[rules-users] Calling drools into the Web Application.

[Esteban Aliverti]

Which version of drools are you using? RuleBase, RuleAgent and
WorkingMemory are not used anymore. And, this piece of log makes me think
if the version of Guvnor you are running is different to the version of
Drools you are using in your webapp:

org.drools.
rule.Package; local class incompatible: stream classdesc serialVersionUID =
510, local class serialV
ersionUID = 400

Seems you are using Guvnor 5.1 but Drools 4.0 in your webapp. If you are
just starting with drools, I'd suggest you to use the latest stable version
5.3.

Best Regards,

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com


2011/12/5 Jackson Cunha <jackson.cereb at gmail.com>

> So, let's talk about some points:
>
>    - You should not create a new knowledge base every time you need a
>    session, because construction of knowledge bases is very expensive. You
>    would do this at start of application applying Singleton pattern.
>    - If you already have a knowledge base, you are able to get parameters
>    from GET or POST using your preferred controller, instantiate your objects
>    using then and after that pass your objects for a new knowledge session
>    (stateless or statefull).
>
>
> On 5 December 2011 10:13, srinivasasanda <srinivasasanda at gmail.com> wrote:
>
>> this piece of application is working using drools project, but its not
>> working in (webapplication)
>>
>> i had a text box age and income that values i am trying passing this data
>> to
>> rule and run the rules.
>> i created one jsp , jsp call servlet, In servelt i called the below piece
>> of
>> code in servlet but not executing
>>
>> I am trying to include it this piece of code into webapplication (in
>> servlet
>> or jsp) it is showing error.
>>
>> public static final void runMain() {
>>        try {
>>                RuleAgent agent =
>> RuleAgent.newRuleAgent("/guvnor.properties");
>>            RuleBase ruleBase = agent.getRuleBase();
>>            WorkingMemory workingMemory = ruleBase.newStatefulSession();
>>            FactType ft= ruleBase.getFactType("sample.person");  //created
>> declarative model in guvnor
>>            Object obj=ft.newInstance();
>>            ft.set(obj,"age", 67);
>> //setting data into into person
>>            ft.set(obj, "income", 1000);
>>            workingMemory.insert(obj);
>>            workingMemory.fireAllRules();
>>            System.out.print(ft.get(obj, "age"));
>>            System.out.print(ft.get(obj, "income"));
>>              } catch (Throwable t) {
>>            t.printStackTrace();
>>        }
>>    }
>>
>>
>> 12:46:44,409 ERROR [STDERR] RuleAgent(default) INFO (Mon Dec 05 12:46:44
>> GMT
>> 2011): Configuring with
>>  newInstance=false, secondsToRefresh=-1
>> 12:46:44,419 ERROR [STDERR] RuleAgent(default) INFO (Mon Dec 05 12:46:44
>> GMT
>> 2011): Configuring pack
>> age provider : URLScanner monitoring URLs:
>> http://localhost:8082/guvnor-5.2.0.Final-jboss-as-5.1/or
>> g.drools.guvnor.Guvnor/package/sample/LATEST
>> 12:46:44,669 INFO  [STDOUT] INFO  05-12 12:46:44,669
>> (NilAuthenticator.java:authenticate:35)     All
>>  users are guests.
>>
>>
>> 12:46:44,359 ERROR [STDERR] java.lang.IllegalArgumentException: Could not
>> parse knowledge.
>> 12:46:44,359 ERROR [STDERR]     at
>> com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:115)
>> 12:46:44,359 ERROR [STDERR]     at
>> com.sample.DroolsTest.FireRools(DroolsTest.java:62)
>> 12:46:44,359 ERROR [STDERR]     at p1.Login.doGet(Login.java:37)
>> 12:46:44,359 ERROR [STDERR]     at
>> javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
>> 12:46:44,359 ERROR [STDERR]     at
>> javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
>>
>>
>> 12:46:44,699 ERROR [STDERR] RuleAgent(default) EXCEPTION (Mon Dec 05
>> 12:46:44 GMT 2011): org.drools.
>> rule.Package; local class incompatible: stream classdesc serialVersionUID
>> =
>> 510, local class serialV
>> ersionUID = 400. Stack trace should follow.
>> 12:46:44,699 ERROR [STDERR] java.io.InvalidClassException:
>> org.drools.rule.Package; local class inco
>> mpatible: stream classdesc serialVersionUID = 510, local class
>> serialVersionUID = 400
>> 12:46:44,699 ERROR [STDERR]     at
>> java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:562
>> )
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/Calling-drools-into-the-Web-Application-tp3561362p3561362.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
>
> ----------------------------------------------------------------------------------------------------------------
> Jackson Cunha Cassimiro (CereB)
> Bacharel em Ciencia da Computação - UFPI
> MSN: jackson.cereb at gmail.com
> Telefone Móvel +55 86 9928 1251
> Analista de Sistemas - Infoway - http://www.infoway-pi.com.br
> Missão Infoway - "Influenciar a Gestão de Sistemas de Saúde através de
> e-health"
>
> ("A vida é um combate que os fracos abate, aos bravos, aos fortes só pode
> exaltar" - Canção do Tamoio, Gonçalves Dias)
>
> ----------------------------------------------------------------------------------------------------------------
>
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