Develop Reference

Adding Potion Effect when Item is in hand Minecraft Forge 1.16.5

So Basically I have been searching the internet for a way to add potion effects while an item is being held. I have found many results but none really seem to be working. My main issue is that when I get to the adding potion effect it throws errors because I am trying to use a non-static to access an abstract. I tried the #Overide several times but it never seems to work. I still need to register in forge as that is how it updates but adding PlayerEntity does not work when I use #SubscribeEvent
package blitz.weapon.weaponmod;
import net.minecraft.block.Block;
import net.minecraft.block.Blocks;
import net.minecraft.client.MainWindow;
import net.minecraft.client.Minecraft;
import net.minecraft.entity.Entity;
import net.minecraft.entity.LivingEntity;
import net.minecraft.entity.player.PlayerAbilities;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.item.Item;
import net.minecraft.item.ItemGroup;
import net.minecraft.item.ItemStack;
import net.minecraft.potion.EffectInstance;
import net.minecraft.potion.Effects;
import net.minecraft.util.Hand;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.CapabilityDispatcher;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.event.TickEvent;
import net.minecraftforge.event.world.NoteBlockEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.InterModComms;
import net.minecraftforge.fml.RegistryObject;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
import net.minecraftforge.fml.event.lifecycle.InterModEnqueueEvent;
import net.minecraftforge.fml.event.lifecycle.InterModProcessEvent;
import net.minecraftforge.fml.event.server.FMLServerStartingEvent;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.ForgeRegistries;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import javax.annotation.Nullable;
import java.util.Objects;
import java.util.stream.Collectors;
// The value here should match an entry in the META-INF/mods.toml file
#Mod("weaponmod")
public class Weaponmod {
// Directly reference a log4j logger.
private static final Logger LOGGER = LogManager.getLogger();
public static final DeferredRegister<Item> ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS, "weaponmod");
public static final RegistryObject<Item> RAINBOW_SWORD = ITEMS.register("rainbow_sword", () ->
new Item(new Item.Properties()
.group(ItemGroup.COMBAT)
.maxStackSize(1)
.maxDamage(13)
));
public Weaponmod() {
// Register the setup method for modloading
FMLJavaModLoadingContext.get().getModEventBus().addListener(this::setup);
// Register the enqueueIMC method for modloading
FMLJavaModLoadingContext.get().getModEventBus().addListener(this::enqueueIMC);
// Register the processIMC method for modloading
FMLJavaModLoadingContext.get().getModEventBus().addListener(this::processIMC);
// Register the doClientStuff method for modloading
FMLJavaModLoadingContext.get().getModEventBus().addListener(this::doClientStuff);
// Register ourselves for server and other game events we are interested in
MinecraftForge.EVENT_BUS.register(this);
ITEMS.register(FMLJavaModLoadingContext.get().getModEventBus());
}
#SubscribeEvent
public void onPlayerTick(TickEvent.PlayerTickEvent event) {
if (event.side.isServer() && event.phase == TickEvent.Phase.START) {
ItemStack stack = event.player.getHeldItemMainhand();
if (stack != null && stack.getItem() !=null) {
if (stack.getItem().equals("1 rainbow_sword")) {
return;
}
}
}
}
private void setup(final FMLCommonSetupEvent event) {
// some preinit code
LOGGER.info("HELLO FROM PREINIT");
LOGGER.info("DIRT BLOCK >> {}", Blocks.DIRT.getRegistryName());
}
private void doClientStuff(final FMLClientSetupEvent event) {
// do something that can only be done on the client
LOGGER.info("Got game settings {}", event.getMinecraftSupplier().get().gameSettings);
}
private void enqueueIMC(final InterModEnqueueEvent event) {
// some example code to dispatch IMC to another mod
InterModComms.sendTo("weaponmod", "helloworld", () -> {
LOGGER.info("Hello world from the MDK");
return "Hello world";
});
}
private void processIMC(final InterModProcessEvent event) {
// some example code to receive and process InterModComms from other mods
LOGGER.info("Got IMC {}", event.getIMCStream().
map(m -> m.getMessageSupplier().get()).
collect(Collectors.toList()));
}
// You can use SubscribeEvent and let the Event Bus discover methods to call
#SubscribeEvent
public void onServerStarting(FMLServerStartingEvent event) {
// do something when the server starts
LOGGER.info("HELLO from server starting");
}
// You can use EventBusSubscriber to automatically subscribe events on the contained class (this is subscribing to the MOD
// Event bus for receiving Registry Events)
#Mod.EventBusSubscriber(bus = Mod.EventBusSubscriber.Bus.MOD)
public static class RegistryEvents {
#SubscribeEvent
public static void onBlocksRegistry(final RegistryEvent.Register<Block> blockRegistryEvent) {
// register a new block here
LOGGER.info("HELLO from Register Block");
}
}
}
That is my code for basically my whole mod, can anyone give me any pointers? (Sorry for any mistakes this is my first post)

