BTW, about `conversionService`, I was thinking about https://jira.springsource.org/browse/INT-1639 and there was an idea to introduce some `IntegrationEvaluationContextAware`, where `BeanFactory` and `ConversionService` have been comming from injection of some `IntegrationEvaluationContext` prototype bean with `<spel-function>` ability. In most cases we need `conversionService` exactly for SpEL. So, it will be another big refactoring throughout the framework...