How to parse Character

[XYZboom]

expression jsonMapper.readerFor(Character.class).readValue("\t") throws com.fasterxml.jackson.databind.exc.MismatchedInputException: No content to map due to end-of-input
at [Source: (String)"\u0009"; line: 1, column: 0]

[cowtowncoder]

Yes? You passing a "document" that contains of a tab character, not JSON. It is invalid.
What else should happen?

To send a character as value, it needs to be sent as a JSON String, or perhaps JSON Number.
There is no distinct character data type.