On Nov 8, 4:44 pm, Stuart Halloway <[email protected]> wrote:
> > This is under clojure 1.2.0, 1.2.1, 1.3.0, though the error messages differ.
>
> > Consider a trivial project that `uses` midje:
>
> > (ns midje-aot.core
> > (:use midje.sweet))
>
> > If it's aot-compiled, everything appears to go well:
>
> > 1762 $ lein compile
> > Copying 6 files to /Users/marick/src/midje-aot/lib
> > Copying 1 file to /Users/marick/src/midje-aot/lib/dev
> > Compiling midje-aot.core
> > Compilation succeeded.
>
> > But certain of the namespaces can't be loaded:
>
> > 1766 $ lein repl
> > REPL started; server listening on localhost port 40437
> > user=> (require 'midje.semi-sweet)
> > NullPointerException clojure.lang.Compiler.lookupVar (Compiler.java:6780)
>
> > What could that exception mean? What's a starting point for debugging?
>
> The full stack trace:
>
> clojure.lang.Compiler.lookupVar (Compiler.java:6780)
> clojure.lang.Compiler.isMacro (Compiler.java:6260)
> clojure.lang.Compiler.macroexpand1 (Compiler.java:6315)
> clojure.lang.Compiler.macroexpand (Compiler.java:6381)
> clojure.lang.Compiler.eval (Compiler.java:6449)
> clojure.lang.Compiler.eval (Compiler.java:6454)
> clojure.lang.Compiler.eval (Compiler.java:6431)
> clojure.core/eval (core.clj:2795)
> midje.util.report__init.load (:4)
> midje.util.report__init.<clinit> (:-1)
> java.lang.Class.forName0 (Class.java:-2)
> java.lang.Class.forName (Class.java:247)
>
> Line 4 of midje.util.report is unusual in several ways: it precedes the ns
> call, adds a second ns call, does an eval, and uses def forms not at the top
> level:
>
> (when (= (class clojure.test/report) clojure.lang.MultiFn)
> (eval
> '(do (require 'clojure.test)
> (ns clojure.test)
> (defonce old-report clojure.test/report))))
>
> Not sure where the problem is yet, and I have no time to look further
> tonight, but perhaps this will help somebody track the root cause.
At least you could simplify this and avoid using eval, by using
clojure.core/intern directly instead of trying to get the compiler to
believe you're in that namespace. Grabbing the source for the defonce
macro, here's a draft of how I might rewrite this to avoid eval:
(let [ns-obj (the-ns (doto 'clojure.test require))
the-var (intern ns-obj 'old-report)]
(when-not (.hasRoot the-var)
(intern ns-obj 'old-report clojure.test/report)))
Seems to have the same effect as the defonce in some simple testing.
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