问题
I'm trying to compile clojure source into class file, and run it using command line only, no lein, nor (possibly) reply.
I have core.clj in src/hello
directory.
.
└── src
└── hello
└── core.clj
This is source code.
(ns hello.core)
(defn -main
"This should be pretty simple."
[]
(println "Hello, World!"))
using (compile)
in REPL.
From the hint in this site (http://clojure.org/compilation), I tried to get class file from REPL.
I started REPL with lein repl
in src directory, then tried to compile to get an error.
user=> (compile 'hello.core)
CompilerException java.io.IOException: No such file or directory, compiling:(hello/core.clj:1:1)
Command line
From this post simple tool for compiling Clojure .clj into .class / .jar and How to compile file in clojure, it seems like that I can compile the clojure source outside REPL.
I tried this in .
to get an error.
> java -cp .:<PATH>/clojure-1.6.0.jar -Dclojure.compile.path=build clojure.lang.Compile src/hello/core.clj
Compiling src/hello/core.clj to build
Exception in thread "main" java.io.FileNotFoundException: Could not locate
hello/core/clj__init.class or hello/core/clj.clj on classpath:
at clojure.lang.RT.load(RT.java:443)
at clojure.lang.RT.load(RT.java:411)
...
So, here are my questions:
- How can I compile the clojure source to get the class with/without REPL?
- How to run the class with Java? Is it enough to execute
java -cp .:CLOJURE_JAR main
?
回答1:
REPL
When invoking REPL, you should add class path.
java -cp .:<PATH>/clojure-1.6.0.jar:./src clojure.main
You need to set the *compile-path*
with (set! *compile-path* "build")
.
Then you can compile to get the class file.
user=> (compile 'hello.core)
hello.core
Command line
There are two issues:
- For compilation, the CP should include the source directory.
- The parameter is not the file path, but the namespace.
This is to invoke the compiler.
clojure> java -cp .:<PATH>/clojure-1.6.0.jar:./src -Dclojure.compile.path=build clojure.lang.Compile hello.core
Compiling hello.core to build
Execution of the class file
You should point to the directory where the class files are located.
clojure> java -cp .:<PATH>/clojure-1.6.0.jar:./build hello.core
Hello, World!
References
- Compiling Clojure?
- http://clojure.org/compilation
来源:https://stackoverflow.com/questions/29011295/compile-clojure-source-into-class-aot-from-command-line-not-using-lein