Receive events from AMQP with Axon 4

I am trying to send messages via rabbitmq to an axon4 spring boot based system. The message is received but no events are triggered. I am very sure I am missing an essential part, but up to now I wasn't able to figure it out.
Here the relevant part of my application.yml
axon:
amqp:
exchange: axon.fanout
transaction-mode: publisher_ack
# adding the following lines changed nothing
eventhandling:
processors:
amqpEvents:
source: in.queue
mode: subscribing
spring:
rabbitmq:
username: rabbit
password: rabbit
From the docs I found that I am supposed to create a SpringAMQPMessageSource bean:
import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.axonframework.extensions.amqp.eventhandling.AMQPMessageConverter;
import org.axonframework.extensions.amqp.eventhandling.spring.SpringAMQPMessageSource;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
#Slf4j
#Configuration
public class AxonConfig {
#Bean
SpringAMQPMessageSource inputMessageSource(final AMQPMessageConverter messageConverter) {
return new SpringAMQPMessageSource(messageConverter) {
#RabbitListener(queues = "in.queue")
#Override
public void onMessage(final Message message, final Channel channel) {
log.debug("received external message: {}, channel: {}", message, channel);
super.onMessage(message, channel);
}
};
}
}
If I send a message to the queue from the rabbitmq admin panel I see the log:
AxonConfig : received external message: (Body:'[B#13f7aeef(byte[167])' MessageProperties [headers={}, contentLength=0, receivedDeliveryMode=NON_PERSISTENT, redelivered=false, receivedExchange=, receivedRoutingKey=in.queue, deliveryTag=2, consumerTag=amq.ctag-xi34jwHHA__xjENSteX5Dw, consumerQueue=in.queue]), channel: Cached Rabbit Channel: AMQChannel(amqp://rabbit#127.0.0.1:5672/,1), conn: Proxy#11703cc8 Shared Rabbit Connection: SimpleConnection#581cb879 [delegate=amqp://rabbit#127.0.0.1:5672/, localPort= 58614]
Here the Aggregate that should receive the events:
import lombok.extern.slf4j.Slf4j;
import org.axonframework.commandhandling.CommandHandler;
import org.axonframework.config.ProcessingGroup;
import org.axonframework.eventsourcing.EventSourcingHandler;
import org.axonframework.modelling.command.AggregateIdentifier;
import org.axonframework.spring.stereotype.Aggregate;
import pm.mbo.easyway.api.app.order.commands.ConfirmOrderCommand;
import pm.mbo.easyway.api.app.order.commands.PlaceOrderCommand;
import pm.mbo.easyway.api.app.order.commands.ShipOrderCommand;
import pm.mbo.easyway.api.app.order.events.OrderConfirmedEvent;
import pm.mbo.easyway.api.app.order.events.OrderPlacedEvent;
import pm.mbo.easyway.api.app.order.events.OrderShippedEvent;
import static org.axonframework.modelling.command.AggregateLifecycle.apply;
#ProcessingGroup("amqpEvents")
#Slf4j
#Aggregate
public class OrderAggregate {
#AggregateIdentifier
private String orderId;
private boolean orderConfirmed;
#CommandHandler
public OrderAggregate(final PlaceOrderCommand command) {
log.debug("command: {}", command);
apply(new OrderPlacedEvent(command.getOrderId(), command.getProduct()));
}
#CommandHandler
public void handle(final ConfirmOrderCommand command) {
log.debug("command: {}", command);
apply(new OrderConfirmedEvent(orderId));
}
#CommandHandler
public void handle(final ShipOrderCommand command) {
log.debug("command: {}", command);
if (!orderConfirmed) {
throw new IllegalStateException("Cannot ship an order which has not been confirmed yet.");
}
apply(new OrderShippedEvent(orderId));
}
#EventSourcingHandler
public void on(final OrderPlacedEvent event) {
log.debug("event: {}", event);
this.orderId = event.getOrderId();
orderConfirmed = false;
}
#EventSourcingHandler
public void on(final OrderConfirmedEvent event) {
log.debug("event: {}", event);
orderConfirmed = true;
}
#EventSourcingHandler
