7:28 p.m.
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@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@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@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
7:43 p.m.
Does anyone have a working example of how to compile a decision table xls to
a package file (in code, not in guvnor), and then how to read that package
file in using knowledge agent applyChangeSet()?
My code above (that causes exception) is based on the Drools Expert
documentation sample code, but does not work.
the spreadsheet is not the problem, because I can load it into guvnor and
build the package from guvnor, and the guvnor-created package loads ok with
the knowledge agent. But if I stream out the package from my own code, the
resulting pkg file will not load using knowledge agent.
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8:11 p.m.
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(a)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@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@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@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
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
6:28 p.m.
I revised my method to write a single package and to use the Drools stream
classes:
KnowledgePackage pkg = packages.iterator().next();
DroolsObjectOutputStream out;
try {
out = new DroolsObjectOutputStream(new FileOutputStream(outFilePath));
DroolsStreamUtils.streamOut(out, pkg, Boolean.TRUE);
out.close();
} catch (IOException ex) {
logger.debug(ex.getMessage());
}
I tested this with the compression option and without, but knowledge agent
still cannot deserialize. I now get exception:
Caused by: java.io.OptionalDataException
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1339)
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)
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6:58 p.m.
It is a bit dated now (we're on 5.0.1) but this works on that release:
FileOutputStream fos = new
FileOutputStream(drlcFile);
ObjectOutputStream oos = new
ObjectOutputStream(fos);
oos.writeObject(pkg);
oos.close();
Joe
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of lhorton
Sent: Thursday, June 16, 2011 10:28 AM
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] KnowledgeAgent exception while trying to
deserialize KnowledgeDefinitionsPackage
I revised my method to write a single package and to use the Drools
stream
classes:
KnowledgePackage pkg = packages.iterator().next();
DroolsObjectOutputStream out;
try {
out = new DroolsObjectOutputStream(new
FileOutputStream(outFilePath));
DroolsStreamUtils.streamOut(out, pkg,
Boolean.TRUE);
out.close();
} catch (IOException ex) {
logger.debug(ex.getMessage());
}
I tested this with the compression option and without, but knowledge
agent
still cannot deserialize. I now get exception:
Caused by: java.io.OptionalDataException
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1339)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at
org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:2
05)
at
org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:1
74)
at
org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(Knowl
edgeAgentImpl.java:653)
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.html
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7:46 p.m.
That is what I was doing in my original source. Your code gives me the same
original exception:
Caused by: java.lang.ClassCastException: [B cannot be cast to
org.drools.rule.DialectRuntimeRegistry
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10:35 a.m.
More careful reading of org.drools.rule.Package shows that readExternal and
writeExternal aren't working on plain ObjectOutputStream in combination with
change set monitoring. You must
OutputStream os = new FileOutputStream( pkgPath );
ObjectOutputStream oos = new *Drools*ObjectOutputStream( os );
KnowledgePackage kPackage =
kBuilder.getKnowledgePackages().iterator().next();
oos.writeObject( kPackage );
oos.close();
org.drools.common.DroolsObjectOutputStream - although just a renaming
subclass of ObjectOutputStream - is not part of the "stable" API.
-W
On 16 June 2011 19:46, lhorton <LHorton(a)abclegal.com> wrote:
That is what I was doing in my original source. Your code gives me
the
same
original exception:
Caused by: java.lang.ClassCastException: [B cannot be cast to
org.drools.rule.DialectRuntimeRegistry
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4:57 p.m.
I should add that
DroolsStreamUtils.streamOut(...)
is not writing anything to a file; it's creating and returning a byte[].
-W
On 17 June 2011 10:35, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
More careful reading of org.drools.rule.Package shows that
readExternal
and writeExternal aren't working on plain ObjectOutputStream in combination
with change set monitoring. You must
OutputStream os = new FileOutputStream( pkgPath );
ObjectOutputStream oos = new *Drools*ObjectOutputStream( os );
KnowledgePackage kPackage =
kBuilder.getKnowledgePackages().iterator().next();
oos.writeObject( kPackage );
oos.close();
org.drools.common.DroolsObjectOutputStream - although justa renaming
subclass of ObjectOutputStream - is not part of the "stable" API.
-W
On 16 June 2011 19:46, lhorton <LHorton(a)abclegal.com> wrote:
> That is what I was doing in my original source. Your code gives me the
> same
> original exception:
>
> Caused by: java.lang.ClassCastException: [B cannot be cast to
> org.drools.rule.DialectRuntimeRegistry
>
> --
> View this message in context:
>
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> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
7:14 p.m.
That worked!!! Package created OK and was read by knowledge agent with no
error. thank you.
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days inactive
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days old
8 comments
4 participants
participants (4)
-
Joe White -
lhorton -
Lisa Horton
-
Wolfgang Laun