GWT+GAE TodoMVCCommandSerializer.java
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package com.todomvc.server.command;

import java.lang.reflect.Method;

import com.todomvc.server.GwtRpcSerializer;
import com.todomvc.shared.command.Command;
import com.todomvc.shared.command.CommandSerialization;
import com.todomvc.shared.service.CommandService;
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Helper class to serialize commands in the GWT RPC format.

GWT RPC has built-in support for serialization. It's used for moving objects between client and server when they communicate through RemoteService's.

But we can extend such use beyond RemoteService's. In this TodoMVC we re-use GWT RPC serialization for serializing Command's the server sends to the clients through the Channel API.

public class CommandSerializer implements CommandSerialization.Serializer {

    private final GwtRpcSerializer gwtRpcSerializer;
    private final Method dummyMethod;

    public CommandSerializer() throws Exception {
        gwtRpcSerializer = new GwtRpcSerializer();
        dummyMethod = getDummyMethod();
    }

    @Override
    public String serializeCommand(Command<?> command) {
        return gwtRpcSerializer.serialize(command, dummyMethod);
    }
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Returns the service method that is declared solely to force GWT into serializing Command objects for us.

    private static Method getDummyMethod() {
        try {
            return CommandService.class.getDeclaredMethod("dummyCommand");
        } catch (NoSuchMethodException e) {
            throw new RuntimeException("Unable to find the dummy RPC method.");
        }
    }
}