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Devebot Opflow for Java
There is a newer version: 0.1.3
package com.devebot.opflow.examples;

import java.util.HashMap;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.io.IOException;
import com.devebot.opflow.OpflowMessage;
import com.devebot.opflow.OpflowRpcWorker;
import com.devebot.opflow.OpflowRpcListener;
import com.devebot.opflow.OpflowRpcResponse;

public class OpflowRpcExampleWorker {

    public static void main(String[] argv) throws Exception {
        final Gson gson = new Gson();
        final JsonParser jsonParser = new JsonParser();
        final HashMap flowParams = new HashMap();
        flowParams.put("uri", "amqp://master:[email protected]?frameMax=0x1000");
        flowParams.put("operatorName", "tdd-opflow-queue");
        flowParams.put("responseName", "tdd-opflow-feedback");

        final OpflowRpcWorker rpc = new OpflowRpcWorker(flowParams);
        rpc.process(new OpflowRpcListener() {
            @Override
            public Boolean processMessage(OpflowMessage message, OpflowRpcResponse response) throws IOException {
                JsonObject jsonObject = (JsonObject)jsonParser.parse(message.getContentAsString());
                System.out.println("[+] ExampleWorker1 received: '" + jsonObject.toString() + "'");

                response.emitStarted();

                int number = Integer.parseInt(jsonObject.get("number").toString());
                FibonacciGenerator fibonacci = new FibonacciGenerator(number);

                while(fibonacci.next()) {
                    FibonacciGenerator.Result r = fibonacci.result();
                    response.emitProgress(r.getStep(), r.getNumber(), null);
                }

                String result = gson.toJson(fibonacci.result());
                System.out.println("[-] ExampleWorker1 finished with: '" + result + "'");

                response.emitCompleted(result);
                
                return null;
            }
        });
        
        rpc.process(new OpflowRpcListener() {
            @Override
            public Boolean processMessage(OpflowMessage message, OpflowRpcResponse response) throws IOException {
                JsonObject jsonObject = (JsonObject)jsonParser.parse(message.getContentAsString());
                System.out.println("[+] ExampleWorker2 received: '" + jsonObject.toString() + "'");

                response.emitStarted();

                int number = Integer.parseInt(jsonObject.get("number").toString());
                FibonacciGenerator fibonacci = new FibonacciGenerator(number);

                while(fibonacci.next()) {
                    FibonacciGenerator.Result r = fibonacci.result();
                    response.emitProgress(r.getStep(), r.getNumber(), null);
                }

                String result = gson.toJson(fibonacci.result());
                System.out.println("[-] ExampleWorker2 finished with: '" + result + "'");

                response.emitCompleted(result);
                
                return null;
            }
        });
    }
}