[rules-users] how to use only updated value in drools

[learner]

Thanks for the reply.

Please find a basic structure of my drl file

rule "set b value"
      salience 10
    no-loop
    when
        e : Person(b == " ");
    then
    e.setB("10");
end
 
rule "b other than 10"
      salience 1
     no-loop
     when
      e : Person(b != 10)
     then
       System.out.println("error"+e.getB());
end    

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