MapJobRegistry does not pick up jobs from child application context

[jpraet]

With #4855, JobRegistrySmartInitializingSingleton has been deprecated, and instead MapJobRegistry implements SmartInitializingSingleton to auto-register the jobs it discovers in its application context.

But this does not work for jobs that are defined in a child application context.

In the documented example, if you add a MapJobRegistry to the CommonBatchConfiguration, you will notice that the registry remains empty.

[quaff]

Could you provide a failed unit test case?

[jpraet]

GH5197.java

[quaff]

There is no way to know ApplicationContext's child contexts, I think we should undeprecate JobRegistrySmartInitializingSingleton, WDYT? @fmbenhassine