public void on(final OrderShippedEvent event) {
log.debug("event: {}", event);
orderConfirmed = true;
}
protected OrderAggregate() {
}
}
So the problem is that the messages are received by the system but no events are triggered. The content of the messages seem to be irrelevant. Whatever I send to the queue I only get a log message from my onMessage method.
JavaDoc of SpringAMQPMessageSource says this:
/**
* MessageListener implementation that deserializes incoming messages and forwards them to one or more event processors.
* <p>
* The SpringAMQPMessageSource must be registered with a Spring MessageListenerContainer and forwards each message
* to all subscribed processors.
* <p>
* Note that the Processors must be subscribed before the MessageListenerContainer is started. Otherwise, messages will
* be consumed from the AMQP Queue without any processor processing them.
*
* #author Allard Buijze
* #since 3.0
*/
But up to now I couldn't find out where or how to register it.
The axon.eventhandling entries in my config and #ProcessingGroup("amqpEvents") in my Aggregate are already from testing. But having those entries in or not made no difference at all. Also tried without the mode=subscribing.
Exact versions: Spring Boot 2.1.4, Axon 4.1.1, axon-amqp-spring-boot-autoconfigure 4.1
Any help or hints highly appreciated.
Update 23.04.19:
I tried to write my own class like this:
import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.axonframework.common.Registration;
import org.axonframework.eventhandling.EventMessage;
import org.axonframework.extensions.amqp.eventhandling.AMQPMessageConverter;
import org.axonframework.messaging.SubscribableMessageSource;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.listener.api.ChannelAwareMessageListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.Consumer;
#Slf4j
#Component
public class RabbitMQSpringAMQPMessageSource implements ChannelAwareMessageListener, SubscribableMessageSource<EventMessage<?>> {
private final List<Consumer<List<? extends EventMessage<?>>>> eventProcessors = new CopyOnWriteArrayList<>();
private final AMQPMessageConverter messageConverter;
#Autowired
public RabbitMQSpringAMQPMessageSource(final AMQPMessageConverter messageConverter) {
this.messageConverter = messageConverter;
}
#Override
public Registration subscribe(final Consumer<List<? extends EventMessage<?>>> messageProcessor) {
eventProcessors.add(messageProcessor);
log.debug("subscribe to: {}", messageProcessor);
return () -> eventProcessors.remove(messageProcessor);
}
#RabbitListener(queues = "${application.queues.in}")
#Override
public void onMessage(final Message message, final Channel channel) {
log.debug("received external message: {}, channel: {}", message, channel);
log.debug("eventProcessors: {}", eventProcessors);
if (!eventProcessors.isEmpty()) {
messageConverter.readAMQPMessage(message.getBody(), message.getMessageProperties().getHeaders())
.ifPresent(event -> eventProcessors.forEach(
ep -> ep.accept(Collections.singletonList(event))
));
}
}
}
The result is the same and the log now proofs that the eventProcessors are just empty.
eventProcessors: []
So the question is, how to register the event processors correctly. Is there a way how to do that properly with spring?
Update2:
Also no luck with this:
#Slf4j
#Component("rabbitMQSpringAMQPMessageSource")
public class RabbitMQSpringAMQPMessageSource extends SpringAMQPMessageSource {
#Autowired
public RabbitMQSpringAMQPMessageSource(final AMQPMessageConverter messageConverter) {
super(messageConverter);
}
#RabbitListener(queues = "${application.queues.in}")
#Override
public void onMessage(final Message message, final Channel channel) {
try {
final var eventProcessorsField = this.getClass().getSuperclass().getDeclaredField("eventProcessors");
eventProcessorsField.setAccessible(true);
