Drools 5.6.0.Final PKG vs DRL infinite loop
by gboro54
We are using drools 5.6.0.Final and the same version of Guvnor. When we run
the source file of a package from Guvnor everything works as expected. When
we take the same rules and create a package we get stuck in an infinite loop
of rules firing(I have a listener logging every time a rule is
created/fired). Why would there be a difference if the rules don't change
between the source and the pkg?
We build the kbase as follows:
KnowledgeBuilderConfiguration config = KnowledgeBuilderFactory
.newKnowledgeBuilderConfiguration();
config.setOption(PropertySpecificOption.ALWAYS);
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
.newKnowledgeBuilder(config);
for (ResourcePair pair : pairs) {
/* kbuilder.add(
ResourceFactory.newClassPathResource("rule-sets/2014/feb/"+pair.resourceName),
ResourceType.getResourceType(pair.resourceType));*/
kbuilder.add(
ResourceFactory.newClassPathResource(pair.resourceName),
ResourceType.getResourceType(pair.resourceType));
}
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
StringBuilder sb = new StringBuilder();
for (KnowledgeBuilderError error : errors) {
sb.append(error + "\n");
System.out.println(sb);
}
throw new IllegalArgumentException("Could not parse knowledge.
\n"
+ sb);
}
this.knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase();
this.knowledgeBase
.addKnowledgePackages(kbuilder.getKnowledgePackages());
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11 years, 7 months
How to read XML using XMLPackageReader-Drools-compiler.5.2.1.final?
by Praveen
Hi,
I am using Drools-compiler.5.2.1.final.
I am trying to convert an drl to xml and vice versa using DrlParser,
DrlDumper, XMLPackageReader and XML Dumper.
Drl to XML conversion works fine but XML to Drl throws NPE.
I have placed the XML file under a folder called sample.
NPE is thrown at line 5..
Also attached is the exception.
Please suggest.
TIA.
Reader source = new InputStreamReader(
DroolsConversionHelper.class.getResourceAsStream(xmlFileName));
PackageBuilderConfiguration conf = new PackageBuilderConfiguration();
XmlPackageReader reader = new
XmlPackageReader(conf.getSemanticModules());
DrlDumper dumper = new DrlDumper();
//line 5 reader.read(source);
PackageDescr descr = reader.getPackageDescr();
String test = dumper.dump(descr);
System.out.println(test);
java.lang.NullPointerException
at
org.drools.xml.ExtensibleXmlParser.resolveSchema(ExtensibleXmlParser.java:696)
at
org.drools.xml.ExtensibleXmlParser.resolveEntity(ExtensibleXmlParser.java:622)
at
com.sun.org.apache.xerces.internal.util.EntityResolverWrapper.resolveEntity(Unknown
Source)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityManager.resolveEntity(Unknown
Source)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.resolveDocument(Unknown
Source)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.findSchemaGrammar(Unknown
Source)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(Unknown
Source)
Regards,
Praveen.
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11 years, 7 months
Drools Planner: Vehicle routing problems
by davidglassborow
Hi,
as discussed the other day with Ge0ffrey on IRC, I've been trying to
get some vehicle routing done using the new TSP / chaining functionality in
drools planner.
I've written an example, but am having problems with the chaining of jobs
together. After pulling my hair out, I've put together an example into my
fork of planner, showing a simplified example of how I am approaching it,
and the problem that can be replicated.
https://github.com/davidglassborow/drools-planner/tree/vehicle_routing
It is a very simple console app along the same lines as the hello world
example for NQueens.
On running it will print out the chains, and you will see the some Jobs
appear more than once in the same list.
On the planning variable it seems to be get assigned in front of itself,
I've put some notes in the source, and checked that the same doesn't occur
in your TSP example.
I'm not sure if its a bug in the way I've setup things, or whether its an
issue in the chain move code.
Greatly appreciated if anybody in the know gets a chance to have a look.
