How to pass and read the vlaues from map in Drools DRT template?

Question

I am trying to pass a map in DRT template of the of the drools like this

TEMPLATE

template "another map"
rule "test map_2"
no-loop true
dialect "java"
when
         namedmap:Map(map:"${namedTags}")
         review:FactNew(
         (compareNamedTags(namedmap,namedTags))
         )
then
System.out.println("Value is present in the list: "+ namedmap.get("objective"));
modify(review){setComment("accepted")}
end
end template

DRL GENERATED

rule "test map_2"
no-loop true
dialect "java"
when
         namedmap:Map(map:"{key1=value1, key2=value2}")
         review:FactNew(
         (compareNamedTags(namedmap,namedTags))
         )
then
System.out.println("Value is present in the list: "+ namedmap.get("key2"));
modify(review){setComment("accepted")}
end

FUNCTION TO CHECK THE MAP

function Boolean compareNamedTags(Map namedTagsMap, Map namedTags){
    System.out.println("Comparing the named Tags map");
    System.out.println("namedTag -->"+namedTagsMap );
    System.out.println("namedTagsMap -->"+namedTags );
    System.out.println("equality -->"+namedTagsMap.keySet().equals(namedTags.keySet()) );
    boolean flag = false;
    flag = namedTagsMap.equals(namedTags);
    return true;
}

While firing the rule there is no error but no output is printed. Also there is no call to the function why? Is this the right to pass the map in DRT and use it in the when condition of the rule.

Please provide some guidance on how one can pass a map in the DRT template and use it.