There are numerous articles describing charset problems when using Tomcat to run Grails applications that are supposed to accept UTF-8 characters (e.g. German umlauts äöüÄÖÜß). Most of them don’t mention a subtle cause that may jeopardize all your efforts to properly interpret UTF-8 form input. And fiddling around with Tomcat’s defaults was not an option for me, as the same Tomcat instance is to run other non-Grails legacy applications that rely on ISO-8859-1 being the default character set.
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