Leiningen是Clojure项目管理工具Leiningen is the easiest way to use Clojure，官网：http://leiningen.org/
1：首先下载Leiningen安装脚本：https://raw.githubusercontent.com/technomancy/leiningen/stable/bin/lein
2：将其保存为lein文件然后移动到/usr/bin/目录下面（Ubuntu14.0.4 LST 64Bit）
y@y:~$ sudo mv my_note/lein /usr/bin/
修改lein权限，让其可以执行：
y@y:/usr/bin$ chmod +x lein
3：执行lein命令，进行安装：
y@y:~$ lein Downloading Leiningen to /home/y/.lein/self-installs/leiningen-2.4.3-standalone.jar now... % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 361 0 361 0 0 297 0 --:--:-- 0:00:01 --:--:-- 297 0 0 0 0 0 0 0 0 --:--:-- 0:01:05 --:--:-- 0 curl: (22) The requested URL returned error: 403 Forbidden Failed to download https://github.com/technomancy/leiningen/releases/download/2.4.3/leiningen-2.4.3-standalone.jar It's possible your HTTP client's certificate store does not have the correct certificate authority needed. This is often caused by an out-of-date version of libssl. Either upgrade it or set HTTP_CLIENT to turn off certificate checks: export HTTP_CLIENT="wget --no-check-certificate -O" # or export HTTP_CLIENT="curl --insecure -f -L -o" It's also possible that you're behind a firewall haven't yet set HTTP_PROXY and HTTPS_PROXY.
[由于国内网络原因不能访问下载链接]
首先清除：
y@y:~$ rm .lein/ -rf
采用VPN或代理进行联网，再次运行下载成功！
y@y:~$ lein Downloading Leiningen to /home/y/.lein/self-installs/leiningen-2.4.3-standalone.jar now... % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 357 0 357 0 0 310 0 --:--:-- 0:00:01 --:--:-- 310 100 14.2M 100 14.2M 0 0 195k 0 0:01:14 0:01:14 --:--:-- 126k (Retrieving org/clojure/tools.nrepl/0.2.3/tools.nrepl-0.2.3.pom from central) (Retrieving org/clojure/pom.contrib/0.1.2/pom.contrib-0.1.2.pom from central) (Retrieving org/sonatype/oss/oss-parent/7/oss-parent-7.pom from central) (Retrieving clojure-complete/clojure-complete/0.2.3/clojure-complete-0.2.3.pom from clojars) (Retrieving org/clojure/tools.nrepl/0.2.3/tools.nrepl-0.2.3.jar from central) (Retrieving clojure-complete/clojure-complete/0.2.3/clojure-complete-0.2.3.jar from clojars) Leiningen is a tool for working with Clojure projects. Several tasks are available: change Rewrite project.clj by applying a function. check Check syntax and warn on reflection. classpath Print the classpath of the current project. clean Remove all files from project's target-path. compile Compile Clojure source into .class files. deploy Build and deploy jar to remote repository. deps Download all dependencies. do Higher-order task to perform other tasks in succession. help Display a list of tasks or help for a given task. install Install the current project to the local repository. jar Package up all the project's files into a jar file. javac Compile Java source files. new Generate project scaffolding based on a template. plugin DEPRECATED. Please use the :user profile instead. pom Write a pom.xml file to disk for Maven interoperability. release Perform :release-tasks. repl Start a repl session either with the current project or standalone. retest Run only the test namespaces which failed last time around. run Run a -main function with optional command-line arguments. search Search remote maven repositories for matching jars. show-profiles List all available profiles or display one if given an argument. test Run the project's tests. trampoline Run a task without nesting the project's JVM inside Leiningen's. uberjar Package up the project files and dependencies into a jar file. update-in