Re: How to add an URL into the classpath?
Hi Vladimir and Alex, Thank you for very useful informations. With regards, Yoshinori Kohyama -- 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
Re: How to add an URL into the classpath?
Hi Yoshinori, after (unsuccessfully) struggling with Clojure dynamic ClassLoaders in clojure-1.4, I ended up with the 'brute force' solution--just add URL entries to the Java system classloader. Here is a simple example on how to do it from clojure: (defn add-system-classpath Add an url path to the system class loader [url-string] (let [field (aget (.getDeclaredFields java.net.URLClassLoader) 0)] (.setAccessible field true) (let [ucp (.get field (ClassLoader/getSystemClassLoader))] (.addURL ucp (java.net.URL. url-string) (add-system-classpath file:/some/clojure/root/) (load some/clojure/file) ;; load the some/clojure/file.clj from the /some/clojure/root/ catalog (add-system-classpath file:/some/java/classes/) some.java.MyClass ;; use the some.java.MyClass in the /some/java/classes/ catalog Regards, Vladimir -- 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
Re: How to add an URL into the classpath?
You can also use https://github.com/cemerick/pomegranate - it works fine... On Wed, Nov 21, 2012 at 5:14 PM, Vladimir Tsichevski tsichev...@gmail.com wrote: Hi Yoshinori, after (unsuccessfully) struggling with Clojure dynamic ClassLoaders in clojure-1.4, I ended up with the 'brute force' solution--just add URL entries to the Java system classloader. Here is a simple example on how to do it from clojure: (defn add-system-classpath Add an url path to the system class loader [url-string] (let [field (aget (.getDeclaredFields java.net.URLClassLoader) 0)] (.setAccessible field true) (let [ucp (.get field (ClassLoader/getSystemClassLoader))] (.addURL ucp (java.net.URL. url-string) (add-system-classpath file:/some/clojure/root/) (load some/clojure/file) ;; load the some/clojure/file.clj from the /some/clojure/root/ catalog (add-system-classpath file:/some/java/classes/) some.java.MyClass ;; use the some.java.MyClass in the /some/java/classes/ catalog Regards, Vladimir -- 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 -- With best wishes,Alex Ott http://alexott.net/ Twitter: alexott_en (English), alexott (Russian) Skype: alex.ott -- 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
Re: How to add an URL into the classpath?
Hello clojurians, It seems not to be able to control the whole classpath of my runtime. But my aim, compiling with a path given at runtime and execute it, has been achieved, with (.setContextClassLoader (Thread/currentThread) (DynamicClassLoader. (.getContextClassLoader (Thread/currentThread))) Details reported below. Regards, Yoshinori Kohyama $ cat project.clj (defproject dce 0.0.1 :description Dynamic Compling And Execution :dependencies [[org.clojure/clojure 1.3.0]] :main dce.core) $ cat src/dce/core.clj (ns dce.core (:import java.net.URL clojure.lang.DynamicClassLoader) (:gen-class)) (defn -main [abs-path target-ns args] (let [ccl (.getContextClassLoader (Thread/currentThread)) dcl (if (instance? DynamicClassLoader ccl) ccl (let [l (DynamicClassLoader. ccl)] (.setContextClassLoader (Thread/currentThread) l) l))] (.addURL dcl (URL. (str file:// abs-path /src/))) (.addURL dcl (URL. (str file:// abs-path /classes/))) (binding [*compile-path* (str abs-path /classes)] (compile (symbol target-ns))) (def f (future (apply (resolve (symbol (str target-ns /-main))) args))) (Thread/sleep 5000) (future-cancel f))) $ tree samples samples ├── classes └── src └── foo └── core.clj 3 directories, 1 file $ lein repl REPL started; server listening on localhost port 5997 dce.core= (-main (.getCanonicalPath (java.io.File. samples)) foo.core arg1 arg2) Foo: arg1 arg2 Foo: arg1 arg2 Foo: arg1 arg2 Foo: arg1 arg2 Foo: arg1 arg2 Foo: arg1 arg2 true dce.core= ^D $ tree samplessamples ├── classes │ └── foo │ ├── core$_main.class │ ├── core$loading__4505__auto__.class │ └── core__init.class └── src └── foo └── core.clj 4 directories, 4 files $ lein uberjar ... Created ... dce/dce-0.0.1-standalone.jar $ rm -Rf samples/classes/* $ tree samples samples ├── classes └── src └── foo └── core.clj 3 directories, 1 file $ java -jar dce-0.0.1-standalone.jar `pwd`/samples foo.core arg1 arg2 Foo: arg1 arg2 Foo: arg1 arg2 Foo: arg1 arg2 Foo: arg1 arg2 Foo: arg1 arg2 ^C $ tree samples samples ├── classes │ └── foo │ ├── core$_main.class │ ├── core$loading__4505__auto__.class │ └── core__init.class └── src └── foo └── core.clj 4 directories, 4 files -- 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
Re: How to add an URL into the classpath?
