email retrieved from userProfile is null (spring social) -


why app retrieve userprofile email null ? use spring social , configuration same configuration in spring_social_samples project created craig walls 

connection<?> connection = providersigninutils.getconnection(request);           if (connection != null) {         userprofile = connection.fetchuserprofile();                  }

and up.getemail() null except when using email facebook developer account.

thanks help

this how created button , worked fine:

   <a href="${pagecontext.request.contextpath}/auth/facebook?scope=email"><button class="btn btn-facebook"><i class="icon-facebook"></i> | <spring:message code="label.facebook.sign.in.button"/></button></a>

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