A third option I'm considering is to simply keep running 1.2 and replace 
the contrib libraries with their modular counterparts, moving to 1.5 only 
after that's done. The two difficulties I see here are:
1) Ensuring all new reports written during this process use the modular 
libraries
2) What to do about contrib libraries which have no counterpart (but this 
difficulty applies to all options)

On Sunday, December 22, 2013 6:51:06 PM UTC-5, solo...@gmail.com wrote:
>
> At my company, we use Clojure for reporting. Specifically, reports are 
> written in Clojure which integrate data from a variety of sources and 
> display the final output to the user in a WPF-based webapp.
>
> For all intents and purposes, each 'report' is a standalone Clojure app, 
> and most of them use the contrib library. Not all of them are active, but 
> there are thousands. And I need to migrate them over to 1.5.
>
> Now I know the contrib libraries are not compatible with 1.3+. From what 
> I've read, the big change is related to dynamic var declaration, and there 
> are subtle incompatibilities involving certain scalars. I also looked at 
> this page for information on each library's migration:
> http://dev.clojure.org/display/community/Where+Did+Clojure.Contrib+Go
>
> I'm considering one of two approaches:
>
> 1) Run both Clojure 1.2 and 1.5, with all new reports required to use the 
> modular contrib libraries. This would require a change to the backend 
> appservers.
>
> 2) Grep the reports and create a list of all the distinct contrib 
> libraries we use. Identify which of the libraries have a modular analog, 
> and replace accordingly. To do this, I would need to check that the 
> function signatures match and the output is remains as expected. I would 
> also still need to run 1.2 running in production and 1.5 in a sandbox to 
> migrate reports over gradually.
>
> Asking individual authors to update their reports won't work.
>
> Please share your opinions on these approaches or what your experience was 
> in migrating from 1.2 to 1.3+.
>
> Also, is there an easier way which I'm not seeing? Thank you.
>
> Sol
>
>
>
>
>
>

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