Leiningen fails to start a REPL on WinXP machine

Question

I'm using a WinXP (sp3) machine with clojure-1.5.1, leiningen-2.3.4, and the Java 1.7.0_45 jdk. I have no trouble creating a new project with leiningen, starting a clojure shell, or creating and running java programs. However, the following command (please see below) results in the error message(s) displayed. I have added the clojure-1.5.1 and leiningen-2.3.4-standalone.jars to user and system path variables in addition to the creation of a new user and system environmental variable, LEIN_JAR that points to the location of the leiningen.jar file. The classpath for both the user and system variables has also been edited as above. My lein.bat is not missing any double quotes around the location of the LEIN_JAR setting as another poster stated in assisting another beginning(?) user of Clojure. Any constructive help would be appreciated.

My project.clj file :

(defproject test10 "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 "1.5.1"]])

---

Edit 2: lein version command output

C:\>lein version

Leiningen 2.3.4 on Java 1.7.0_45 Java HotSpot(TM) Client VM

C:\>lein repl
Error: Could not find or load main class  -Dfile.encoding=UTF-8
Exception in thread "Thread-4" clojure.lang.ExceptionInfo: Subprocess failed {:e
xit-code 1}
        at clojure.core$ex_info.invoke(core.clj:4327)
        at leiningen.core.eval$fn__3532.invoke(eval.clj:226)
        at clojure.lang.MultiFn.invoke(MultiFn.java:231)
        at leiningen.core.eval$eval_in_project.invoke(eval.clj:326)
        at clojure.lang.AFn.applyToHelper(AFn.java:167)
        at clojure.lang.AFn.applyTo(AFn.java:151)
        at clojure.core$apply.invoke(core.clj:619)
        at leiningen.repl$server$fn__7443.invoke(repl.clj:201)
        at clojure.lang.AFn.applyToHelper(AFn.java:159)
        at clojure.lang.AFn.applyTo(AFn.java:151)
        at clojure.core$apply.invoke(core.clj:617)
        at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1788)
        at clojure.lang.RestFn.invoke(RestFn.java:425)
        at clojure.lang.AFn.applyToHelper(AFn.java:163)
        at clojure.lang.RestFn.applyTo(RestFn.java:132)
        at clojure.core$apply.invoke(core.clj:621)
        at clojure.core$bound_fn_STAR_$fn__4102.doInvoke(core.clj:1810)
        at clojure.lang.RestFn.invoke(RestFn.java:397)
        at clojure.lang.AFn.run(AFn.java:24)
        at java.lang.Thread.run(Thread.java:744)
REPL server launch timed out.
C:\>

Answer 1

Thank you for the response. The output from lein version looks good. Sorry for the long message :)

Here is my approach to trouble shooting this further. Please make sure you are checking the system logs maintained by Windows. Pertinent messages could be routed to the system logs and not displayed in the console.

So far it appears leinegen can execute, some, but not all of it's commands. If you execute "lein help", you will get list of available commands.

My first thought is, leinegen is having trouble with the "lein repl" defaults. Thus, instead having leinegen choose default values for host and port, set them explictily in the command line. For example: "lein repl :start :host localhost :port 5554" or "lein repl :start :host 127.0.0.1 :port 5554".

I would change in to your "example" directory and verify that "lein deps", "lein check" and "lein compile" all run error free.

Finally, I would edit the example project. Add the following line to project.clj (right after the :dependencies clause)

:main example.core

That line tells leinegen what the entry point of the "example" program is.

Next we need to edit the "src/example/core.clj" file. Delete the contents and replace it with the following "hello word":

(ns example.core)

(defn -main [& args ] (println "Hello, World!"))

Now, from the root of the example project (C:/>example) run "lein run". Please post the results. If "lein run" succeeds try "lein repl" one more time from the root of the example project.

Again. make sure you check the Window's logs for messages. It might also help to run "lein deps", "lein check" and "lein complile" from the root of the example project. See if any errors are raised that are more helpful.

Answer 2

Sorry I don't use MS Windows. However I have a couple suggestions.

You said you were able to create a new project with leiningen. What disk/directory did you create that project in?

Per your post, it looks like you are issuing the "lein repl" command from the root disk directory of your "c:" drive. Is that where you created a project?

If you change to a different disk/directory, do you get the same error message?

Perhaps leiningen is picking some artifacts it can't resolve in your root directory (I.E. C:/>). Thus, check to see if you can run "lein repl" from a different disk directory.

If you are only getting an error when you running "lein repl" from the root of a project directory, please post some information about the project (E.G. the contents of your project.clj file).

Hope that helps.

Answer 3

1. Check to make sure that lein is not in a directory whose path has any spaces or capitalized characters in it.

2. Make sure the JDK is in a directory with no spaces or capitalized characters in it.

3. Make sure JAVA_HOME is set

4. Make sure java is in your SYSTEM path