Apache Storm (Java): Bolt not receiving tuple from other Bolt

Question

I'm working with Apache Storm with this topology:

 TopologyBuilder builder = new TopologyBuilder();   
    builder.setSpout("socketspout", new SocketSpout(IP_HOST,PORT));
    builder.setBolt("filterone", new FilterOne()).shuffleGrouping("socketspout");
    builder.setBolt("filtertwo", new FilterTwo()).shuffleGrouping("filterone");

The methods of the first bolt are (FilteOne), this class extends BaseRichBolt:

public void declareOutputFields(OutputFieldsDeclarer declarer) {
    declarer.declare(new Fields("ID1","signal1"));
}

 public void execute(Tuple input) {
    int sig;
    try {
        sig=input.getInteger(1)*2;
        System.out.println("Filter one.."+Integer.toString(sig));
        collector.emit("ack1", new Values(input.getString(0), sig));
        collector.ack(input);
    } catch (Exception e) {
        collector.fail(input);
    }
}

The methods of the second bolt are (FilteTwo), this class extends BaseRichBolt too:

public void declareOutputFields(OutputFieldsDeclarer declarer) {
}

 public void execute(Tuple input) {
    int sig;
    try {
        sig=input.getInteger(1)+1;
        System.out.println("Filter two.."+Integer.toString(sig));
        collector.ack(input);
    } catch (Exception e) {
        collector.fail(input);
    }
}

When execute the program mode localcluster I can see the first bolt emit the tuple but the second never receive the tuple......

Answer 1

The problem was solved modifying the filter one code from collector.emit("ack1", new Values(input.getString(0), sig)); to collector.emit( new Values(input.getString(0), sig));