Hello,
After a recent discussion on proggit in which I complained that java
interop in clojure was deficient because you couldn't create
subclasses of abstract classes without resorting to java, and was
subsequently alerted to the existence of the 'proxy' form, I decided
to give clojure another go.
Sod's law in action: I think I may have found a compiler bug.
The code I have looks like this:
(if my-test
(do
(import '(com.X.Y.Z MyClass))
(....))
(println "blah"))
Now when I execute said code with my-test equal to nil, I get:
Exception in thread "main" java.lang.Exception: No such namespace:
MyClass (xxx:13)
at clojure.lang.Compiler.analyze(Compiler.java:3950)
at clojure.lang.Compiler.analyze(Compiler.java:3908)
at clojure.lang.Compiler$InvokeExpr.parse(Compiler.java:2732)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4108)
at clojure.lang.Compiler.analyze(Compiler.java:3935)
at clojure.lang.Compiler.access$100(Compiler.java:38)
at clojure.lang.Compiler$LetExpr$Parser.parse(Compiler.java:
3724)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4106)
at clojure.lang.Compiler.analyze(Compiler.java:3935)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4094)
at clojure.lang.Compiler.analyze(Compiler.java:3935)
at clojure.lang.Compiler.analyze(Compiler.java:3908)
at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:
3613)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4106)
at clojure.lang.Compiler.analyze(Compiler.java:3935)
at clojure.lang.Compiler.analyze(Compiler.java:3908)
at clojure.lang.Compiler$IfExpr$Parser.parse(Compiler.java:
2383)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4106)
at clojure.lang.Compiler.analyze(Compiler.java:3935)
at clojure.lang.Compiler.analyze(Compiler.java:3908)
at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:
3613)
at clojure.lang.Compiler$FnMethod.parse(Compiler.java:3456)
at clojure.lang.Compiler$FnMethod.access$1100(Compiler.java:
3335)
at clojure.lang.Compiler$FnExpr.parse(Compiler.java:2921)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:4104)
at clojure.lang.Compiler.analyze(Compiler.java:3935)
at clojure.lang.Compiler.eval(Compiler.java:4140)
at clojure.lang.Compiler.load(Compiler.java:4470)
at clojure.lang.Compiler.loadFile(Compiler.java:4437)
at clojure.lang.Script.main(Script.java:65)
Caused by: java.lang.Exception: No such namespace: MyClass
at clojure.lang.Compiler.resolveIn(Compiler.java:4263)
at clojure.lang.Compiler.resolve(Compiler.java:4237)
at clojure.lang.Compiler.analyzeSymbol(Compiler.java:4214)
at clojure.lang.Compiler.analyze(Compiler.java:3923)
Now, for starters, that error message seems wrong, because if I move
the import to the top of the file, I get an error that looks like:
Exception in thread "main" java.lang.ExceptionInInitializerError...
which I *do* expect, because the static initializer of this class
invokes some code which relies on an RMI object which relies on
rmiregistry which is running on a different machine. But the problem
is *not* that there is no such namespace, unless I'm misunderstanding
something. In other words, the class certainly does exist within the
com.X.Y.Z package, so the code should be correct.
I think what's going on is that while the then-branch is not really
evaluated, the parser walks over the AST and then something funny
happens and we attempt to load MyClass without realizing that it is
actually in package com.X.Y.Z.
In any case, it's not a show-stopper for me, but I just wanted to
alert you to the bug.
Many thanks in advance,
seertaak
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