2b4c343eaa
JIRA: https://jira.spring.io/browse/INT-4270 Initial Commit Remove `final` modifier from certain critical framework methods that prevent CGLib proxies working. Since Spring Boot 2.0 now uses proxyTargetClass=true by default (and has done that for transactional proxies since 1.4), we must relax these restrictions so that CGLib can proxy channels (which is often done to make subflows run in a transaction). When CGLib can't override a `final` method, the fields used within those methods are uninitialized. In the case of `AbstractMessageChannel` this causes an NPE on the unitiallized `dataTypes` field. With `MessageHandler`, fields like `shouldTrack` are always false. Further, methods on `IntegrationObjectSupport` - such as `getComponentName()` return null. I have left setters and `afterPropertiesSet` (on IOS) `final` since these will typically be called before the object is proxied. I suspect there will be other methods we need to open up, but perhaps we should only do them on-demand. __cherry-pick to 4.3.x__
Spring Integration 
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cd spring-integration
./gradlew build
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