I finally fixed it. This error "Object with id "" is managed by a different Object Manager" broke my app. I turned on transactions and now everything works fine. If somebody need the sample app based on Spring + Tiles + JSR-303 validation you can find it here (http://s- sandbox.blogspot.com/2010/10/gae-spring-3-tiles-jsr-303.html). This article is on Russian but there is a source code in the end if the page.
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