Perform arbitrary transformations on your project map. upgrade Upgrade Leiningen to specified version or latest stable. vcs Interact with the version control system. version Print version for Leiningen and the current JVM. with-profile Apply the given task with the profile(s) specified. Run `lein help $TASK` for details. Global Options: -o Run a task offline. -U Run a task after forcing update of snapshots. -h, --help Print this help or help for a specific task. -v, --version Print Leiningen's version. See also: readme, faq, tutorial, news, sample, profiles, deploying, gpg, mixed-source, templates, and copying. y@y:~$
4：运行lein repl进入控制台，发现报以下异常：
y@y:~$ lein repl nREPL server started on port 40433 on host 127.0.0.1 - nrepl://127.0.0.1:40433 Exception in thread "nREPL-worker-0" java.lang.NoSuchMethodError: clojure.tools.nrepl.StdOutBuffer.length()I at clojure.tools.nrepl.middleware.session$session_out$fn__7630.doInvoke(session.clj:43) at clojure.lang.RestFn.invoke(RestFn.java:460) at clojure.tools.nrepl.middleware.session.proxy$java.io.Writer$ff19274a.write(Unknown Source) at java.io.PrintWriter.write(PrintWriter.java:456) at java.io.PrintWriter.write(PrintWriter.java:473) at clojure.core$fn__5471.invoke(core_print.clj:191) at clojure.lang.MultiFn.invoke(MultiFn.java:231) at clojure.core$pr_on.invoke(core.clj:3392) at clojure.core$pr.invoke(core.clj:3404) at clojure.lang.AFn.applyToHelper(AFn.java:154) at clojure.lang.RestFn.applyTo(RestFn.java:132) at clojure.core$apply.invoke(core.clj:624) at clojure.core$prn.doInvoke(core.clj:3437) at clojure.lang.RestFn.applyTo(RestFn.java:137) at clojure.core$apply.invoke(core.clj:624) at clojure.core$println.doInvoke(core.clj:3457) at clojure.lang.RestFn.invoke(RestFn.java:408) at clojure.main$repl_caught.invoke(main.clj:158) at clojure.tools.nrepl.middleware.interruptible_eval$evaluate$fn__7569$fn__7582.invoke(interruptible_eval.clj:76) at clojure.main$repl$fn__6634.invoke(main.clj:259) at clojure.main$repl.doInvoke(main.clj:257) at clojure.lang.RestFn.invoke(RestFn.java:1096) at clojure.tools.nrepl.middleware.interruptible_eval$evaluate$fn__7569.invoke(interruptible_eval.clj:56) at clojure.lang.AFn.applyToHelper(AFn.java:152) at clojure.lang.AFn.applyTo(AFn.java:144) at clojure.core$apply.invoke(core.clj:624) at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1862) at clojure.lang.RestFn.invoke(RestFn.java:425) at clojure.tools.nrepl.middleware.interruptible_eval$evaluate.invoke(interruptible_eval.clj:41) at clojure.tools.nrepl.middleware.interruptible_eval$interruptible_eval$fn__7610$fn__7613.invoke(interruptible_eval.clj:171) at clojure.core$comp$fn__4192.invoke(core.clj:2402) at clojure.tools.nrepl.middleware.interruptible_eval$run_next$fn__7603.invoke(interruptible_eval.clj:138) at clojure.lang.AFn.run(AFn.java:22) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) REPL-y 0.3.2, nREPL 0.2.0-beta5NoSuchMethodError clojure.tools.nrepl.StdOutBuffer.length()I clojure.tools.nrepl.middleware.session/session-out/fn--7630 (session.clj:43)NoSuchMethodError clojure.tools.nrepl.StdOutBuffer.length()I clojure.tools.nrepl.middleware.session/session-out/fn--7630 (session.clj:43)#<Namespace user>Exception in thread "nREPL-worker-2" java.lang.NoSuchMethodError: clojure.tools.nrepl.StdOutBuffer.length()I at clojure.tools.nrepl.middleware.session$session_out$fn__7630.doInvoke(session.clj:43) at clojure.lang.RestFn.invoke(RestFn.java:460) at