GWT+GAE TodoMVCCommandDeserializerImpl.java
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package com.todomvc.client.command;

import java.util.logging.Logger;

import javax.inject.Inject;

import com.google.gwt.user.client.rpc.SerializationStreamFactory;
import com.google.gwt.user.client.rpc.SerializationStreamReader;
import com.todomvc.shared.command.Command;
import com.todomvc.shared.command.CommandSerialization;
import com.todomvc.shared.command.CommandSerialization.CommandDeserializer;
import com.todomvc.shared.service.CommandServiceAsync;
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Implementation of CommandDeserializer that uses GWT RPC serialization mechanism.

It's the client counterpart of the server-side CommandSerializer.

public class CommandDeserializerImpl implements CommandSerialization.CommandDeserializer {

    private static Logger logger = Logger.getLogger(CommandDeserializerImpl.class.getName());

    private final SerializationStreamFactory serializationStreamFactory;

    @Inject
    public CommandDeserializerImpl(CommandServiceAsync commandService) {
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This looks like it shouldn't work, but the asynchronous implementation of CommandService that GWT generates implements SerializationStreamFactory. Tricky part.

      serializationStreamFactory = (SerializationStreamFactory) commandService;
    }
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De-serializes a Command object. 

    @Override
    public Command<?> read(String s) throws CommandSerialization.SerializationException {
      try {
        SerializationStreamReader reader = serializationStreamFactory.createStreamReader(s);
        return (Command<?>) reader.readObject();
      } catch (com.google.gwt.user.client.rpc.SerializationException e) {
        logger.severe("unable to deserialize command: " + s);
        throw new CommandSerialization.SerializationException(e);
      }
    }

}