Enforce nullability at deser time

[dinomite]

Fixes issue #373 by throwing NullInputException if a null value is to be deserialized into a non-null field.

[dinomite]

@rafalbednarczuk Have you signed the CLA? If not, would you fill it out and email a scan/photo of the result to info at fasterxml dot com?

https://github.com/FasterXML/jackson/blob/master/contributor-agreement.pdf

[dinomite]

@viartemev @cowtowncoder What do you think of this new exception type?

[dinomite]

@viartemev Do you think adding this new exception type make sense? https://github.com/FasterXML/jackson-module-kotlin/pull/405/files#diff-f369947c6a2c8905a906e96bae39fef763c95f5b43aee145b9120319863a1487R24

class NullInputException(msg: String) : MismatchedInputException(null, msg)

[dinomite]

@rafalbednarczuk Have you submitted a CLA to Fasterxml?

[k163377]

@rafalbednarczuk cc: @cowtowncoder
I discovered this PR while working on solving the problem.
Could you please submit a CLA?

This will allow us to post your name in the release notes, etc.
Also, if you do not submit a CLA, I will not be able to confirm whether or not there is a legal issue, which would effectively make it impossible to implement this feature.

[cowtowncoder]

I don't think we have CLA from the contributor fwtw.