[rules-users] Issue with From Clause - Class Cast Error
Hi All,
I am having a very strange issue with my knowledge base... I have the
following Rule:
...
rule root_host
no-loop true
ruleflow-group 'initialize-appliance-definitions'
when
$app:ApplianceType
(
type == ApplianceTypeIdentifier.APPLIANCE_ROOT
);
not( ApplianceTypeObject() from $app.getObjectTypes());
then
//Do something
end;
...
And the ApplianceType class is defined as:
...
public class ApplianceType
{
private ApplianceTypeIdentifier type;
private ListApplianceTypeObject objectTypes;
public ApplianceType(ApplianceTypeIdentifier type,
ListApplianceTypeObject initialObjectTypes)
{
this.type = type;
if(initialObjectTypes == null)
this.objectTypes = new ArrayListApplianceTypeObject();
else
this.objectTypes = initialObjectTypes;
}
public ApplianceType(ApplianceTypeIdentifier type)
{
this(type, null);
}
public ApplianceTypeIdentifier getType()
{
return type;
}
public ListApplianceTypeObject getObjectTypes() {
return objectTypes;
}
}
When attempting to fireAllRules() I receive the following error:
...
Caused by: java.lang.ClassCastException: org.drools.reteoo.FromNode
incompatible with org.drools.reteoo.BetaNode
at org.drools.reteoo.ReteooBuilder.resetMasks(ReteooBuilder.java:303)
at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:267)
at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:459)
at
org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:1107)
at
org.drools.common.AbstractRuleBase.mergePackage(AbstractRuleBase.java:851)
at
org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:610)
at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)
at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)
at
com.q1labs.frameworks.drools.DroolsEngine.getKnowledgeBase(DroolsEngine.java:139)
at
com.q1labs.frameworks.drools.DroolsEngine.onInit(DroolsEngine.java:50)
at
com.q1labs.frameworks.naming.FrameworksNaming.initializeNewComponent(FrameworksNaming.java:951)
... 3 more
Any thoughts? I have been using from clauses just like this throughout my
project, and have had no issues with it to this point (even those which did
not use generics).
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Re: [rules-users] Issue with From Clause - Class Cast Error
Thanks for the fast response! I'll attempt to post as much as I can, splicing
out any case specific info.
The Java code surrounding my invocation is as follows:
=
//Get a list of all knowledgebase resources
ListFile kbList = config.getCompleteKBList(); //Note that this is a simply
a collection of absolute file paths containing DRL and RF files
if(kbList == null)
throw new FrameworksException(Failed to get list of knowledgebase
resources. Configuration returned null);
//Add all of the resources we found
for(File file : kbList)
{
if(file == null)
continue;
if(log.isDebugEnabled())
log.debug(Adding resource file: + file.getAbsolutePath());
if(file.getName().endsWith(KB_FILE_EXT))
kbBuilder.add(ResourceFactory.newFileResource(file), ResourceType.DRL);
else if(file.getName().endsWith(RF_FILE_EXT))
kbBuilder.add(ResourceFactory.newFileResource(file), ResourceType.DRF);
else
throw new FrameworksException(Found invalid file in our knowledgebase
list! It was: \ + file.getAbsolutePath() + \. This extension is not
supported);
// Check the builder for errors
if (kbBuilder.hasErrors())
{
throw new FrameworksException( + file.getAbsolutePath() + : Unable
to compile knowledge base: + kbBuilder.getErrors().toString());
}
}
KnowledgeBase kb = kbBuilder.newKnowledgeBase();
kb.addKnowledgePackages(kbBuilder.getKnowledgePackages());
=
The above line is the point at which the error occurs.
I am using several other rule files, but I have removed them while I am
debugging this issue. I am left with simply this rule file:
=
package removed.kb.appliances
import removed.ApplianceType;
import removed.ApplianceTypeObject;
import removed.ApplianceTypeObjectHost;
import removed.ApplianceTypeIdentifier;
import java.util.List;
dialect java;
rule root_appliance
ruleflow-group 'initialize-appliance-definitions'
when
not
(
ApplianceType
(
type == ApplianceTypeIdentifier.APPLIANCE_ROOT
);
);
then
ApplianceType appliance = new
ApplianceType(ApplianceTypeIdentifier.APPLIANCE_ROOT, null);
insert(appliance);
end;
rule root_host
no-loop true
ruleflow-group 'initialize-appliance-definitions'
when
$app:ApplianceType
(
type == ApplianceTypeIdentifier.APPLIANCE_ROOT
);
not( ApplianceTypeObject() from $app.getObjectTypes());
then
//Do something
end;
==
If there is any more information I can provide please let me know. I believe
that is everything.
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Re: [rules-users] Issue with From Clause - Class Cast Error
I am using 5.4.0 Final Downloaded about a month ago. From drools-core-5.4.0.Final.jar: Specification-Title: Drools :: Core Specification-Version: 5.4.0.Final -- View this message in context: http://drools.46999.n3.nabble.com/Issue-with-From-Clause-Class-Cast-Error-tp4019846p4019850.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Issue with From Clause - Class Cast Error
Great! Thanks so much Davide (and laune). Cheers, Taylor -- View this message in context: http://drools.46999.n3.nabble.com/Issue-with-From-Clause-Class-Cast-Error-tp4019846p4019854.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] How to read ruleflow file?
Hi there, This is likely irrelevant to you, but I run things using the Drools framework (not Guvnor). In case it is helpful, here is my simple setup: KnowledgeBuilder kbBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); File file = new File(/test/myFile.rf); kbBuilder.add(ResourceFactory.newFileResource(file), ResourceType.DRF); //Insert your KB files here as ResourceType.DRL if (kbBuilder.hasErrors()) e.printStackTrace(); KnowledgeBase kb = kbBuilder.newKnowledgeBase(); kb.addKnowledgePackages(kbBuilder.getKnowledgePackages()); StatefulKnowledgeSession session = kb.newStatefulKnowledgeSession(); session.startProcess(myFlow); session.fireAllRules(); Where of course myFlow is the name of my flow, and the file is the full path to your ruleflow. -- View this message in context: http://drools.46999.n3.nabble.com/How-to-read-ruleflow-file-tp4019812p4019833.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Eclipse - Drools Plugin - Compilation Errors
More details... The error is as you would expect: Description ResourcePathLocationType The method getDeploymentTemplate() is undefined for the type Rule_init_282bd9bb0e30465c8efc3f0b1b9e23f2 init.drl/path to file removed intentionally line 11 Drools Error Eclipse simply cannot resolve the function when it is referenced by another file in the same package; however, the engine can at runtime. -- View this message in context: http://drools.46999.n3.nabble.com/Eclipse-Drools-Plugin-Compilation-Errors-tp4019781p4019782.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Eclipse - Drools Plugin - Compilation Errors
Resolved the issue. I found Allow cross references in DRL files. However, this did not work immediately. I needed to clean my workspace, and ensure that my files were also placed in the correct directory structure to match my package name(s). -- View this message in context: http://drools.46999.n3.nabble.com/Eclipse-Drools-Plugin-Compilation-Errors-tp4019781p4019785.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
