RestOauthController fails to encode errors because of issue with DefaultCallbackErrorHandler

[snimavat]

RestOauthController Would fail with below error when it encounters UserNotFoundException

java.lang.Integer.encodeAsURL() is applicable

Because Default call back error handler puts integer value in params as params.error = FORBIDDEN.value() and we cant do intValue.encodeAsUrl

In short, if DefaultCallbackErrorHandler.groovy puts any integer values in returned map, it would cause error at this line this line

We have Custom Oauth user details service which throws UserNotFoundException if the oauth user does not exist in our database.

[snimavat]

Looks like codecs broken, encodeAsUrl fails on any object. None of the codecs works.
No idea why,

I had to put @import([CodecsConfiguration]) on Application.groovy to get codecs working.
All good after that.