Simple jar reference not working

[Doug Hill]

Hi, all. I'm new to Clojure and am working through the examples in Halloway's book Programming Clojure. I am not new to Eclipse, having used it for Java and R development, which is the reason I decided to try CounterClockwise as my Clojure environment. 

The project I'm working on was created using the New/Clojure Project option in CCW.

My problem is that even after adding a particular clojure jar file, clojure-contrib.jar, to Referenced Libraries via the Project Properties/Add External Jar, I still can't successfully (use <namespace>) any of the namespaces in that file - I get FileNotFound errors. I've attached a screenshot showing the commands I've tried, the library reference, and errors I get. As I recall, adding a jar file that way always made its packages available in my Java code. 

I've found posts from other users with similar problems, and a common thread is that the Leiningen project.clj file needs to be edited. Since I just want to learn Clojure I'd really rather not have to worry about build tool plumbing at this point, I just want to get a simple REPL environment running and be able to reference local jar and clj files as needed. Hopefully there's a simple way to do that which leverages Eclipse's features in a way I'm familiar with.

My project.clj is:

(defproject test "0.1.0-SNAPSHOT"

  :description "FIXME: write description"

  :url "http://example.com/FIXME"

  :license {:name "Eclipse Public License"

            :url "http://www.eclipse.org/legal/epl-v10.html"}

  :dependencies [[org.clojure/clojure "1.6.0"]])

It did not change when I added the jar reference.

Thanks, Doug

[Laurent PETIT]

Hello Doug,

I think I can help you. 

- currently counterclockwise, indeed, encourages to use leiningen from start. So, by default, it will call leiningen executable to start a new repl. And the leiningen executable has no idea of what you have manually added to the eclipse Java build path. 

- fortunately enough, there's a solution. There's an eclipse preference to start the repl using the eclipse Java build path. It's just that it's not selected by default. You will find it in Preferences > Clojure > General > use leiningen to start new repl (from memory, should be this approximately). 

- please also note that once you have launched a repl, further additions to the Java build path (either manually or through project.clj - the latter not being your case yet), you'll need to restart the repl (dependencies won't be added automatically - this could be a great addition, though, feel free to file an issue for it!)

HTH,

Laurent

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[Doug Hill]

Thanks so much Laurent, that did the trick. Now I only have to climb one learning curve at a time!

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