CODEWITHSUNDEEP
eclipseclojure
Bob Jarvis - Слава Україні
Bob Jarvis - Слава Україні

Reputation: 50007

Debugging Clojure in Eclipse

Newbie to Clojure and Eclipse so please bear with me.

I'm running Clojure 1.5.1 under Eclipse Juno with Counterclockwise (CCW) and Leiningen installed, and I'm testing the process of running Clojure code under the Eclipse debugger. I'm using the following file:

(ns myproject.core)

(defn foo [str]
  (println str "Hello, World!")
)

(defn hello [who]
  (str "Hello " who "!"))

I set breakpoints on the (println str "Hello, World!") and (str "Hello " who "!")) lines, select "myproject" in the Package Explorer pane, click on Run-Debug As-Clojure Application, and a REPL starts up. Now, here's the issue/problem: if I type (hello "Fred") in the REPL I get 

CompilerException java.lang.RuntimeException: Unable to resolve symbol: hello
    in this context, compiling:(NO_SOURCE_PATH:1:1)

I get the same error if I try to qualify the procedure call as (myproject.core/hello "Fred"). The only way I get it to run is to first issue (require 'myproject.core) and then issue (myproject.core/hello "Fred"). Once I do this the breakpoints are recognized, the code breaks in the proper place, variables are visible, and life is good.

If I type (use 'myproject.core) instead of (require 'myproject.core) I don't have to fully-qualify the function name, but my understanding is that the use of use is not recommended practice.

On the other hand: if I start the REPL by "sending" the code to the REPL using Ctrl-Alt-S (this is on Windows) I can simply type (hello "Fred") and get the expected output. Of course, doing it this way does not start the debugger, no breakpoints are taken, etc.

My question: is there a way to run the code under the Eclipse debugger, have the namespace automatically recognized as it is when the code is "sent" to the REPL via Ctrl-Alt-S, not have to use require or use, and not have to fully-qualify the function name with the namespace?

Upvotes: 2

Views: 1038

Answers (1)

Rörd
Rörd

Reputation: 6681

Ctrl-Alt-N is bound to "Switch REPL to File's Namespace" in CCW. The REPL starts in the namespace "user", once you've switched to "myproject.core", there shouldn't be any need to use or require anything. You can also switch the namespace with the REPL with in-ns.

Upvotes: 2

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