RequestFactory 2.4: save entities with multiple sub entities, can only get the first one at server side.

I'm using GWT requestFactory to save an entity, the code is rather simple: i want to create a Blog entity with several Tags, here is my code:

client side:

         BlogRequest blogRequest = factory.blogRequest();

        BlogProxy  instance  = blogRequest.create(  BlogProxy .class );

        instance.setName( "blog name");

        instance.setNote( "mynote2" );

        instance.setTags( base.createTagProxies( blogRequest, tag ) );

        blogRequest.save( instance ).fire(...);

    public Set<TagProxy> createTagProxies( BlogRequest request, String... tagNames )

    {

        Set<TagProxy> tagproxies = new HashSet<TagProxy>();

        for( String tagName : tagNames )

        {

            TagProxy proxy = request.create( TagProxy.class );

            proxy.setName( tagName );

            tagproxies.add( proxy );

        }

        return  tagproxies  ;

    }

for example i create a blog with "Tag1" and "Tag2" in a Set, however after the request send to server side, at Blog#setTags(Set<Tag> tags) method there is only one tag in the parameter set, which is "Tag1", "Tag2" is just missing.

Could anybody help with this issue? Thanks in advance.

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