What is the advantage of the MVP pattern (GWT)?

I have to disagree, MVP makes code way less complex, especially in case of GWT. If you plan on medium to large size GWT project then MVP architecture is your primary option. I suggest to look at both GWT MVP (by Google) and at gwt-platform (suggested by KennethJ).

There are other implementations as well.

If you mean advantage compared to standard MVC pattern (the common pattern for UI development), then yes, I guess that's the main reason for this pattern.

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