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

[bharadwaj2012]

rule "set b value"
      salience 10
    no-loop
    when
        e : Person(b == " ");
    then
    e.setB("10");
update(e);
end

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

see this code here first rule will get fire b=10 sencod rule will not match
since b=10
or if u want to get the updated value in secnond rule e : Person(b == "10")

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