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If you posted an SSCCE along with the full stack trace, I'm sure somebody would be happy to help you.

Which part is giving you trouble? I suggest building a standalone program separate from your main code, that way you can work with the JTextField by itself, then set that JTextField as a JSpinner's...

It's not complicated, that's the thing. Create a JTextField that behaves how you want, then set it as the editor using the JSpinner.setEditor() function.

When posting code, please use the highlight tags. Unformatted code is very hard to read.

You're going to have to set up some custom listeners or create a custom editor that does what you want.