WG: Serialization of packages: InvalidClassException / serialVersionUID
by Bernd Rücker
The exception of the KnowledgePackage serialization (by the way, this is
described in the docs, that you can serialize the KnowledgePackages!):
/home/bruecker/workspace/1/iKS2/iks_drools_rules/drools-rules.pkg
Exception in thread "main" java.io.NotSerializableException:
org.drools.definitions.impl.KnowledgePackageImp
at
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at
org.drools.util.DroolsStreamUtils.streamOut(DroolsStreamUtils.java:79)
at
org.drools.util.DroolsStreamUtils.streamOut(DroolsStreamUtils.java:61)
So this doesnt work either
(http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/ht
ml_single/index.html#d0e992):
3.2.4. Building and Deployment in Separate Processes
Both the KnowledgeBase and the KnowledgePackage are units of deployment
and serializable. This means you can have one machine do any necessary
building, requiring drools-compiler.jar, and have another machine deploy
and execute everything, needing only drools-core.jar.
Although serialization is standard Java, we present an example of how one
machine might write out the deployment unit and how another machine might
read in and use that deployment unit.
Example 3.15. Writing the KnowledgePackage to an OutputStream
ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream(
fileName ) );
out.writeObject( kpkgs );
out.close();
Example 3.16. Reading the KnowledgePackage from an InputStream
ObjectInputStream in = new ObjectInputStream( new FileInputStream(
fileName ) );
// The input stream might contain an individual
// package or a collection.
@SuppressWarnings( "unchecked" )
Collection<KnowledgePackage> kpkgs =
()in.readObject( Collection<KnowledgePackage> );
in.close();
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kpkgs );
The KnowledgeBase is also serializable and some people may prefer to build
and then store the KnowledgeBase itself, instead of the Knowledge
Packages.
Drools Guvnor, our server side management system, uses this deployment
approach. After Guvnor has compiled and published serialized Knowledge
Packages on a URL, Drools can use the URL resource type to load them.
Von: Bernd Rücker [mailto:bernd.ruecker@camunda.com]
Gesendet: Dienstag, 1. September 2009 17:21
An: 'rules-users(a)lists.jboss.org'
Betreff: Serialization of packages: InvalidClassException /
serialVersionUID
Hi!
I really struggled some time with serialization issues: I want to create a
pkg and package that with the jar. From there I want to read it during
runtime.
Easy I thought. Drools 5 way should be to serialize the KnowledgeBase,
right? At least, this is what the AntTask does.
If I try to serialize the KnowledgePackage I get an excpetion anyway:
Okay. Back to the KnowledgeBase. Serialized with Drools 5.0.0.M4 and try
to read it with 5.0.0.M5:
Caused by: java.io.InvalidClassException:
org.drools.impl.KnowledgeBaseImpl;
local class incompatible: stream classdesc serialVersionUID =
-4540376767025107954,
local class serialVersionUID = -3186110098262381425
So it seems Drools Packages are NOT compatible between minor versions?
This would be a disaster for deployment. Or do I serialize the wrong
thing? Unfortunately I didnt find anything in the docs about it.
Then I tried to do it the old Drools 4 way and serialize Package
objects, but same problem with a different serialVersionUID!
Why do these important classes dont have a serialVersionUID? Or how
should that be loaded? Must be a big issue with Govner, so I think there
must be a solution already?
Thanks for any help!
Cheers
Bernd
16 years, 10 months
Performance impact due to multiple packages?
by Shah, Malay
Hi,
I had a quick question on whether having rules in multiple packages
would have an effect on performance of running rules?
I have some piece of code, that generates drool code on the fly,
compiles it and stores the corresponding Package objects in cache. The
way I have set it up right now is every rule is compiled into its own
package. But, the rules are running extremely slow. I am trying to now
have all rules only in one package, but just curious to know before hand
whether this would lead to performance improvement? Has anyone gone
through this exercise before?
Any help would be appreciated.
Thanks
Malay Shah
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16 years, 10 months
[Droolsflow] Pagination of getTasksAssignedAsPotentialOwner
by Anderson vasconcelos
HI
It's possible to build a real pagination search using
MinaTaskClient.getTasksAssignedAsPotentialOwner() (Using Limit and Offset)?
Must I Override the implementation of BlockingTaskSummaryResponseHandler or
MinaTaskClient?
Thanks
16 years, 10 months
Collect and hibernate
by richarda
Hi again,
I wish to have a rule that when an Event has a certain uuid then load into
working memory all other events that have been received for this unit...
