GH-3828: Initial Spring AOT support

[artembilan]

Fixes https://github.com/spring-projects/spring-integration/issues/3828

• Provide an infrastructure based on a new Spring AOT engine in the latest Spring Framework
• Introduce RuntimeHintsRegistrar impls into modules which require some reflection, resources or proxies and serialization available in the native image
• Mark some framework method with the @Reflective to make their reflection info available in the native image, for example for SpEL or JMX invocations
• Add a GatewayProxyBeanRegistrationAotProcessor to register proxy interfaces info for messaging gateways (either instance of the GatewayProxyFactoryBean)
• Rework ConverterRegistrar to not use a beanFactory.getBeansWithAnnotation() since it is not available after AOT phase. Instead, register an intermediate IntegrationConverterRegistration bean definition from the IntegrationConverterInitializer
• Refactor GlobalChannelInterceptorInitializer a bit according to a new logic in the IntegrationConverterInitializer
• Remove JsonNodeWrapperToJsonNodeConverter bean registration from the DefaultConfiguringBeanFactoryPostProcessor - it is added by the ConverterRegistrar into the target ConversionService
• Fix ParentContextTests respectively a JsonNodeWrapperToJsonNodeConverter bean removal
• Refactor XsltPayloadTransformer to not load a ServletContextResource, but just use its name for the xslResource condition

[artembilan]

@mhalbritter, FYI.

Would be great if you review this and leave some your feedback.

I tested the solution against the mentioned integration application in Spring Native at sb-3.0.x branch. It works well without Spring Data. Its failure, though, is not relevant to Spring Integration: Spring Data team investigates some effort for inner bean with Spring AOT. Perhaps I will need more serialization hints when my GenericJackson2JsonRedisSerializer is available with Spring Data fix. But this one can simply go to the next PR/commit.

Thanks

[mhalbritter]

Hey @artembilan,

i've looked at the code and left some comments. I can't tell if the bean factory stuff is fine, as I don't have enough knowledge in Spring Integration / Spring Framework internals yet. Maybe asking for review from one of the more experienced colleagues helps :)

[artembilan]

@sdeleuze , @mhalbritter , @snicoll ,

it looks like I have answered for all your questions and we have some plan going forward in the https://github.com/spring-projects/spring-integration/issues/3844. Is there anything what keeps us from merging this?

Thanks

[mhalbritter]

Fine for me.

[artembilan]

This is ready for review and possibly merge. The PR for spring-aot-smoke-tests project is follow up.