Spring 7 - XML configuration no longer supported

[jdaugherty]

Issue description

Spring has stated that xml driven configuration (at least for MVC) is not going to be supported in Spring Framework 7 (it will be there, but Spring won't support it). However, they're separately adding a programmatic way to add beans. We'll likely need to rework the bean builder as a result since it's ultimately backed by xml.

https://github.com/spring-projects/spring-framework/wiki/Spring-Framework-7.0-Release-Notes#deprecations

[jdaugherty]

FYI: the BeanRegistrar interface is how Spring decided to implement this, which has this sole method: register(BeanRegistry registry, Environment environment)

Documentation for registry is here: https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/beans/factory/BeanRegistry.html

Someone put together an example repository here: https://github.com/danvega/sb4-bean-registrar for usage.

[jdaugherty]

Desired approach:

1. mark the dsl deprecated
2. update the docs to indicate the dsl is removed / replace with the BeanRegistrar examples
3. inject the BeanRegistrar where we wire beans today
4. Remove the bean dsl in Grails 9