So I write the rule:
rule "Repeating"
when
$m : MessageAsEvent(uuid=="mesC:7")
$others : LinkedList() from collect (
MessageAsEvent(uuid=="mesC:7", id!=$m.id)
from hibernateSession.createQuery("from MessageAsEvent where
serial=?").setParameter(0,$m.serial).list()
)
then
System.out.println("Gathering m="+$m+" data="+$others);
end
Audit log shows: (wish cut and paste would work from Eclipse audit view)
<activationId>Repeating [131, 14]</activationId>
<rule>Repeating FAN</rule>
<declarations>$others=[MessageAsEvent:[124] uuid=mesC:7 serial=serial123
count=7, MessageAsEvent:[94] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[64] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[118] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[112] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[106] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[100] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[88] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[82] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[76] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[70] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[58] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[52] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[46] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[40] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[34] uuid=mesC:7 serial=serial123 count=7](131);
$m=MessageAsEvent:[130] uuid=mesC:7 serial=serial123
count=7(14)</declarations>
<ruleFlowGroup>Gathering</ruleFlowGroup>
So, you can see that the rule fired with $others having all the data, and
$m being the main uuid
but the output of the rule is:
Gathering m=MessageAsEvent:[130] uuid=mesC:7 serial=serial123 count=7
data=null
so, the $others has been translated to a null.
I'm trying to copy the Expert example:
import java.util.LinkedList;
rule "Send a message to all mothers"
when
$town : Town( name == 'Paris' )
$mothers : LinkedList()
from collect( Person( gender == 'F', children > 0 )
from $town.getPeople()
)
then
# send a message to all mothers
end
which indicates that $mothers will be available in the RHS
for reference, the audit log shows when the rule fires:
<org.drools.audit.event.ActivationLogEvent>
<type>6</type>
<activationId>Repeating [-1, 14]</activationId>
<rule>Repeating FAN</rule>
<declarations>$m=MessageAsEvent:[130] uuid=mesC:7 serial=serial123
count=7(14)</declarations>
<ruleFlowGroup>Gathering</ruleFlowGroup>
What am I doing wrong?
I basically want all the MessageAsEvent added to working memory, so later
other rules will do work on all the events.
Cheers
Ric
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16 years, 10 months
Drools Persistence Prob : No values going into 'VaraibleInstanceInfo' Table
by Pardeep.Ruhil＠lntinfotech.com
Hi,
I am working on persisting Drools session info into the database.
For that I have taken a sample project from
http://blog.athico.com/2009/09/drools-flow-variable-persistence.html.
When I tried to debug the project, no values are inserted into the table
'VaraibleInstanceInfo' table.
However In between the debugging I am able to see data going into the
table 'SessionInfo' , 'ProcessInstaceInfo', WorkItemInfo' table. But no
data is going into the 'VaraibleInstanceInfo' and
'ProcessInstanceEventInfo' table.
I have taken the code for VariableInstanceInfo.java,
SerializablePersistedVariable.java, JPAPersistedVariable.java and other
required classes for running the project from
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-persiste...
Kindly tell me what going wrong in this. I am using Mysql database for
persistence storage.
Thanks & Regards
Pardeep Ruhil
L&T Infotech Ltd
Mumbai
Ph: +919820283884
Larsen & Toubro Infotech Ltd.
www.Lntinfotech.com
This Document is classified as:
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16 years, 10 months
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16 years, 10 months
Specific Agenda strategy to control which rules to fire
by Costigliola Joel (EXT)
Hello all,
I need some help to to set a specific Agenda strategy in order to control finely which activated rules will be fired.
Problem context :
-----------------
My company is a bank where traders are making deals on markets, these deals must be classified in book, this is what we call "booking process".
Booking is done according to booking criteria : which trader has made the deal ? on which product ? wich market ? etc ...
A booking rule defines a set of criteria and the target book where the deal will classified, it also has a priority, note that it is ok that two booking rule have same priority.
I want to implement booking rule as Drools rule.
Several booking rule can be applied to a deal, in that case choosing the right booking rule to fire depends on the following algorithm :
- look all the activated booking rule of the highest priority,
--- if there is a unique rule apply it
--- if there is no unique rule (0 rule or more than one), look at rules of a lesser priority and apply the same logic.
Next section is an example that will clear things (I hope).
Example :
---------
A deal D1 has been done by Alex on NY market to buy Google stocks.
We have 3 booking rules :
- BR1 : criteria = trader=Alex / book = B1
- BR2 : criteria = trader=Alex and product = google stock / book = B2
As BR2 is more precise than BR1, il will matches the deal and book it in B1
If the deal was on another product, BR1 would have been applied.
Things gets more complicated when 2 rules of same priority can be applied.
Let's imagine we add the following booking rule
- BR3 : criteria = trader=Alex and market = NY / book = B3
We have a problem to book D1 since BR2 and BR3 can be applied but have same priority.
We can't choose one over the other thus we must apply a less precise/prioritary rule (if unique at its own precision level).
In my example, that would lead to apply BR1.
Question :
----------
If I define BR1,BR2,BR3 as Drools rules, how can I tell Drools :
- to execute a rule only if there is no other active rule with same precision that could be applied ?
- to look for a unique matching rule with less precision level ?
I think it's the Agenda responsibility to take this decision, but I don't know how implement that.
Can you give some advices on that ?
