Open Multiples tabs

“java.lang.IllegalStateException: UI id has already been defined” when open new tab on integrate Vaadin with JEE6. Why?
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Because of @SessionScoped - it refers to an HTTP session which can have multiple UIs.
You try to reuse the same instance of the UI for all tabs, which won’t work.

Hi.

I tried to reproduce this wiki “https://vaadin.com/wiki/-/wiki/Main/JEE6+integration+with+Vaadin+7”.
I removed the @SessionScope, but occurred the same error.