StorageService throws inconsistent exceptions for unknown hosts

 public String getNativeaddress(InetAddressAndPort endpoint, boolean withPort){
  ...
  try{                
    InetAddressAndPort address =   InetAddressAndPort.getByName(Gossiper.instance.getEndpointStateForEndpoint(endpoint).getApplicationState(ApplicationState.NATIVE_ADDRESS_AND_PORT).value);                
    return address.getHostAddress(withPort);            
}catch (UnknownHostException e) {
      throw new RuntimeException(e);            
 }
}

public void onChange(InetAddressAndPort endpoint, ApplicationState state, VersionedValue value){
...
try { 
  InetAddressAndPort address = InetAddressAndPort.getByName(value.value);   SystemKeyspace.updatePeerNativeAddress(endpoint, address); 
} catch (UnknownHostException e) 
{ 
    throw new RuntimeException(e); 
}
...
}

 public void rebuild(String sourceDc, String keyspace, String tokens, String specificSources, boolean excludeLocalDatacenterNodes){
  ...
  try                        {                            InetAddressAndPort endpoint = InetAddressAndPort.getByName(stringHost);                            if (FBUtilities.getBroadcastAddressAndPort().equals(endpoint))                            {                                throw new IllegalArgumentException("This host was specified as a source for rebuilding. Sources for a rebuild can only be other nodes in the cluster.");                            }                            sources.add(endpoint);                        }                        catch (UnknownHostException ex)                        {                            throw new IllegalArgumentException("Unknown host specified " + stringHost, ex);                        }
} 

private void handleStateBootreplacing(InetAddressAndPort newNode, String[] pieces){
 ...
try {
      oldNode = InetAddressAndPort.getByName(pieces[1]);        
} catch (Exception e) {            
   logger.error("Node {} tried to replace malformed endpoint {}.", newNode, pieces[1], e);            
   return;        
}
...
} 

 public List<String> getTokens(String endpoint) throws UnknownHostException    {        return getTokens(InetAddressAndPort.getByName(endpoint));    }