Thanks for your lights in advance,
Regards,
Joel
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16 years, 10 months
Can DSL / DSLR be loaded in a changeset?
by Pegram, Macon
All,
I asked this question earlier this week, but didn't get a response. I
may have provided too much information, so let me distill it down to
this simple question....
Can DSL/DSLR files be loaded and accessed as part of a KnowledgeBase
constructed using the KnowledgeAgent / changeset model in Drools 5.0.1
My test code, attached to my earlier post, suggests this does not work.
Macon
16 years, 10 months
java.lang.NoClassDefFoundError
by Hemanth kumar
hi iam working on sample drools project.
In that i was dynamically loading a fact ang running the rule engine.
Based on the reply from the people of y previous post i have made some
modifications.
In the Eclipse editor it works fine.but when i call it externally it is
throwing the error.I guess class path was recognised by the ruleengine
------------------------------------------------------------------------------------
java class
static String path="C:\\Program Files\\Apache Software Foundation\\Tomcat
6.0\\webapps\\JStudio\\WEB-INF\\classes\\";
try{
System.out.println("Initializing Fact....");
URL[] urls = new URL[]{ new URL("file://"+path) };
ClassLoader loader = new URLClassLoader(urls);
Class clazz = loader.loadClass("test.Message");
Object factObj = clazz.newInstance();
Method method = clazz.getMethod("setMessage", new
Class[]{String.class});
Method method1 = clazz.getMethod("getMessage");
//System.out.println("facts loaded\n");
method.invoke(factObj, new Object[]{"Hello"});
System.out.println("initializing packageBuilder");
PackageBuilderConfiguration config = new PackageBuilderConfiguration();
config.setClassLoader(loader);
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder(config);
System.out.println("finding Rule");
kbuilder.add(ResourceFactory.newClassPathResource("test/Sample.drl"),ResourceType.DRL);
if (kbuilder.hasErrors())
throw new RuntimeException("Unable to compile rules. " +
kbuilder.getErrors().toString());
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(new
RuleBaseConfiguration(loader));
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
StatelessKnowledgeSession session =
kbase.newStatelessKnowledgeSession();
System.out.println("running rule....... \n");
session.execute(factObj);
System.out.println("\nend...\n");
}
catch (Throwable t) {
t.printStackTrace();
}
---------------------------------------------------------------------------------
tomcat output console
http://www.nabble.com/file/p26109542/console.PNG console.PNG
suggest me any ideas
Hemanth
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16 years, 10 months
[droolsflow] JPAVariablePersister - Multiple Entries for Variables passed into ForEach
by Bill Tarr
I'm seeing some strange behavior in the JPAPersistedVariable.
In this case, my Claim has 2 Role objects. So my Claim workflow has a ForEach, passing in a Role to each.
Here is the console output, notice the same Role @Entity having JPAPersistedVariable objects added for them twice.
Variable claim -> Persisting external Entity for the first time =com.csatp.svc.rulesmgr.claim.Claim @ 3881fab4
Saving JPAPersistedVariable id=1 entityId=1 class=com.csatp.svc.rulesmgr.claim.Claim value=com.csatp.svc.rulesmgr.claim.Claim @ 51414b4
<<<<< Persisting variable claim = com.csatp.svc.rulesmgr.claim.Claim @ 51414b4
Variable 3:2:role -> Updating external Entity = com.csatp.svc.rulesmgr.claim.Role @ a87f09d8
Saving JPAPersistedVariable id=2 entityId=1 class=com.csatp.svc.rulesmgr.claim.Role value=com.csatp.svc.rulesmgr.claim.Role @ a87f09d8
<<<<< Persisting variable 3:2:role = com.csatp.svc.rulesmgr.claim.Role @ a87f09d8
Variable 3:3:role -> Updating external Entity = com.csatp.svc.rulesmgr.claim.Role @ b3ee9f8b
Saving JPAPersistedVariable id=3 entityId=2 class=com.csatp.svc.rulesmgr.claim.Role value=com.csatp.svc.rulesmgr.claim.Role @ b3ee9f8b
<<<<< Persisting variable 3:3:role = com.csatp.svc.rulesmgr.claim.Role @ b3ee9f8b
Variable role -> Updating external Entity = com.csatp.svc.rulesmgr.claim.Role @ a87f09d8
Saving JPAPersistedVariable id=4 entityId=1 class=com.csatp.svc.rulesmgr.claim.Role value=com.csatp.svc.rulesmgr.claim.Role @ a87f09d8
<<<<< Persisting variable role = com.csatp.svc.rulesmgr.claim.Role @ a87f09d8
Variable role -> Updating external Entity = com.csatp.svc.rulesmgr.claim.Role @ b3ee9f8b
Saving JPAPersistedVariable id=5 entityId=2 class=com.csatp.svc.rulesmgr.claim.Role value=com.csatp.svc.rulesmgr.claim.Role @ b3ee9f8b
<<<<< Persisting variable role = com.csatp.svc.rulesmgr.claim.Role @ b3ee9f8b
I've attached a screenshot of my SQL Server, lets see if it gets scrubbed out...
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16 years, 10 months
