Introduce AnnotationConfigGenericWebApplicationContext

[bytewright]

A copy of Spring-boot 2.1.8 AnnotationConfigServletWebServerApplicationContext,
except that it does not use its own WebServer (other super class).

Also See AnnotationConfigApplicationContext (Same as this but uses
GenericApplicationContext instead of GenericWebApplicationContext)

In contrast to org.springframework.web.context.support.AnnotationConfigWebApplicationContext,
this class uses the GenericWebApplicationContext, which allows registering beans using a Supplier
#registerBean(Class, Supplier, BeanDefinitionCustomizer...)

[pivotal-issuemaster]

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[bytewright]

I noticed this flavor of WebApplicationContext was missing, or at least I couldn't find anything like it.
Since I like working with Spring I thought: well why not just create a pull request.

[rstoyanchev]

I've edited your comment to improve the formatting. You might want to check out this Mastering Markdown guide for future reference.

In particular please keep in mind that @ is a mention and generates notifications so please surround those with backquotes when it is a Java annotation.

[sbrannen]

Hi @bytewright,

Thanks for submitting your first PR to the Spring Framework, and sorry for taking so long to get back to you.

You make a good point: it's not readily apparent how one can make use of #registerBean(Class, Supplier, BeanDefinitionCustomizer...) with a WebApplicationContext that supports annotated classes.

However, it turns out that it's relatively easy to achieve as demonstrated in the following example.

GenericWebApplicationContext context = new GenericWebApplicationContext();
AnnotatedBeanDefinitionReader annotatedBeanDefinitionReader = new AnnotatedBeanDefinitionReader(context);

context.registerBean("helloSpring", String.class, () -> "Hello, Spring!");
annotatedBeanDefinitionReader.register(UserService.class, UserRepository.class);

By using GenericWebApplicationContext, you get access to the registerBean(...) variants that accept a Supplier.

By using AnnotatedBeanDefinitionReader, you can register annotated classes (@Service, @Controller, etc.) with the GenericWebApplicationContext.

After reviewing your proposal, the team has decided it does not wish to introduce AnnotationConfigGenericWebApplicationContext since the necessary building blocks are already available as demonstrated above.

In light of that, I am closing this PR.

[sbrannen]

See also:

• Document how to register annotated classes with a GenericWebApplicationContext #27778