Replace your @NotEmpty with a @Pattern annotation that includes a regex expression that will fail on strings that are pure whitespace or empty (you may be able to include both @NotEmpty and @Pattern and simplify the regex that way). Or write a custom validator as described here .
NotEmpty is used to check size rather than contents and applies to Collections as well as Strings. The functionality you're looking for is provided in @NotBlank which is specific to Strings and ignores trailing whitespace.
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