Can't get UDF to show up in ksqlDB

Hi Confluent Team ,

I am trying to implement UDF , tried the sample code provided for UDF as given below , added confluent dependencies for UDF to compile this , able to compile and created the jar.

package sample.artifact;


import io.confluent.ksql.function.udaf.Udaf;
import io.confluent.ksql.function.udaf.UdafDescription;
import io.confluent.ksql.function.udaf.UdafFactory;

import java.util.List;
import java.util.LinkedList;
import java.util.Iterator;

@UdafDescription(name = "rolling_sum",
author = "example user",
version = "2.0.0",
description = "Maintains a rolling sum of the last 3 integers of a stream.")

public class RollingSumUdaf {
	
	private RollingSumUdaf() 
	{
		
    }

    @UdafFactory(description = "Sums the previous 3 integers of a stream, discarding the oldest elements as new ones arrive.")
    public static Udaf<Integer, List<Integer>, Integer> createUdaf() 
    {
        return new RollingSumUdafImpl();
    }

    private static class RollingSumUdafImpl implements Udaf<Integer, List<Integer>, Integer> 
    {

        private final int CAPACITY = 3;

        @Override
        public List<Integer> initialize() 
        {
            return new LinkedList<Integer>();
        }

        @Override
        public List<Integer> aggregate(Integer newValue, List<Integer> aggregateValue) 
        {
            aggregateValue.add(newValue);

            if (aggregateValue.size() > CAPACITY) 
            {
                aggregateValue = aggregateValue.subList(1, CAPACITY + 1);
            }

            return aggregateValue;
        }

        @Override
        public Integer map(List<Integer> intermediate) 
        {
            return intermediate.stream().reduce(0, Integer::sum);
        }

        @Override
        public List<Integer> merge(List<Integer> aggOne, List<Integer> aggTwo) 
        {
            return aggTwo;
        }
    }
}

Post creation of jar , placed the jar file in ksql/ext folder , and restarted the server but i can’t see newly created function created using udf as part of show functions , kindly suggest if I am missing anything.

Thanks,
Tarun