Does the file you are evaluating have more than 65535 characters? As far as I can tell, that is the maximum length of a String literal in Java (see the CONSTANT_Utf8_info struct in http://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html). I've encountered that limit when using Eclipse/CounterClockwise. The problem occurs when evaluating a file by doing something like:
(clojure.lang.Compiler/load (java.io.StringReader. "the-whole-file-as- a-string")) So the contents of the file ends up as a String literal, and Clojure will generate a corrupt class if that String is too long. CounterClockwise calls a function in nREPL (helpers/load-file-command) that does this. Perhaps Emacs/Slime is doing something similar. I hope that helps. - Pat On Jul 4, 3:11 am, Peter T <ptaoussa...@gmail.com> wrote: > Hi all, > > Since I started using Clojure (I think from just before 1.0) I have, > on the odd occasion, received an error message of this form (Unknown > constant tag X in class file error) while trying to evaluate a > namespace in Slime/Emacs. > > Whenever it cropped up, it was completely random: it never seemed to > have any specific relation to something I'd done in the code. > Sometimes it'd get triggered by an arbitrary change like renaming a > variable or deleting a comment or unused function. > > In all cases, recompiling the project from scratch would get past the > issue. > > I'd always figured it was some random quirk of the compiler. Since it > didn't happen often and could be fixed by a recompile, I just let it > be. > > Today though, I've started running into this error more persistently. > It'll start appearing consistently -right- after a recompile. > > I.e.: I'll compile the project, then try re-evaluate a namespace that > was just compiled (no changes to the code) and it'll throw the error. > > There hasn't been any change to the code in this file and the other > recent changes are all superficial and syntactically correct (proved > also by the fact that the source is compiling successfully). > > I'm using Clojure 1.2.0. > > The best info I could find on this error is here, from > 2009:http://www.mail-archive.com/clojure@googlegroups.com/msg19130.html. > > I don't have any familiarity with Clojure's compiler (or Java or the > JVM) so am a little clueless as to where I'd begin trying to get past > the problem. Any rough idea what might be going on? Am I possibly > bumping into a Clojure/Java/JVM limitation somewhere? Could this be a > Slime/Swank issue? The project's about 21,000 LOC right now, including > lots of comments. This is split into about 40 namespaces/files. > > Kind of in the middle of a product launch right now, so the timing's a > little bit unfortunate: would really appreciate any advice! Thank you! > > The full stack trace is below: > > Unknown constant tag 32 in class file wusoup/web/responses/profiles > $eval7347 > [Thrown class java.lang.ClassFormatError] > > Restarts: > 0: [QUIT] Quit to the SLIME top level > > Backtrace: > 0: java.lang.ClassLoader.defineClass1(Native Method) > 1: java.lang.ClassLoader.defineClass(ClassLoader.java:634) > 2: java.lang.ClassLoader.defineClass(ClassLoader.java:480) > 3: > clojure.lang.DynamicClassLoader.defineClass(DynamicClassLoader.java: > 45) > 4: clojure.lang.Compiler$ObjExpr.getCompiledClass(Compiler.java: > 3964) > 5: clojure.lang.Compiler$FnExpr.parse(Compiler.java:3219) > 6: clojure.lang.Compiler.analyzeSeq(Compiler.java:5367) > 7: clojure.lang.Compiler.analyze(Compiler.java:5190) > 8: clojure.lang.Compiler.eval(Compiler.java:5421) > 9: clojure.lang.Compiler.eval(Compiler.java:5391) > 10: clojure.core$eval.invoke(core.clj:2382) > 11: swank.core$eval_in_emacs_package.invoke(core.clj:94) > 12: swank.core$eval_for_emacs.invoke(core.clj:241) > 13: clojure.lang.Var.invoke(Var.java:373) > 14: clojure.lang.AFn.applyToHelper(AFn.java:169) > 15: clojure.lang.Var.applyTo(Var.java:482) > 16: clojure.core$apply.invoke(core.clj:540) > 17: swank.core$eval_from_control.invoke(core.clj:101) > 18: swank.core$spawn_worker_thread$fn__465$fn__466.invoke(core.clj: > 300) > 19: clojure.lang.AFn.applyToHelper(AFn.java:159) > 20: clojure.lang.AFn.applyTo(AFn.java:151) > 21: clojure.core$apply.invoke(core.clj:540) > 22: swank.core$spawn_worker_thread$fn__465.doInvoke(core.clj:296) > 23: clojure.lang.RestFn.invoke(RestFn.java:398) > 24: clojure.lang.AFn.run(AFn.java:24) > 25: java.lang.Thread.run(Thread.java:636) -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
