Improve Exception Logging in ExceptionResolversExceptionHandler

[alexbudarov]

As I understand, currently developer has to set this application settting:

logging.level.org.springframework.graphql.execution.ExceptionResolversExceptionHandler = debug

if he/she wants to log unexpected exceptions from annotated handler methods.

By default (e.g. in spring-graphql sample apps) exceptions are not written to log .
Is it how it's intended to be? I would expect unexpected application errors to be written to log by default.

[rstoyanchev]

Thanks for the question, this can be improved as follows.

If the exception is resolved by a DataFetcherExceptionResolver it is logged with a stack trace at DEBUG level. If the exception is unresolved, in which case default handling as as internal error applies, then it is logged with a stack trace at ERROR level.

I think this is what you expect as well but if not please comment.