Using Lein with Local Jars on Heroku

[Asim Jalis]

I am trying to push a Clojure app on Heroku. I have a local jar file
that the app needs. How can I get lein to use the local jar?

When I have local jar dependencies on my personal machine I just
install the jar into the local maven repository on the machine. It's
not obvious to me how to do this on Heroku. Does anyone have any
experience with this or ideas on how to solve this?

Thanks.

Asim

[Robert Levy]

I was wondering the same thing and I came across your un-answered question here.  The short answer appears to be http://devcenter.heroku.com/articles/local-maven-dependencies

I was looking into writing a Clojure web app that I would license to an acquaintance who is starting a business, and I wanted to see if I could give him a something that he could deploy to Heroku and manage on his own without making the source available to him (at first). This is possible to do by pushing a lein project to heroku that depends on a jar containing the main application code. (As a side note, I could be wrong but I think lein has nonconfigurable behavior to include source files in the jar.  So a minor change to lein might be required for conveniently building jars with no source.)  Since it would be proprietary at first (I would like to make it free later) it would make sense for the jar to be local rather than placing it in the Clojars maven repo.

I thought maybe there would be a command to add a jar to a local maven repo, but from my brief research into this, it seems that "unmanaged dependencies" (linked above) is the way to do this.  I haven't tried this yet, but think the only difference for Clojure projects is that it shouldn't be necessary to edit the pom, but just add the dependency as you normally would in project.clj.

Rob

[Phil Hagelberg]

On Tue, Dec 6, 2011 at 11:12 AM, Robert Levy <r.p....@gmail.com> wrote:
> I was wondering the same thing and I came across your un-answered question
> here.  The short answer appears to
> be http://devcenter.heroku.com/articles/local-maven-dependencies
>

> As a side note, I could be wrong but I think lein has
> nonconfigurable behavior to include source files in the jar.

No, you can disable this in project.clj.

> I thought maybe there would be a command to add a jar to a local maven repo,
> but from my brief research into this, it seems that "unmanaged dependencies"
> (linked above) is the way to do this.

There's a plugin, but this is only useful in the context of local
development: https://github.com/kumarshantanu/lein-localrepo

You can certainly store your jars in git, but a better approach is to
keep them in a private Maven repository. This can be done by running
your own server, using a repository service, or uploading jars to S3
in the repository format. I'm working on putting together better
documentation for this.

-Phil

[Matjaz Gregoric]

As others have noted, keeping jars together with the source is usually not the best approach... but sometimes it just might be. For those rare occasions, the instructions on how to do this with leiningen are here:

http://www.pgrs.net/2011/10/30/using-local-jars-with-leiningen/

Matjaz

Asim

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