Unhandled exception mapping for javax.validation.ValidationException

[jsenko]

Examples from logs:

• Returning an HTTP 5xx error code because: javax.validation.ValidationException: invalid orderBy
• Returning an HTTP 5xx error code because: javax.validation.ValidationException: Invalid search query. Currently search supports only single key=value strings pair
• Returning an HTTP 5xx error code because: java.lang.IllegalArgumentException: fromKey > toKey

[wtrocki]

For simplicity I would typically map them to the same error code - invalid user input %field
We do not need multiple error codes unless we want to return meaning - Value to small etc.

[famarting]

related to this #181 , no?