[rules-users] KnowledgeAgent exception while trying to deserialize KnowledgeDefinitionsPackage
Wolfgang Laun
wolfgang.laun at gmail.com
Wed Jun 15 14:11:33 EDT 2011
For the KnowledgeAgent, a resource of type PKG is a single KnowledgePackage
object; reading is done like this, according to KnoledgeAgentImpl
InputStream is = null;
KnowledgePackageImp kpkg = null;
try {
is = resource.getInputStream();
Object object = DroolsStreamUtils.streamIn( is );
if ( object instanceof KnowledgePackageImp ) {
kpkg = ((KnowledgePackageImp) object);
} else {
kpkg = new KnowledgePackageImp( (Package) object );
}
for ( Rule rule : kpkg.pkg.getRules() ) {
rule.setResource( resource );
}
} catch ( Exception ex ) {
...
} finally {
...
}
return kpkg;
-W
2011/6/14 Lisa Horton <LHorton at abclegal.com>
> Drools 5.1.1
>
> I create a package from a decision table:
>
> ObjectOutputStream out;
>
> try {
>
> out = new
> ObjectOutputStream(new FileOutputStream(“venue.pkg”));
>
>
> out.writeObject(knowledgeBase.getKnowledgePackages()); // knowledgeBase
> previously loaded from spreadsheet
>
> out.close();
>
> } catch (IOException ex) {
>
>
> logger.debug(ex.getMessage());
>
> }
>
>
>
> I can load this package directly into a knowledge base and run rules with
> no errors:
>
> ObjectInputStream in;
>
> Collection<KnowledgePackage> packages =
> null;
>
> try {
>
> in = new
> ObjectInputStream(new FileInputStream(“venue.pkg”));
>
> packages =
> (Collection<KnowledgePackage>) in.readObject();
>
> in.close();
>
> } catch (Exception ex) {
>
>
> logger.debug(ex.getMessage());
>
> }
>
>
> knowledgeBase.addKnowledgePackages(packages);
>
>
>
> HOWEVER if I try to load the same package using a knowledge agent:
>
> KnowledgeAgent kagent =
> KnowledgeAgentFactory.newKnowledgeAgent("TheAgent");
>
>
> kagent.applyChangeSet(ResourceFactory.newFileResource(“ChangeSet.xml”));
>
>
>
> The package does not load. Any idea of the cause of these exceptions?
>
>
>
> [2011:06:165 10:06:159:info] ResourceChangeNotification created
>
> [2011:06:165 10:06:161:info] ResourceChangeScanner reconfigured with
> interval=60
>
> [2011:06:165 10:06:161:info] ResourceChangeScanner created with default
> interval=60
>
> [2011:06:165 10:06:162:debug] ResourceChangeNotification monitor added
> monitor=org.drools.io.impl.ResourceChangeScannerImpl at 5c73a7ab
>
> [2011:06:165 10:06:163:debug] KnowledgeAgent building resource map
>
> [2011:06:165 10:06:163:info] KnowledegAgent has started listening for
> ChangeSet notifications
>
> [2011:06:165 10:06:163:info] KnowledgeAgent created, with configuration:
>
> monitorChangeSetEvents=true scanResources=true scanDirectories=true
> newInstance=true
>
> [2011:06:165 10:06:413:info] KnowledgeAgent applying ChangeSet
>
> [2011:06:165 10:06:415:debug] KnowledgeAgent notifier subscribing to
> resource=[ClassPathResource path='com/abclegal/rules/resources/venue.pkg']
>
> [2011:06:165 10:06:415:debug] ResourceChangeNotification subscribing
> listener=org.drools.agent.impl.KnowledgeAgentImpl at 5fe0f2f6 to
> resource=[ClassPathResource path='com/abclegal/rules/resources/venue.pkg']
>
> [2011:06:165 10:06:416:debug] ResourceChangeScanner subcribing
> notifier=org.drools.io.impl.ResourceChangeNotifierImpl at 296f25a7 to
> resource=[ClassPathResource path='com/abclegal/rules/resources/venue.pkg']
>
> [2011:06:165 10:06:416:debug] KnowledgeAgent rebuilding KnowledgeBase using
> ChangeSet
>
> [2011:06:165 10:06:556:exception]
>
> java.lang.RuntimeException: KnowledgeAgent exception while trying to
> deserialize KnowledgeDefinitionsPackage
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:664)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:889)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:704)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:584)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:185)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:168)
>
> at
> com.abclegal.rules.RulesUtilities.createKnowledgeBaseUsingAgent(RulesUtilities.java:91)
>
> at
> com.abclegal.rules.RulesBenchmarks.benchmarkVenueSelection(RulesBenchmarks.java:39)
>
> at com.abclegal.rules.RulesBenchmarks.main(RulesBenchmarks.java:33)
>
> Caused by: java.lang.ClassCastException: [B cannot be cast to
> org.drools.rule.DialectRuntimeRegistry
>
> at org.drools.rule.Package.readExternal(Package.java:197)
>
> at
> org.drools.definitions.impl.KnowledgePackageImp.readExternal(KnowledgePackageImp.java:115)
>
> at
> java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1791)
>
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1750)
>
> at
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
>
> at java.util.ArrayList.readObject(ArrayList.java:593)
>
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>
> at java.lang.reflect.Method.invoke(Method.java:597)
>
> at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
>
> at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
>
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
>
> at
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
>
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
>
> at
> org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:205)
>
> at
> org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:174)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:653)
>
> ... 8 more
>
> [2011:06:165 10:06:856:debug] KnowledgeAgent obtaining pkg
> resource=[ClassPathResource path='com/abclegal/rules/resources/venue.pkg']
>
> [2011:06:165 10:06:856:exception]
>
> java.lang.RuntimeException: KnowledgeAgent exception while trying to
> deserialize KnowledgeDefinitionsPackage
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:914)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:704)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:584)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:185)
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:168)
>
> at
> com.abclegal.rules.RulesUtilities.createKnowledgeBaseUsingAgent(RulesUtilities.java:91)
>
> at
> com.abclegal.rules.RulesBenchmarks.benchmarkVenueSelection(RulesBenchmarks.java:39)
>
> at com.abclegal.rules.RulesBenchmarks.main(RulesBenchmarks.java:33)
>
> Caused by: java.lang.NullPointerException
>
> at
> org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:906)
>
> ... 7 more
>
> [2011:06:165 10:06:865:info] KnowledgeAgent new KnowledgeBase now built and
> in use
>
> [2011:06:165 10:06:865:debug] KnowledgeAgent finished rebuilding
> KnowledgeBase using ChangeSet
>
>
>
>
>
> _______________________________________________
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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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