Ok, I changed my drl file and main method as follows, and it works. Thank
you.

package MyPackage

import MyPackage.Applicant;

rule "Is of not valid age"

when
        $a : Applicant( age < 18 )
then
        $a.setValid ( false );
end

rule "Is of valid age"
when

        $a : Applicant( age > 17 )
then
        $a.setValid ( true );
end

                KieServices kieServices = KieServices.Factory.get();
                KieContainer kContainer = kieServices.getKieClasspathContainer();
                StatelessKieSession kSession = kContainer.newStatelessKieSession();

                Applicant applicant = new Applicant("Mr John Smith", 16);

                assertFalse( applicant.isValid() );

                kSession.execute( applicant ) ;
                assertFalse ( applicant.isValid() );

                Applicant applicant2 = new Applicant("Mr Bill Wayne", 22);
                assertFalse( applicant2.isValid() );
                kSession.execute( applicant2 ) ;
                assertTrue ( applicant2.isValid() );




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