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

2011/12/5 Jackson Cunha <jackson.cereb@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@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
)

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--
----------------------------------------------------------------------------------------------------------------
Jackson Cunha Cassimiro (CereB)
Bacharel em Ciencia da Computação - UFPI
MSN: jackson.cereb@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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