Null Pointer Exception on use of lib

[mvid]

When compiling, I get this trace:

WARNING: flush already refers to: #'clojure.core/flush in namespace: clojurewerkz.spyglass.client, being replaced by: #'clojurewerkz.spyglass.client/flush Exception in thread "main" java.lang.NullPointerException, compiling:(stinger.clj:1) at clojure.lang.Compiler$InvokeExpr.eval(Compiler.java:3342) at clojure.lang.Compiler.compile1(Compiler.java:6985) at clojure.lang.Compiler.compile1(Compiler.java:6975) at clojure.lang.Compiler.compile(Compiler.java:7046) at clojure.lang.RT.compile(RT.java:385) at clojure.lang.RT.load(RT.java:425) at clojure.lang.RT.load(RT.java:398) at clojure.core$load$fn__4610.invoke(core.clj:5386) at clojure.core$load.doInvoke(core.clj:5385) at clojure.lang.RestFn.invoke(RestFn.java:408) at clojure.core$load_one.invoke(core.clj:5200) at clojure.core$load_lib.doInvoke(core.clj:5237) at clojure.lang.RestFn.applyTo(RestFn.java:142) at clojure.core$apply.invoke(core.clj:602) at clojure.core$load_libs.doInvoke(core.clj:5271) at clojure.lang.RestFn.applyTo(RestFn.java:137) at clojure.core$apply.invoke(core.clj:602) at clojure.core$require.doInvoke(core.clj:5352) at clojure.lang.RestFn.invoke(RestFn.java:421) at credits.core$loading__4505__auto__.invoke(core.clj:1) at clojure.lang.AFn.applyToHelper(AFn.java:159) at clojure.lang.AFn.applyTo(AFn.java:151) at clojure.lang.Compiler$InvokeExpr.eval(Compiler.java:3337) at clojure.lang.Compiler.compile1(Compiler.java:6985) at clojure.lang.Compiler.compile1(Compiler.java:6975) at clojure.lang.Compiler.compile(Compiler.java:7046) at clojure.lang.RT.compile(RT.java:385) at clojure.lang.RT.load(RT.java:425) at clojure.lang.RT.load(RT.java:398) at clojure.core$load$fn__4610.invoke(core.clj:5386) at clojure.core$load.doInvoke(core.clj:5385) at clojure.lang.RestFn.invoke(RestFn.java:408) at clojure.core$load_one.invoke(core.clj:5200) at clojure.core$compile$fn__4615.invoke(core.clj:5397) at clojure.core$compile.invoke(core.clj:5396) at user$eval31.invoke(NO_SOURCE_FILE:1) at clojure.lang.Compiler.eval(Compiler.java:6465) at clojure.lang.Compiler.eval(Compiler.java:6455) at clojure.lang.Compiler.eval(Compiler.java:6431) at clojure.core$eval.invoke(core.clj:2795) at clojure.main$eval_opt.invoke(main.clj:296) at clojure.main$initialize.invoke(main.clj:315) at clojure.main$null_opt.invoke(main.clj:348) at clojure.main$main.doInvoke(main.clj:426) at clojure.lang.RestFn.invoke(RestFn.java:421) at clojure.lang.Var.invoke(Var.java:405) at clojure.lang.AFn.applyToHelper(AFn.java:163) at clojure.lang.Var.applyTo(Var.java:518) at clojure.main.main(main.java:37) Caused by: java.lang.NullPointerException at clojure.lang.Compiler$ObjExpr.emitVar(Compiler.java:4728) at clojure.lang.Compiler$DefExpr.emit(Compiler.java:395) at clojure.lang.Compiler.compile1(Compiler.java:6984) at clojure.lang.Compiler.compile(Compiler.java:7046) at clojure.lang.RT.compile(RT.java:385) at clojure.lang.RT.load(RT.java:425) at clojure.lang.RT.load(RT.java:398) at clojure.core$load$fn__4610.invoke(core.clj:5386) at clojure.core$load.doInvoke(core.clj:5385) at clojure.lang.RestFn.invoke(RestFn.java:408) at clojure.core$load_one.invoke(core.clj:5200) at clojure.core$load_lib.doInvoke(core.clj:5237) at clojure.lang.RestFn.applyTo(RestFn.java:142) at clojure.core$apply.invoke(core.clj:602) at clojure.core$load_libs.doInvoke(core.clj:5271) at clojure.lang.RestFn.applyTo(RestFn.java:137) at clojure.core$apply.invoke(core.clj:602) at clojure.core$require.doInvoke(core.clj:5352) at clojure.lang.RestFn.invoke(RestFn.java:457) at credits.stinger$loading__4505__auto__.invoke(stinger.clj:1) at clojure.lang.AFn.applyToHelper(AFn.java:159) at clojure.lang.AFn.applyTo(AFn.java:151) at clojure.lang.Compiler$InvokeExpr.eval(Compiler.java:3337)

Seems to have to do with overwriting the function "flush". Any ideas?

[michaelklishin]

The exception is in stinger.clj:1, which is not a library namespace. Do you mind posting your code, at least the way you use the ns macro? I suspect that you are not using it correctly.

[michaelklishin]

The clojure.core/flush warning is a red herring.

[michaelklishin]

What I recommend you to do is to just use ns macro uses from the Getting Started guide if you are new to Clojure. That's why many examples have it.

[mvid]

http://dpaste.org/Wwsww/ that is the code. Nothing special, already uses the ns macro.

[michaelklishin]

The ns macro looks alright but I have doubts it has anything to do with Spyglass. What happens if you take all the code related to it out? Can you open source or send me your entire project?

[mvid]

When I remove all of the code, my tests pass and it compiles no problem.

Modified: http://dpaste.org/HaxBY/

[apage43]

The problem is that Spyglass for some reason breaks if any namespace that is AOT compiled depends on it. In this case it looks like credits.core is being AOT'd (probably because it's the project main) and depends on credits.stringer.

Here's an example project that fails in the same way: https://gist.github.com/3626476

Check it out and attempt to do lein run

[michaelklishin]

@apage43 thanks!

[michaelklishin]

The issue turned out to be that clojurewerkz.spyglass.client shadowed clojure.core/replace. Apparently that function is used by the gen-class machinery. I haven't gotten to the bottom of it and still not sure why exactly scoping seems to matter to it but it's a good idea to fix that anyway.

Should be fixed in 1.0.2 and master.

[Navgeet]

@michaelklishin Can you update clojurememcached.info with the version number. Just tripped on this.

[michaelklishin]

The docs are open source. Please submit a PR if needed. I will do a deploy over the w/e. Sorry about your troubles.

[Navgeet]

@michaelklishin the docs already seem up to date. Seems like just the website is old.