[Feedback wanted] Support for module dependency declaration

[Marcos Passos]

Hi folks!

I've opened a PR that introduces the possibility of declaring modules dependencies to ensure the object mapper will register the required module as well.

In our case, we've several modules that depend on the Jdk8Module. We also have modules that depend on other modules, e.g.:

• Module A depends on Jdk8Module
• Module B depends on Module A and Jdk8Module
• Module C depends on Module B and Jdk8Module

When you split the serialization modules into fine-grained modules, it's much easier to declare the dependencies at the module level rather than requiring the dependency every time you have to use it.

Please, feel free to leave your comments about the proposal.

- Marcos

[Tatu Saloranta]

I am hoping to hear from anyone interested, who has had challenges in
maintaining (custom) modules; or who otherwise has opinions on this.
Part of the reason I am eager to hear about this relatively soon is
that I am hoping to close work on 2.10 -- 2.10.0.pr2 should be
released within next 4-5 days, and although this is not a deadline for
all work, additions beyond pr2 will get less testing and may face more
scrutiny. Proposed change itself is quite safe but assuming this seems
like a feature of interest to others I would like to get API somewhat
right.

-+ Tatu +-

[Marcos Passos]

We’ve been using this pattern for three months now, and we’ve noticed a considerable improvement since we broke up large packages into smaller ones. Currently, Jackson modules can only declare soft-dependencies which is a bad experience from a developer perspective: you only notice that a dependency is missing at runtime, when in fact they should never have to care about it in the first place. 

- Marcos

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[Tatu Saloranta]

Since I have not heard anything, I think I will proceed with merging
this for 2.10 as suggested

-+ Tatu +-

On Thu, Aug 29, 2019 at 6:08 PM Marcos Passos

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