Re: problem using gen-class and using the class name in the same file

[Kelker Ryan]

There are two things that I've notice about your code that could probably be the cause. In the :constructors section of :gen-class, you're refering to test-gen.Tata although it doesn't exist yet. The -pre-init function also tries to call a class that doesn't exist yet.

 

12.06.2013, 16:39, "Armel Esnault" <armel....@gmail.com>:

Hi

I try to compile a file that generate a class with gen-class that include class name
 at different places in the file here is a simplified version of the problem:

lein init test-gen

then edit the core.clj with
----------------------
(ns test-gen.core
  (:gen-class
   :name test-gen.Tata
   :init pre-init
   :constructors {
                 [Integer] [Integer]
                [test-gen.Tata] [Integer]
    }
   )
)

(defn -pre-init
  [x]
  (test-gen.Tata. 9)
  9)
----------------------
add ":aot [test-gen.core]" in project.clj

then compile with lein compile:

Compiling test-gen.core
Exception in thread "main" java.lang.ClassNotFoundException: test-gen.Tata, compiling:(test_gen/core.clj:1)
    at clojure.lang.Compiler.analyzeSeq(Compiler.java:6462)
    at clojure.lang.Compiler.analyze(Compiler.java:6262)
    at clojure.lang.Compiler.analyze(Compiler.java:6223)
    at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:5618)
    at clojure.lang.Compiler$TryExpr$Parser.parse(Compiler.java:2136)
    at clojure.lang.Compiler.analyzeSeq(Compiler.java:6455)
    at clojure.lang.Compiler.analyze(Compiler.java:6262)
    at clojure.lang.Compiler.analyze(Compiler.java:6223)
    at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:5618)
    at clojure.lang.Compiler$FnMethod.parse(Compiler.java:5054)
    at clojure.lang.Compiler$FnExpr.parse(Compiler.java:3674)
    at clojure.lang.Compiler.analyzeSeq(Compiler.java:6453)
    at clojure.lang.Compiler.analyze(Compiler.java:6262)
    at clojure.lang.Compiler.analyzeSeq(Compiler.java:6443)
    at clojure.lang.Compiler.analyze(Compiler.java:6262)
    at clojure.lang.Compiler.analyze(Compiler.java:6223)
    at clojure.lang.Compiler$InvokeExpr.parse(Compiler.java:3497)
    at clojure.lang.Compiler.analyzeSeq(Compiler.java:6457)
    at clojure.lang.Compiler.analyze(Compiler.java:6262)
    at clojure.lang.Compiler.analyze(Compiler.java:6223)
    at clojure.lang.Compiler.compile1(Compiler.java:7030)
    at clojure.lang.Compiler.compile1(Compiler.java:7025)
    at clojure.lang.Compiler.compile(Compiler.java:7097)
    at clojure.lang.RT.compile(RT.java:387)
    at clojure.lang.RT.load(RT.java:427)
    at clojure.lang.RT.load(RT.java:400)
    at clojure.core$load$fn__4890.invoke(core.clj:5415)
    at clojure.core$load.doInvoke(core.clj:5414)
    at clojure.lang.RestFn.invoke(RestFn.java:408)
    at clojure.core$load_one.invoke(core.clj:5227)
    at clojure.core$compile$fn__4895.invoke(core.clj:5426)
    at clojure.core$compile.invoke(core.clj:5425)
    at user$eval7.invoke(NO_SOURCE_FILE:1)
    at clojure.lang.Compiler.eval(Compiler.java:6511)
    at clojure.lang.Compiler.eval(Compiler.java:6501)
    at clojure.lang.Compiler.eval(Compiler.java:6477)
    at clojure.core$eval.invoke(core.clj:2797)
    at clojure.main$eval_opt.invoke(main.clj:297)
    at clojure.main$initialize.invoke(main.clj:316)
    at clojure.main$null_opt.invoke(main.clj:349)
    at clojure.main$main.doInvoke(main.clj:427)
    at clojure.lang.RestFn.invoke(RestFn.java:421)
    at clojure.lang.Var.invoke(Var.java:419)
    at clojure.lang.AFn.applyToHelper(AFn.java:163)
    at clojure.lang.Var.applyTo(Var.java:532)
    at clojure.main.main(main.java:37)
Caused by: java.lang.ClassNotFoundException: test-gen.Tata
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at clojure.lang.DynamicClassLoader.findClass(DynamicClassLoader.java:61)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:266)
    at clojure.lang.RT.classForName(RT.java:2039)
    at clojure.core$the_class.invoke(genclass.clj:99)
    at clojure.core$map$fn__4087.invoke(core.clj:2432)
    at clojure.lang.LazySeq.sval(LazySeq.java:42)
    at clojure.lang.LazySeq.seq(LazySeq.java:60)
    at clojure.lang.RT.seq(RT.java:473)
    at clojure.lang.RT.countFrom(RT.java:526)
    at clojure.lang.RT.count(RT.java:519)
    at clojure.core$generate_class$to_types__5402.invoke(genclass.clj:131)
    at clojure.core$generate_class.invoke(genclass.clj:293)
    at clojure.core$gen_class.doInvoke(genclass.clj:622)
    at clojure.lang.RestFn.invoke(RestFn.java:1557)
    at clojure.lang.Var.invoke(Var.java:477)
    at clojure.lang.AFn.applyToHelper(AFn.java:277)
    at clojure.lang.Var.applyTo(Var.java:532)
    at clojure.lang.Compiler.macroexpand1(Compiler.java:6366)
    at clojure.lang.Compiler.analyzeSeq(Compiler.java:6441)
    ... 45 more
Compilation failed: Subprocess failed

The problem seems to be that i am using  a class that doesn't exist yet.
If i comment all lines referring to test-gen.Tata; compile; uncommment those lines; compile; again then it works.
Is there a way a better to compile self referring class ?

Regards

 

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[Armel Esnault]

Yes exactly, i need a constructor which require an instance of the same class as parameter and i need to create new instances of this class in some methods (i implement an abstract class that require this).

[Meikel Brandmeyer (kotarak)]

Hi,

test-gen.Tata should probably be test_gen.Tata everywhere. The reference in the pre-init function should be fine, because the defn is compiled after the generated class is in place.

Meikel

[Armel Esnault]

It seems that only the constructor is the problem. it there is workaround to solve this ?
I have several gen-class calls each need a constructor with an instance of the same class as parameter.

[Meikel Brandmeyer]

Did you check the spelling? - is not valid in a package name. AFAIR using the classname there should work.

Meikel

2013/6/12 Armel Esnault <armel....@gmail.com>

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[Armel Esnault]

i made the same test without any "-" or "_" the problem is still there

[joshro...@gmail.com]

I was messing around recently with creating a Builder class using gen-class and ran into the same issue since each set* method returns this. I'm pretty sure it's a chicken and egg issue: the class doesn't exist yet but you need to specify it in the gen-class ...

I reworked your example a little bit, see if this fixes the problem: https://www.refheap.com/15708 and https://www.refheap.com/15709

I used Object in gen-class, and then check the type in the init.

Josh

[Armel Esnault]

It works for me!!
Thanks josh, meikel and kelker for your answers.

[joshro...@gmail.com]

On Wednesday, June 12, 2013 9:31:55 AM UTC-7, Armel Esnault wrote:

It works for me!!
Thanks josh, meikel and kelker for your answers.

Glad that works. Also note that my :constructors has a redundant entry: it can just be :constructors {[Object] []} since the type check is in -init.