JavaPairRDD<String,List<String>> combination= keyValue.flatMapToPair(new PairFlatMapFunction<Tuple2<String,List<String>>, String, List<String>>() {
            @Override
            public Iterable<Tuple2<String, List<String>>> call(Tuple2<String, List<String>> stringListTuple2) throws Exception {
                Collection<Tuple2<String,List<String>>> coll = new ArrayList<>();
                keyValue.foreach(k->{
                    String key=stringListTuple2._1();
                    key+=k._1();
                    List<String> res= (List<String>) CollectionUtils.intersection(k._2(),stringListTuple2._2());
                    coll.add(new Tuple2<String,List<String>>(key,res));
                });
                return coll;
            }
        });