto:ben.cotton@ms.com>
________________________________
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13 years, 1 month
Can someone help me understand a java rule?
by Aijin Nakanishi
I'm trying to understand when is proccess assigned to a computer by that
java example.
----------------
public HardAndSoftScore calculateScore(CloudBalance cloudBalance) {
int hardScore = 0;
int softScore = 0;
for (CloudComputer computer : cloudBalance.getComputerList()) {
int cpuPowerUsage = 0;
int memoryUsage = 0;
int networkBandwidthUsage = 0;
boolean used = false;
// Calculate usage
for (CloudProcess process : cloudBalance.getProcessList()) {
if (computer.equals(process.getComputer())) {
cpuPowerUsage += process.getRequiredCpuPower();
memoryUsage += process.getRequiredMemory();
networkBandwidthUsage +=
process.getRequiredNetworkBandwidth();
used = true;
}
}
// Hard constraints
int cpuPowerAvailable = computer.getCpuPower() - cpuPowerUsage;
if (cpuPowerAvailable < 0) {
hardScore += cpuPowerAvailable;
}
int memoryAvailable = computer.getMemory() - memoryUsage;
if (memoryAvailable < 0) {
hardScore += memoryAvailable;
}
int networkBandwidthAvailable = computer.getNetworkBandwidth()
- networkBandwidthUsage;
if (networkBandwidthAvailable < 0) {
hardScore += networkBandwidthAvailable;
}
// Soft constraints
if (used) {
softScore -= computer.getCost();
}
}
return DefaultHardAndSoftScore.valueOf(hardScore, softScore);
}
--------------------
I didn't understand how the cloudcomputers received it
13 years, 1 month
Hard constraint on selecting a skill
by André Fróes
Hello!
I'm still not getting good with drools rules, i'm trying several examples
and basic ones. Some i did without any problem and understood plenty well,
but when I try to make an approach to what i'm aiming, I'm not able to.
Right now I'm trying to compose this:
When
there's an workorder with skill
and there's and engineer with the skill and capable of doing that
workorder
then
the engineer should do it
So i tried something like this:
rule "assignSkillWOToSkilledEngineer"
when
$wo : WorkOrder( $requiredSkill : requiredSkill )
$engineer : Engineer(skill == $requiredSkill)
then
insertLogical(new IntConstraintOccurrence("assignSkillWOToSkilledEngineer",
ConstraintType.NEGATIVE_HARD,
1, $engineer));
end
i get no exceptions, but the sort is not working properly
13 years, 1 month
