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...

 @Override
 public Set<HostId> getHosts(String network) {
 	return Collections.emptySet();
 }

Also remember to put the @Service 

Now that we have some code implemented lets try to run it, first though we must push the bundles we just coded. So let's start by building the code:

distributed@mininet-vm:~/onos-byon$ mci
[INFO] Scanning for projects...
...
[INFO] byon-app .......................................... SUCCESS [4.259s]
[INFO] byon-cli .......................................... SUCCESS [1.643s]
[INFO] byon .............................................. SUCCESS [0.104s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.719s
[INFO] Finished at: Fri Dec 12 14:28:16 PST 2014
[INFO] Final Memory: 30M/303M
[INFO] ------------------------------------------------------------------------
distributed@mininet-vm:~/onos-byon$ 

mci is an alias for maven clean install. Now that your project has successfully built your project let's push it up to the docker instances we launched earlier. 

distributed@mininet-vm:~/onos-byon$ ./byon-push-bits
Pushing byon to 172.17.0.2
Pushing byon to 172.17.0.3
Pushing byon to 172.17.0.4

The byon-push-bits command will take the build bundles from your local maven repository and push them into the ONOS docker instances. The command will also load and start the bundles, in fact every time you update your code you simply need to run byon-push-bits and the new bundles will be loaded and started in the remote ONOS instances.

Let's check that everything works by heading into ONOS and running a couple commands:

distributed@mininet-vm:~/onos-byon$ onos -w
Connection to 172.17.0.2 closed.
Logging in as karaf
Welcome to Open Network Operating System (ONOS)!
     ____  _  ______  ____   
    / __ \/ |/ / __ \/ __/    
   / /_/ /    / /_/ /\ \       
   \____/_/|_/\____/___/      
                             
Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown ONOS.
onos> list
...
159 | Active |  80 | 1.0.0.SNAPSHOT   | byon-app                              
160 | Active |  80 | 1.0.0.SNAPSHOT   | byon-cli 
onos> list-networks
test

So here we can see that ONOS have loaded the byon application and if we run the list-networks command  we see one fake network that we hard coded in this section.

Part 2: Make it so, Number one