I forgot to show foo/core.clj $ cat samples/src/foo/core.clj (ns foo.core) (defn -main [ args] (loop [] (println Foo: (apply str (interpose args))) (Thread/sleep 1000) (recur))) -- 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
Re: How to add an URL into the classpath?
Hello programmers, Hi, Sierra. Thank you replying. O.K. I can not always contol the classloader of the whole JVM. Then, how can I get the dynamic classloader for my current code/thread? Or can't I? Regards, Yoshinori Kohyama -- 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
Re: How to add an URL into the classpath?
You can't. The dynamic classloader is an internal implementation detail of Clojure; you can't rely on it being available anywhere. If you're interested in runtime control over the the Java classpath, look at https://github.com/cemerick/pomegranate -S On Sunday, July 29, 2012 2:05:00 PM UTC-4, Yoshinori Kohyama wrote: Hello programmers, Hi, Sierra. Thank you replying. O.K. I can not always contol the classloader of the whole JVM. Then, how can I get the dynamic classloader for my current code/thread? Or can't I? Regards, Yoshinori Kohyama -- 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
Re: How to add an URL into the classpath?
Hi Sierra, Thank you for your kind and quick answers to my questions. I see. I'll read the page you referred. Regards, Yoshinori Kohyama -- 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
How to add an URL into the classpath?
Hello clojurians, Adding an URL to the classpath dynamically in REPL succeeded. $ java -cp clojure-1.3.0.jar clojure.main Clojure 1.3.0 user= (def ccl (.getContextClassLoader (Thread/currentThread))) #'user/ccl user= (class ccl) clojure.lang.DynamicClassLoader user= (.addURL ccl (java.net.URL. file:///some/path/)) nil But the program below fails. $ cat addcp.clj (def ccl (.getContextClassLoader (Thread/currentThread))) (println (class ccl)) (.addURL ccl (java.net.URL. file:///some/path/)) $ java -cp clojure-1.3.0.jar clojure.main addcp.clj sun.misc.Launcher$AppClassLoader Exception in thread main java.lang.IllegalArgumentException: No matching method found: addURL for class sun.misc.Launcher$AppClassLoader at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:52) at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:30) at user$eval3.invoke(addcp.clj:3) at clojure.lang.Compiler.eval(Compiler.java:6465) at clojure.lang.Compiler.load(Compiler.java:6902) at clojure.lang.Compiler.loadFile(Compiler.java:6863) at clojure.main$load_script.invoke(main.clj:282) at clojure.main$script_opt.invoke(main.clj:342) at clojure.main$main.doInvoke(main.clj:426) at clojure.lang.RestFn.invoke(RestFn.java:408) at clojure.lang.Var.invoke(Var.java:401) at clojure.lang.AFn.applyToHelper(AFn.java:161) at clojure.lang.Var.applyTo(Var.java:518) at clojure.main.main(main.java:37) While in REPL the loader gotten with .getContextClassLoader is an instance of clojure.lang.DynamicClassLoader, the latter is an sun.misc.Launcher$AppClassLoader. How can I get an clojure.lang.DynamicClassLoader? Or am I wrong with something? Please teach me any information about this. Regards, Yoshinori Kohyama -- 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
Re: How to add an URL into the classpath?
Hello Yoshinori, In general, you cannot modify the JVM classpath at runtime. Clojure uses its own classloader to do dynamic code generation, but you cannot rely on being able to control the classloader which is running the whole JVM. -S -- 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
