On Dec 1, 2:53 pm, Rich Hickey <[EMAIL PROTECTED]> wrote:
> Could you give some more information on the error you get (when log4j
> is not found), especially a stack trace? And also some more
> information on how your gjdv.logging macros work?
Minimal example to produce the results:
3 libraries: extdep, nodep and bad
extdep and nodep both define a function/macro "workhorse". bad
uses one of these workhorse functions to define its own
"nice-wrapper". "nice-wrapper" can be a function or macro,
it just gives a different exception.
(ns extdep)
(defn workhorse []
org.apache.log4j.Logger)
(ns nodep)
(defn workhorse []
java.util.logging.Logger)
(ns bad)
(defn extdep-available? []
(try (Class/forName "org.apache.log4j.Logger")
(catch ClassNotFoundException x
false)))
(if (extdep-available?)
(use 'extdep)
(use 'nodep))
(defmacro nice-wrapper []
`(workhorse))
user=> (set! *compile-path* ".")
.
user=> (compile 'extdep)
extdep
user=> (compile 'nodep)
nodep
user=> (compile 'bad)
bad
user=> (bad/nice-wrapper)
org.apache.log4j.Logger
Maverick:/tmp/asdf gj$ rm /Users/gj/.clojure/log4j-1.2.15.jar
Maverick:/tmp/asdf gj$ clojure
Listening...
Clojure
user=> (require 'bad)
nil
user=> (bad/nice-wrapper)
java.lang.Exception: No such namespace: extdep (NO_SOURCE_FILE:2)
user=> (.printStackTrace *e)
java.lang.Exception: No such namespace: extdep (NO_SOURCE_FILE:2)
at clojure.lang.Compiler.analyze(Compiler.java:3922)
at clojure.lang.Compiler.analyze(Compiler.java:3880)
at clojure.lang.Compiler$InvokeExpr.parse(Compiler.java:2724)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4075)
at clojure.lang.Compiler.analyze(Compiler.java:3907)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4061)
at clojure.lang.Compiler.analyze(Compiler.java:3907)
at clojure.lang.Compiler.analyze(Compiler.java:3880)
at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:
3585)
at clojure.lang.Compiler$FnMethod.parse(Compiler.java:3428)
at clojure.lang.Compiler$FnMethod.access$1100(Compiler.java:
3307)
at clojure.lang.Compiler$FnExpr.parse(Compiler.java:2913)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4071)
at clojure.lang.Compiler.analyze(Compiler.java:3907)
at clojure.lang.Compiler.eval(Compiler.java:4107)
at clojure.core$eval__3452.invoke(core.clj:1463)
at clojure.main$repl__5005$fn__5020.invoke(main.clj:100)
at clojure.main$repl__5005.doInvoke(main.clj:96)
at clojure.lang.RestFn.invoke(RestFn.java:426)
at clojure.main$repl_opt__5045.invoke(main.clj:153)
at clojure.main$_main__5069.doInvoke(main.clj:228)
at clojure.lang.RestFn.invoke(RestFn.java:402)
at clojure.lang.AFn.applyToHelper(AFn.java:191)
at clojure.lang.RestFn.applyTo(RestFn.java:137)
at clojure.main.main(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at jline.ConsoleRunner.main(ConsoleRunner.java:69)
Caused by: java.lang.Exception: No such namespace: extdep
at clojure.lang.Compiler.resolveIn(Compiler.java:4229)
at clojure.lang.Compiler.resolve(Compiler.java:4203)
at clojure.lang.Compiler.analyzeSymbol(Compiler.java:4180)
at clojure.lang.Compiler.analyze(Compiler.java:3895)
... 29 more
nil
user=>
For completeness, here is the stacktrace if "nice-wrapper" is a
function:
user=> (.printStackTrace *e)
java.lang.IllegalStateException: Var extdep/workhorse is unbound.
(NO_SOURCE_FILE:0)
at clojure.lang.Compiler.eval(Compiler.java:4120)
at clojure.core$eval__3452.invoke(core.clj:1463)
at clojure.main$repl__5005$fn__5020.invoke(main.clj:100)
at clojure.main$repl__5005.doInvoke(main.clj:96)
at clojure.lang.RestFn.invoke(RestFn.java:426)
at clojure.main$repl_opt__5045.invoke(main.clj:153)
at clojure.main$_main__5069.doInvoke(main.clj:228)
at clojure.lang.RestFn.invoke(RestFn.java:402)
at clojure.lang.AFn.applyToHelper(AFn.java:191)
at clojure.lang.RestFn.applyTo(RestFn.java:137)
at clojure.main.main(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at jline.ConsoleRunner.main(ConsoleRunner.java:69)
Caused by: java.lang.IllegalStateException: Var extdep/workhorse is
unbound.
at clojure.lang.Var.get(Var.java:137)
at bad$nice_function__244.invoke(bad.clj:10)
at user$eval__235.invoke(Unknown Source)
at clojure.lang.Compiler.eval(Compiler.java:4109)
... 15 more
nil
And also, new since yesterday, I found that the following works:
(ns bad)
(defn extdep-available? []
(try (Class/forName "org.apache.log4j.Logger")
(catch ClassNotFoundException x
false)))
(defn wns [symstr]
(symbol (if (extdep-available?)
"extdep"
"nodep")
symstr))
(if (extdep-available?)
(require 'extdep)
(require 'nodep))
(defmacro nice-wrapper []
`(~(wns "workhorse")))
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