final var eventProcessors = (List<Consumer<List<? extends EventMessage<?>>>>) eventProcessorsField.get(this);
log.debug("eventProcessors: {}", eventProcessors);
} catch (NoSuchFieldException | IllegalAccessException e) {
e.printStackTrace();
}
log.debug("received message: message={}, channel={}", message, channel);
super.onMessage(message, channel);
}
}
axon:
eventhandling:
processors:
amqpEvents:
source: rabbitMQSpringAMQPMessageSource
mode: SUBSCRIBING
Registering it programmatically in addition to above also didn't help:
#Autowired
void configure(EventProcessingModule epm,
RabbitMQSpringAMQPMessageSource rabbitMessageSource) {
epm.registerSubscribingEventProcessor("rabbitMQSpringAMQPMessageSource", c -> rabbitMessageSource);
epm.assignProcessingGroup("amqpEvents", "rabbitMQSpringAMQPMessageSource");// this line also made no difference
}
Of course #ProcessingGroup("amqpEvents") is in place in my class that contains the #EventSourcingHandler annotated methods.
Update 25.4.19:
see accepted answer from Allard. Thanks a lot pointing me at the mistake I made: I missed that EventSourcingHandler don't receive messages from outside. This is for projections. Not for distributing Aggregates! ups
Here the config/classes that are receiving events from rabbitmq now:
axon:
eventhandling:
processors:
amqpEvents:
source: rabbitMQSpringAMQPMessageSource
mode: SUBSCRIBING
import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.axonframework.extensions.amqp.eventhandling.AMQPMessageConverter;
import org.axonframework.extensions.amqp.eventhandling.spring.SpringAMQPMessageSource;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
#Slf4j
#Component("rabbitMQSpringAMQPMessageSource")
public class RabbitMQSpringAMQPMessageSource extends SpringAMQPMessageSource {
#Autowired
public RabbitMQSpringAMQPMessageSource(final AMQPMessageConverter messageConverter) {
super(messageConverter);
}
#RabbitListener(queues = "${application.queues.in}")
#Override
public void onMessage(final Message message, final Channel channel) {
log.debug("received message: message={}, channel={}", message, channel);
super.onMessage(message, channel);
}
}
import lombok.extern.slf4j.Slf4j;
import org.axonframework.config.ProcessingGroup;
import org.axonframework.eventhandling.EventHandler;
import org.axonframework.queryhandling.QueryHandler;
import org.springframework.stereotype.Service;
import pm.mbo.easyway.api.app.order.events.OrderConfirmedEvent;
import pm.mbo.easyway.api.app.order.events.OrderPlacedEvent;
import pm.mbo.easyway.api.app.order.events.OrderShippedEvent;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
#Slf4j
#ProcessingGroup("amqpEvents")
#Service
public class OrderedProductsEventHandler {
private final Map<String, OrderedProduct> orderedProducts = new HashMap<>();
#EventHandler
public void on(OrderPlacedEvent event) {
log.debug("event: {}", event);
String orderId = event.getOrderId();
orderedProducts.put(orderId, new OrderedProduct(orderId, event.getProduct()));
}
#EventHandler
public void on(OrderConfirmedEvent event) {
log.debug("event: {}", event);
orderedProducts.computeIfPresent(event.getOrderId(), (orderId, orderedProduct) -> {
orderedProduct.setOrderConfirmed();
return orderedProduct;
});
}
#EventHandler
public void on(OrderShippedEvent event) {
log.debug("event: {}", event);
orderedProducts.computeIfPresent(event.getOrderId(), (orderId, orderedProduct) -> {
orderedProduct.setOrderShipped();
return orderedProduct;
});
}
#QueryHandler
public List<OrderedProduct> handle(FindAllOrderedProductsQuery query) {
log.debug("query: {}", query);
return new ArrayList<>(orderedProducts.values());
}
}
I removed the #ProcessingGroup from my Aggregate of course.
My logs:
RabbitMQSpringAMQPMessageSource : received message: ...
OrderedProductsEventHandler : event: OrderShippedEvent...

