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Re: [cross-project-issues-dev] Guava 15/21 warning

Hi Gunnar

There is no problem with Orbit, given the need to allow Guava to be a non-singleton.

If you have a technical solution that allows multiple Guava versions to co-exist, please add it to Bug 437107. My current understanding is that "uses" directives may be a solution but that no demonstration has been performed and so the requirements for tooling are at best guesses and of course not yet implemented. It is unlikleyt that any project currently complies with any potential "uses" solution.

IMHO Bug 437107 requires a solution, not a WONTFIX. Until we have a demonstrable solution with associated tooling, I feel we need to stick with the Luna 'solution'; all project's Guava dependency bounds include at least an agreed version and only that version is bundled, so only that version is used in practice.


        Ed Willink

On 14/03/2017 13:45, Gunnar Wagenknecht wrote:
On 14 Mar 2017, at 14:34, Ed Willink <ed@xxxxxxxxxxxxx> wrote:
Both bugs are assigned to nobody and in the Cross-Project component. I'm not sure who is responsible. However, it seems impossible to address them as there is no clear path to decide on. It looks like their main purpose is a sink for discussions. I'd suggest closing them as WONTFIX. It doesn't look like they'll ever be solved.

The problem never occurs for individual projects. It only occurs when an integrating project 'inherits' conflicting Guava loads from two distinct component projects with Guava in the APIs.

So Mylyn only is no problem, but something that integrates Mylyn and Xtext can encounter obscure failures when the wrong class is re-used on a code path in which both are used.

FWIW, there are technical solutions to allow projects to co-exist consuming different versions of Guava. Yes it is complicated and gets even more complicated when projects are re-exporting Guava as part of their APIs. But there are solutions that work.

If you believer there are specific problems with regards to the Guava libraries in Orbit please open a bug for Orbit with more details (eg., exceptions). We'll look at addressing them.


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