Annotations @Provides and @Singleton do not work together

[groov1kk]

Hello

Annotations @Provides and @Singleton do not work together if I try to return class type instead of interface:

  @Provides @Singleton
  InMemoryTransactionLog provideTransactionLog() {
    ...
  }

I look through the implementation and noticed, that method findScopeAnnotation(Errors, Class) just checks whether the provided class was marked by @Singleton annotation. The problem is that I can't mark by this annotation third party classes.

[GedMarc]

That it by design,
Singletons must be registered in a binder, as either a plain or eager singleton,
Specifying @provides does not give you this definition that guice provides above other D.Is

Adding provides and registering a bind In a module will make it a lazy singleton, using .asEagerSingleton for the other.....

[GedMarc]

Guice is modular in design, third party libraries either bind manually or use one's that are strictly DI compliant, CDI third party does not match DI

[lobaorn]

Hey @groov1kk @GedMarc , letting you know since you may be targeting Guice 7.0.0, about the new Micronaut Guice project, that depending on your usecase could be a useful replacement: micronaut-projects/micronaut-guice#9