In Axon, Aggregates do not receive events from "outside". The Event Handlers inside Aggregates (more specifically, they are EventSourcingHandlers) only handle events that have been published by that same aggregate instance, so that it can reconstruct its prior state.
It is only external event handlers, for example the ones that update projections, that will receive events from external sources.
For that to work, your application.yml should mention the bean name as a processors' source instead of the queue name. So in your first example:
eventhandling:
processors:
amqpEvents:
source: in.queue
mode: subscribing
Should become:
eventhandling:
processors:
amqpEvents:
source: inputMessageSource
mode: subscribing
But again, this only works for event handlers defined on components, not on Aggregates.

Use Actors to send data to Akka websockets

I am using Akka websockets to push data to some client.
This is what I have done so far:
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.TimeUnit;
import akka.NotUsed;
import akka.actor.ActorSystem;
import akka.http.javadsl.ConnectHttp;
import akka.http.javadsl.Http;
import akka.http.javadsl.ServerBinding;
import akka.http.javadsl.model.HttpRequest;
import akka.http.javadsl.model.HttpResponse;
import akka.http.javadsl.model.ws.Message;
import akka.http.javadsl.model.ws.WebSocket;
import akka.japi.Function;
import akka.stream.ActorMaterializer;
import akka.stream.Materializer;
import akka.stream.javadsl.Flow;
import akka.stream.javadsl.Sink;
import akka.stream.javadsl.Source;
public class Server {
public static HttpResponse handleRequest(HttpRequest request) {
System.out.println("Handling request to " + request.getUri());
if (request.getUri().path().equals("/greeter")) {
final Flow<Message, Message, NotUsed> greeterFlow = greeterHello();
return WebSocket.handleWebSocketRequestWith(request, greeterFlow);
} else {
return HttpResponse.create().withStatus(404);
}
}
public static void main(String[] args) throws Exception {
ActorSystem system = ActorSystem.create();
try {
final Materializer materializer = ActorMaterializer.create(system);
final Function<HttpRequest, HttpResponse> handler = request -> handleRequest(request);
CompletionStage<ServerBinding> serverBindingFuture = Http.get(system).bindAndHandleSync(handler,
ConnectHttp.toHost("localhost", 8080), materializer);
// will throw if binding fails
serverBindingFuture.toCompletableFuture().get(1, TimeUnit.SECONDS);
System.out.println("Press ENTER to stop.");
new BufferedReader(new InputStreamReader(System.in)).readLine();
} finally {
system.terminate();
}
}
public static Flow<Message, Message, NotUsed> greeterHello() {
return Flow.fromSinkAndSource(Sink.ignore(),
Source.single(new akka.http.scaladsl.model.ws.TextMessage.Strict("Hello!")));
}
}
At the client side, I am successfully receiving a 'Hello!' message.
However, now I want to send data dynamically (preferably from an Actor), something like this:
import akka.actor.ActorRef;
import akka.actor.UntypedActor;
public class PushActor extends UntypedActor {
#Override
public void onReceive(Object message) {
if (message instanceof String) {
String statusChangeMessage = (String) message;
// How to push this message to a socket ??
} else {
System.out.println(String.format("'%s':\nReceived unknown message '%s'!", selfActorPath, message));
}
}
}
I am unable to find any example regarding this online.
The following is the software stack being used:
Java 1.8
akka-http 10.0.10

One - not necessarily very elegant - way of doing this is to use Source.actorRef and send the materialized actor somewhere (maybe a router actor?) depending on your requirements.
public static Flow<Message, Message, NotUsed> greeterHello() {
return Flow.fromSinkAndSourceMat(Sink.ignore(),
Source.actorRef(100, OverflowStrategy.fail()),
Keep.right()).mapMaterializedValue( /* send your actorRef to a router? */);
}
Whoever receives the actorRefs of the connected clients must be responsible for routing messages to them.

Send A Return Message To The Sender And Simply Print It Out

I´m very new to Akka. I have created a simple Hello World App using it.
The App is very simple, it sends a message to my simple Actor. What I want is to send a message back to the first sender of the message. I can´t get the return message. How can someone do that? Do the client have to implement a onReceive method? I have tried to comment in the code.
import akka.actor.UntypedActor;
public class HelloActor extends UntypedActor {
#Override
public void onReceive(Object o) throws Exception {
if(o instanceof String){
String message = (String)o;
System.out.println(message);
// how to get this response ?
getSender().tell("World",getSelf());
}
}
}
The Client
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
public class Client{
public static void main(String[] args){
ActorSystem actorSystem = ActorSystem.create("HelloWorldSystem");
ActorRef listener = actorSystem.actorOf(new Props(HelloActor.class), "listener");
// sending is OK but how to get the response?
listener.tell("Hello");
}
}

