Comet Implementation for GWT

Does anyone know another comet implementation for GWT, i'm using this one http://code.google.com/p/gwt-comet/ but getting error with firefox and gwt. I've listes the error at https://stackoverflow.com/questions/开发者_开发知识库4693964/gwt-comet-error

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You can use Atmosphere Framework: https://github.com/Atmosphere/atmosphere

They support GWT