GWT google crawler error undefined.cache.js

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I have a GWT application http://islamart.tn which fails on google crawling : The 'fetch as google' feature fails with a 'partial' status saying that it can't find undefined.cache.js After some research, I found that this js is the app js when the user.agent is not recognized I therefore changed my UserAgentPropertyGenerator.UserAgent enum value for gecko to recgnize google bot: gecko1_8("return (ua.indexOf('Googlebot') || ua.indexOf('gecko') != -1 || docMode >= 11);"); In my core GWT module I naturally added the line : <property-provider name="user.agent" generator="fr.onevu.vume.client.common.UserAgentPropertyGenerator"/> I installed 'Chrome UA spoofer" to emulate the Googlebot user.agent request, and what happened is that now I have a warning at startup saying that the runtime value safari is different than the compile time gecko_18 I still see some checking runtime code in the generated js {$stackDepth_0=stackIndex_0-1;return 'gecko1_8'}$stackDepth_0=stackIndex_0-1;return 'unknown'} but those files are very large, and I don't know from which classes they are generated. Additionally, I had to fall back to the version 2.6.1 since compilation with 2.8.0RC2 and 2.7.0 don't finish the job (for some reasons I don't have the time to investigate now) Any ideas please?... I need an answer to one of these questions : How to personalize the runtime user agent check generated code ? How to make googlebot use the gecko_18 version of my app ?  p.s : I posted this message on http://stackoverflow.com/questions/39796166/gwt-application-crawler-error-undefined-cache-js

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