Question

It appears that the Hibernate NotEmpty annotation does not result in an error for strings filled with whitespace (" "). Only works for nulls or empty strings (ie: new String()). Is there a workaround/fix for this?

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Solution

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.

OTHER TIPS

@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.

@NotBlank is the way to test string lengths with an implicit trim call.

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