2007/8/22, grupo cft ing sostware <infocft@gmail.com >:

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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