The correct answer is to use a Future:
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
import akka.dispatch.*;
import akka.dispatch.Future;
import akka.pattern.Patterns;
import akka.util.Duration;
import akka.util.Timeout;
public class Client{
public static void main(String[] args){
ActorSystem actorSystem = ActorSystem.create("HelloWorldSystem");
ActorRef listener = actorSystem.actorOf(new Props(HelloActor.class), "listener");
Timeout timeout = new Timeout(Duration.create(5, "seconds"));
Future<Object> future = Patterns.ask(listener, "Hello", timeout);
try{
String result = (String) Await.result(future, timeout.duration());
System.out.println(result);
}catch (Exception e){
e.printStackTrace();
}
}
}

Akka future with Play Framework

I am trying to use Akka future with play framework to connect to a remote akka system
. After running the system the akka future gives me a warning that one argument is left.
the code are below :
this is the [lay controller code:
p
ackage controllers;
import com.typesafe.config.ConfigFactory;
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
import play.*;
import play.mvc.*;
import views.html.*;
public class Application extends Controller {
public static Result index() throws InterruptedException {
System.out.println(" Local Node Called0");
ActorSystem csystem = ActorSystem.create("Application", ConfigFactory.load().getConfig("LocalNode"));
ActorRef localNode = csystem.actorOf(new Props(LocalNode.class));
System.out.println(" Local Node Called1");
localNode.tell("Hello");
System.out.println(" Local Node Called2");
Thread.sleep(5000);
csystem.shutdown();
return ok(index.render("I am OK"));
}
}
this is the play framework local actor node
package controllers;
import akka.actor.;
import akka.dispatch.Await;
import akka.dispatch.Future;
import akka.event.Logging;
import akka.event.LoggingAdapter;
import akka.util.Duration;
import akka.util.Timeout;
import akka.pattern.;
public class LocalNode extends UntypedActor {
LoggingAdapter log = Logging.getLogger(getContext().system(), this);
Timeout timeout = new Timeout(Duration.parse("20 seconds"));
ActorRef masterActor;
public void preStart()
{
/* Get reference to Master Node*/
masterActor =
getContext().actorFor("akka://MasterNode#127.0.0.1:2552/user/masterActor");
}
#Override
public void onReceive(Object message) throws Exception {
System.out.println(" Future called ");
Future<Object> future = Patterns.ask(masterActor , message.toString(), timeout);
String result = (String) Await.result(future, timeout.duration());
log.info("Messagefrom Server", result.toString());
}
}
this is the remote akka system master nide
package Rubine_Cluster;
import com.typesafe.config.ConfigFactory;
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
import akka.actor.UntypedActor;
import akka.kernel.Bootable;
/**
* Hello world!
*
*/
public class MasterNode implements Bootable
{
final ActorSystem system;
public MasterNode() {
system = ActorSystem.create("MasterNode", ConfigFactory.load()
.getConfig("masterNode"));
ActorRef masterActor = system.actorOf(new Props(MasterActor.class),"masterActor");
System.out.println(" Master Node is called ");
}
public void startup() {
}
public void shutdown() {
system.shutdown();
}
}
this is the akka remote system MasterActor
package Rubine_Cluster;
import akka.actor.*;
public class MasterActor extends UntypedActor {
#Override
public void onReceive(Object message) throws Exception {
if (message instanceof String) {
// Get reference to the message sender and reply back
getSender().tell(message + " got something");
}
}
}
this is the message from the play framewrok
[INFO] [09/30/2012 16:47:25.669] [Application-akka.actor.default-dispatcher-1] [
akka://Application/user/$a] Messagefrom Server WARNING arguments left: 1
help is needed cos I am suppose to meet the assignment deadline
thanks to all

The "arguments left: 1" warning is due to the following line:
log.info("Messagefrom Server", result.toString())
You're passing unused params to the logger. It should be this instead:
log.info("Messagefrom Server {}", result.toString())

Try to give a name to your actor in Play:
ActorRef localNode = csystem.actorOf(new Props(LocalNode.class), "localNode");
And also note that if you need to access the Akka system from Play, it is better to use:
ActorSystem csystem = Akka.system();
instead of:
ActorSystem csystem = ActorSystem.create("Application", ConfigFactory.load().getConfig("LocalNode"));