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The omnifaces.ToUpperCaseConverter is intented to convert submitted String values to upper case based on current Locale. Additionally, it trims any whitespace from the submitted value. This is useful for among others zip code inputs.
This converter does by design no conversion in getAsString().
Usage
This converter is available by converter ID omnifaces.ToUpperCaseConverter. Just specify it in the converter attribute of the component referring the String property. For example:
<h:inputText value="#{bean.zipCode}" converter="omnifaces.ToUpperCaseConverter" />Documentation & Sources