Diagnostics

goboot reports problems as source-positioned diagnostics with stable codes — never panics. Warnings are advisory; -strict promotes them to errors.

Prefix	Area
GOBANN*	annotation syntax / schema (unknown annotation, wrong target, bad argument, non-repeatable)
GOBDI*	dependency injection (missing dependency, ambiguous dependency, cycle, invalid constructor)
GOBHTTP*	HTTP (invalid handler signature, duplicate route, invalid @ExceptionHandler)
GOBREP*	repositories (invalid query signature, unknown SQL parameter, missing @Query/@Exec)
GOBCFG* / GOBLIF*	configuration / lifecycle
GOBPRX*	service proxies (concrete injection of a proxied service, missing/unimplemented interface)
GOBSCH*	scheduling
GOBPLG*	plugins

Common ones

Code	Meaning	Fix
GOBANN002	unknown annotation (warning)	typo, or register it via a plugin AnnotationProvider
GOBANN003	annotation on the wrong target	move it to a valid declaration kind
GOBDI001	missing dependency	provide a component/constructor for the type
GOBDI (ambiguous)	more than one candidate	add @Primary or @Named
GOBDI (cycle)	dependency cycle	break the cycle (introduce an interface / rethink ownership)
GOBHTTP004	duplicate route	two handlers map to the same method + path
GOBPRX001	concrete injection of a proxied service	inject the interface it declares via implements=
GOBREP002	unknown SQL parameter	a :name has no matching method argument

Run goboot validate ./... to see all diagnostics without writing files.