[rules-users] help, Unable to create Field Extractor for ....

[grupo cft ing sostware]

I meet working a simple example to interiorize with jboss rules and I obtain
the following error:


Exception in thread "main" org.drools.rule.InvalidRulePackage: Unable to
create Field Extractor for 'CantSegundos' : [Rule name=Valida Duracion nula,
agendaGroup=MAIN, salience=0, no-loop=false]

*org.drools.RuntimeDroolsException*: *org.drools.RuntimeDroolsException*:
java.lang.NullPointerExceptionUnable to create Field Extractor for
'CantSegundos' : [Rule name=valida Duracion , agendaGroup=MAIN, salience=0,
no-loop=false]
*

org.drools.RuntimeDroolsException*: *org.drools.RuntimeDroolsException*: *
java.lang.NullPointerException
*

at org.drools.rule.Package.checkValidity(*Package.java:408*)

at org.drools.common.AbstractRuleBase.addPackage(*AbstractRuleBase.java:288*
)

at prototipo.Prueba.main(*Prueba.java:27*)

the class main is:
*

public* *static* *final* *void* main(String[] args) *throws* Exception {

*             final* PackageBuilder builder = *new* PackageBuilder();

*            *builder.addPackageFromDrl( *new* InputStreamReader( Prueba.*
class*.getResourceAsStream( "regla.drl" ) ) );

*            final* RuleBase ruleBase = RuleBaseFactory.*newRuleBase*();

*           ruleBase*.addPackage( builder.getPackage() );

*            final* StatefulSession session = ruleBase.newStatefulSession();

*          *Integer segundos = *new* Integer(5);

*            *validaciones valida = *new* validaciones();

*           *valida.setCantSegundos(segundos);

*          *session.insert( valida);

*           *session.fireAllRules();

*in the rules is:*
*

package prototipo

import prototipo.validaciones;

rule "Valida Duracion nula"

when

           v : validaciones(CantSegundos == 0)

then

              v.setResultado("I");

             System.out.println( "obtenemos" + v.getResultado() );

end

rule "valida Duracion "when

              v : validaciones(CantSegundos > 0)

then

           v.setResultado("S");

            System.out.println( "obtenemos" + v.getResultado());

end
**

Thank you for helping me.

***

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