Re: [jakarta.ee-spec.committee] Incremental vs Big Bang boms

[Bill Shannon <bill.shannon@xxxxxxxxxx>]

Scott Stark wrote on 5/29/19 12:24 PM:
> Another question is how would we envision a profile bom to be defined in an
> incremental vs Big Bang approach. The incremental approach seems
> straightforward, there is a mix of javax and jakarta based artifacts
> depending on what has been updated.
> 
> The Big Bang bom leaves a question of what should be in it. Consider a
> Jakarta EE 9 Big Bang release where only the REST spec has been updated, but
> all apis now are under the jakarta.* namespace. Greenfield development would
> only use jakarta.* based classes and would work with a bom that only included
> those artifacts.
> 
> If I have a Jakarta EE 8 app that is updated to use the new REST apis, it
> would need to include both Jakarta EE 8 and Jakarta EE 9 boms to compile the
> app. Do we envision having a compatibly bom such that there is a single bom a
> user could use to still build from source against? The concern here is that
> they intended to update all REST api usage to the Jakarta EE 9 apis, but
> missed some locations. If they have to include both Jakarta EE 8 and Jakarta
> EE 9 boms, this would be masked. If there was a Jakarta EE 9 compatibility
> bom, compiling against it would fail on the locations that did not update
> from JAX-RS to the Jakarta EE 9 REST apis.

That would only be an issue with the incremental approach where the bom
would have the jakarta.rest.* APIs but not the javax.ws.rs.* APIs, right?

If compatibility works by effectively "aliasing" the javax names to the
jakarta names, an app, or even a class, could mix and match javax names
and jakarta names and still work.  (Whether fine grained mixing is a good
idea is a separate issue.  :-))  And yes, it would need to depend on the
appropriate bom(s) or pom(s) to get access to the APIs it needs.


Whether there's a "compatibility bom" and what it's called would seem to
depend on whether compatibility is a Jakarta EE spec of some sort or whether
it's left completely to products to provide.  In any event, there would
continue to be the Jakarta EE 8 bom.