Some client TransactionalMap operations deserializes on server side

[sertugkaya]

While IMap#values() does not do so. This causes serialization exceptions on a client-member setup when members doesn't have the serialization info (ex: in case of using Portables).

[sertugkaya]

Update: Transactional read operations also fail for objects that are written before transaction begins.

Reproducer (Foo being a Portable object):

import com.hazelcast.client.HazelcastClient;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import com.hazelcast.core.TransactionalMap;
import com.hazelcast.transaction.TransactionContext;

/**
 * Created by sertugkaya on 19/07/16.
 */
public class DummyClient {
    public static void main(String[] args)
            throws InterruptedException {
        HazelcastInstance client = HazelcastClient.newHazelcastClient();

        IMap<Object, Object> map = client.getMap("map");

        Foo foo = new Foo();
        foo.setFoo("foo");
        map.put(1, foo);

        TransactionContext context = client.newTransactionContext();
        context.beginTransaction();
        TransactionalMap<Object, Object> map2 = context.getMap("map");
        try {
            System.out.println("foo1: " + map2.get(1));
            context.commitTransaction();
        } catch (Throwable t) {
            context.rollbackTransaction();
            t.printStackTrace();
        }
    }
}