Since we provide a custom `FileNameGenerator` via `fileNameExpression` we should ensure somehow `BeanFactory` injection to that
`FileWritingMessageHandlerSpec` is a `FactoryBean` since version DSL `1.2` and a particular `BPP` takes care about `Spec` internals and register custom `FileNameGenerator` as a bean.
Use standard `FactoryBean` injection in the `lines()` flow to populate the target `FileWritingMessageHandler` to the flow
Generate pom for all project to apply SI Java DSL 1.2 GA
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