clojure.tools.nrepl.middleware.session.proxy$java.io.Writer$ff19274a.write(Unknown Source) at java.io.PrintWriter.write(PrintWriter.java:456) at java.io.PrintWriter.write(PrintWriter.java:473) at clojure.core$fn__5471.invoke(core_print.clj:191) at clojure.lang.MultiFn.invoke(MultiFn.java:231) at clojure.core$pr_on.invoke(core.clj:3392) at clojure.core$pr.invoke(core.clj:3404) at clojure.lang.AFn.applyToHelper(AFn.java:154) at clojure.lang.RestFn.applyTo(RestFn.java:132) at clojure.core$apply.invoke(core.clj:624) at clojure.core$prn.doInvoke(core.clj:3437) at clojure.lang.RestFn.applyTo(RestFn.java:137) at clojure.core$apply.invoke(core.clj:624) at clojure.core$println.doInvoke(core.clj:3457) at clojure.lang.RestFn.invoke(RestFn.java:408) at clojure.main$repl_caught.invoke(main.clj:158) at clojure.tools.nrepl.middleware.interruptible_eval$evaluate$fn__7569$fn__7582.invoke(interruptible_eval.clj:76) at clojure.main$repl$fn__6634.invoke(main.clj:259) at clojure.main$repl.doInvoke(main.clj:257) at clojure.lang.RestFn.invoke(RestFn.java:1096) at clojure.tools.nrepl.middleware.interruptible_eval$evaluate$fn__7569.invoke(interruptible_eval.clj:56) at clojure.lang.AFn.applyToHelper(AFn.java:152) at clojure.lang.AFn.applyTo(AFn.java:144) at clojure.core$apply.invoke(core.clj:624) at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1862) at clojure.lang.RestFn.invoke(RestFn.java:425) at clojure.tools.nrepl.middleware.interruptible_eval$evaluate.invoke(interruptible_eval.clj:41) at clojure.tools.nrepl.middleware.interruptible_eval$interruptible_eval$fn__7610$fn__7613.invoke(interruptible_eval.clj:171) at clojure.core$comp$fn__4192.invoke(core.clj:2402) at clojure.tools.nrepl.middleware.interruptible_eval$run_next$fn__7603.invoke(interruptible_eval.clj:138) at clojure.lang.AFn.run(AFn.java:22) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Error loading namespace; falling back to userNoSuchMethodError clojure.tools.nrepl.StdOutBuffer.length()I clojure.tools.nrepl.middleware.session/session-out/fn--7630 (session.clj:43)NoSuchMethodError clojure.tools.nrepl.StdOutBuffer.length()I clojure.tools.nrepl.middleware.session/session-out/fn--7630 (session.clj:43)user=>
google了一番原来是leiningen2.4.3的一个BUG:https://github.com/technomancy/leiningen/issues/1625
解决方法：将其回退到2.4.2版
y@y:~$ lein downgrade 2.4.2 Downloading Leiningen to /home/y/.lein/self-installs/leiningen-2.4.2-standalone.jar now... % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 355 0 355 0 0 320 0 --:--:-- 0:00:01 --:--:-- 320 100 13.2M 100 13.2M 0 0 432k 0 0:00:31 0:00:31 --:--:-- 611k The script at /usr/bin/lein will be upgraded to the latest 2.4.2 version. Do you want to continue [Y/n]? Y Upgrading... % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 136 0 136 0 0 123 0 --:--:-- 0:00:01 --:--:-- 123 100 11871 100 11871 0 0 2603 0 0:00:04 0:00:04 --:--:-- 7693 mv: 无法将"/tmp/lein-12771-upgrade" 移动至"/usr/bin/lein": 权限不够 Leiningen 2.4.2 on Java 1.7.0_55 Java HotSpot(TM) 64-Bit Server VM
5：再次运行lein repl 成功
y@y:~$ lein repl nREPL server started on port 33169 on host 127.0.0.1 - nrepl://127.0.0.1:33169 REPL-y 0.3.1 Clojure 1.6.0 Docs: (doc function-name-here) (find-doc "part-of-name-here") Source: (source function-name-here) Javadoc: (javadoc java-object-or-class-here) Exit: Control+D or (exit) or (quit) Results: Stored in vars *1, *2, *3, an exception in *e user=>
输出helo,world
user=> (println "Hello,world!") Hello,world! nil user=>