Thanks,
David
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11 years, 8 months
"Cannot find KieModule" with kieServices.newKieContainer() with LATEST or RELEASE instead of explicit version number (eg: 0.0.1)
by Matteo Mortari
Hello,
in the hope this could save time if someone has been experiencing same
issue. Drools 6.0.1.Final
I had message "Cannot find KieModule" with kieServices.newKieContainer()
with LATEST or RELEASE , instead of explicit version number (eg: 0.0.1) on
a application where the KIE module Rule artifact project kjar has been
locally-installed from remote Maven repository, that is the right hand side
of this diagram:
http://docs.jboss.org/drools/release/6.0.1.Final/drools-docs/html_single/...
Meaning that before launching Application, I performed
mvn org.apache.maven.plugins:maven-dependency-plugin:2.8:get
-Dartifact=com.acme:X:LATEST -DrepoUrl=
http://nexus-hostname/nexus/content/repositories/releases/
Then:
kieServices.newKieContainer() with LATEST,
kieServices.newKieContainer() with RELEASE,
failed with stack trace:
Exception in thread "main" java.lang.RuntimeException: Cannot find
KieModule: com.acme:X:RELEASE
at
org.drools.compiler.kie.builder.impl.KieServicesImpl.newKieContainer(KieServicesImpl.java:86)
at (...)
But kieServices.newKieContainer() with a fixed version, eg.: 0.0.2 did
indeed worked OK, if installed in the local .m2 repository.
To avoid this issue, I found only 3 possible workarounds
1 use mvn maven-dependency-plugin:go-offline but did not work all of the
time
2 manually ensure maven-metadata-local.xml file is generate in local .m2
repository
3 just download manually .jar and .pom of the remote maven repo, and then
install with mvn install:install-file
In this case, of workaround kieServices.newKieContainer() works OK with
all the version LATEST, RELEASE, and fixed version number.
Raise jira DROOLS-419 with more details and example projects, please don't
hate me if was just me missing something or not-Drools issue actually
=P
In my defense I had good intentions saving somebody's else time in case
same strange behavior, which is really strange because to me it worked only
with explicit fixed version number, and that was really bizarre ;)
Hope this helps,
Ciao
MM
11 years, 9 months
Drools 6 support for changeset
by wtang
I have a requirement in which when a rule is changed, the change needs to be
reflected immediately without retarting the system.
In Drools 5.x we can use the changeset.xml with the knowlegde agent. Now in
Drool 6.0 we have Kie API.
1) does Kie support changeset.xml?
2) Upper management don't want to use kie, they want to use jsr94. Does
jsr94 support changeset.xml?
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11 years, 9 months
Drools Planner: what if possible values of a PlanningVariable are dependent of another one?
by Willem van Asperen
Hi All,
I have a PlanningEntity that has several planning variables, say A and
B. Now, if A is O then B can be X or Y and when A is P then B can be Y or Z.
I see two routes:
* create a solution property that generates X, Y and Z as alternatives
for B and rely on the score rules to dismiss improper values,
depending on the value of A
* create an entity property that only generates the possible values
for B (i.e. X,Y for A=O and Y,Z for A=P)
What is the best route?
(Alternatively I do not use the constructionHeuristic and just start of
my solution with a randomly (but correct) generated solution)
Regards,
Willem
11 years, 10 months
Spring, KnowledgeAgent, and Guvnor
by paulB
I'm having a problem connecting my KnowledgeAgent to a package in Guvnor.
I'm using Spring to instantiate the KnowledgeAgent. The agent initializes
perfectly well when I point to a local change-set that in-turn points to a
local rule. However, even though I have the same rule in a package in
Guvnor, the KnowledgeAgent fails with the following exception when I point
to the package's change-set in Guvnor:
The code at KnowledgeBaseImpl.java:148 is (using 5.3.0.Final):
Here is the simple rule in the Guvnor as returned by the URL for the package
source URL:
Here is the local change-set definition. The line that is commented is the
failing resource, whereas the local file resource works fine:
Guvnor is residing on a Tomcat server.
I could not find anything related to this on the forum. Thank you for any
hints.
-Paul
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11 years, 10 months
