Perform deps fetching before compilation in jar task. Fixes #306.

src/leiningen/jar.clj

@@ -202,10 +202,10 @@ function in that namespace will be used as the main-class for executable jar."
   ([project jar-name]
      (when jar-name
        (println "WARNING: Using the jar task with an argument is deprecated."))
-     (let [status (compile/compile project)]
+     (let [deps-fileset (deps project)
+           status (compile/compile project)]
        (if (zero? status)
-         (let [jar-path (get-jar-filename project (get-default-jar-name project))
-               deps-fileset (deps project)]
+         (let [jar-path (get-jar-filename project (get-default-jar-name project))]
            (write-jar project jar-path (filespecs project deps-fileset))
            (println "Created" jar-path)
            jar-path)

todo.org

@@ -31,6 +31,7 @@ See also https://github.com/technomancy/leiningen/issues
   - [X] resources with eval-in-leiningen (#248)
   - [X] fix :omit-default-repositories wrt central (#211)
   - [X] deps should run an implicit clean
+  - [ ] don't let multiple versions of a plugin interfere with each other (#301)
   - [ ] signed deps for plugins (#247)
   - [ ] investigate interactive failures with 1.3 (#234)
   - [ ] recover from errors in repl task (#286)