I am trying to :gen-class a Servlet
This is my code:
(ns test.test
(:import (java.io PrintWriter) (javax.servlet.http HttpServlet))
(:gen-class :name test.TestServlet :extends javax.servlet.http.HttpServlet))
(defn -doGet[request response]
(let [wrtr (.getWriter response)]
(.println wrtr "hello from clojure")))
it can't be compiled by Lein
it said Exception in thread "main" java.lang.ClassNotFoundException: javax.servlet.http.HttpServlet (Test.clj:1)
I already modified the :library-path in Lein as ":library-path "/home/long/workspaces/spring/LongHDi/war/WEB-INF/lib" but it didn't work.
Do you have any idea why?
I am trying to work with Google App Engine. The servlet class I want to extend is already in the lib folder I specified.
Which version of lein are you using ?
I downloaded jetty from here, and lein version1 worked for me with project.clj
(defproject st2 "1.0.0-SNAPSHOT"
:description "FIXME: write description"
:library-path "/Users/Niko/Downloads/jetty-hightide-8.1.7.v20120910/lib"
:aot [st2.core]
:dependencies [[org.clojure/clojure "1.3.0"]])
with st2.core the same as your code:
(ns st2.core
(:import (java.io PrintWriter) (javax.servlet.http HttpServlet))
(:gen-class :name test.TestServlet :extends javax.servlet.http.HttpServlet))
(defn -doGet[request response]
(let [wrtr (.getWriter response)]
(.println wrtr "hello from clojure")))
If you are using lein2, :library-path is not supported so I suspect you would have to add the dependencies "a-la-maven" and add them to your project dependencies.
Related
I have a Clojure library that has two gen-class directives. When I run lein run, there are no issues. However, when I run lein uberjar, I get errors:
$ lein uberjar
Compiling 6 source files to /Users/frank/src/user/target/uberjar/classes
Compiling user.common
Compiling user.core
java.lang.ClassNotFoundException: user.server.UserAuthenticationServer, compiling:(user/core.clj:15:30)
Exception in thread "main" java.lang.ClassNotFoundException: user.server.UserAuthenticationServer, compiling:(user/core.clj:15:30)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:6926)
.....
at clojure.lang.Compiler.analyze(Compiler.java:6701)
Caused by: java.lang.ClassNotFoundException: user.server.UserAuthenticationServer
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
...
at clojure.lang.Compiler.analyzeSeq(Compiler.java:6919)
... 86 more
In addition to the generated java files, there is the project.clj, server.clj, and core.clj.
project.clj
(defproject user "0.1.0-SNAPSHOT"
:dependencies [[org.clojure/clojure "1.9.0-alpha14"]
[io.grpc/grpc-core "1.7.0"]
[io.grpc/grpc-netty "1.7.0"
:exclusions [io.grpc/grpc-core]]
[io.grpc/grpc-protobuf "1.7.0"]
[io.grpc/grpc-stub "1.7.0"]]
:main ^:skip-aot user.core
:aot [user.server]
:target-path "target/%s"
:source-paths ["src/clj"]
:java-source-paths ["src/generated/proto"
"src/generated/grpc"]
:profiles {:uberjar {:aot :all}})
core.clj
(ns user.core
(:import [io.grpc Server ServerBuilder])
(:gen-class))
(defonce start-server-atom (atom nil))
(def port 8080)
(defn start-server []
(when-not #start-server-atom
(reset! start-server-atom
(-> (ServerBuilder/forPort port)
(.addService (new user.server.UserAuthenticationServer))
.build
.start
.awaitTermination))))
(defn -main
[& args]
(start-server))
server.clj
(ns user.server
(:gen-class
:main false
:name user.server.UserAuthenticationServer
:extends xyz.skroo.user.UserAuthenticationGrpc$UserAuthenticationImplBase))
(defn -startUserAuthentication [this req res]
(.onNext res req)
(.onCompleted res))
It's weird because this was working and I think the compile-time order changed and now I cannot generate a standalone jar.
:profiles {:uberjar {:aot :all}} means that when you run uberjar it will try to compile all Namespaces. When you do lein run it only compiles the namespace in the :aot key.
Try to update the uberjar profile to only aot the server namespace and see if that works.
When I try to create an uberjar using lein with the following very simple Clojure test file, I get an error
Compiling korma-test.core
Exception in thread "main" java.lang.Exception:
lib names inside prefix lists must not contain periods, compiling:(core.clj:1:1)
and cannot figure out why. I got the (use 'korma.db) from sqlkorma.com's docs section, and tried a require statement as well (not listed in my examples here).
project.clj
(defproject korma-test "0.1.0-SNAPSHOT"
:description "korma db test"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.5.1"]
[korma "0.3.0-RC5"]]
:main korma-test.core)
core.clj (simplified)
(ns korma-test.core
(:gen-class)
(use 'korma.db)
(require '[clojure.string :as str])
(:import java.util.Date)
)
(defn -main
[& args]
(let [opts (parse-opts args)
start-time (str (Date.))]))
The ns macro uses keywords in place of functions and does take quoted arguments.
(ns korma-test.core
...
(:use korma.db)
(:require [clojure.string :as str])
...)
There is a nice write-up here: http://blog.8thlight.com/colin-jones/2010/12/05/clojure-libs-and-namespaces-require-use-import-and-ns.html
I am trying to use instaparse lib for my clojure project. I use leiningen 2.0 and clojure 1.5.1 in my project dependencies. I add instaparse to my project dependencies as follow:
(defproject bachelor "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.5.1"]
[org.clojure/clojure-contrib "1.2.0"]
[instaparse "1.1.0"]])
And that is my source where i'm trying to require that lib:
(ns bachelor.data
(:require [clojure.string :as str])
(:require [instaparse.core :as insta])
(:use [clojure.contrib.generic.math-functions])
)
When I try to compile that I get following error message:
cd c:/bachelor/src/bachelor.data/ 1 compiler notes:
Unknown location: error: java.io.FileNotFoundException: Could not
locate instaparse/core__init.class or instaparse/core.clj on
classpath:
company.clj:1:1: error: java.io.FileNotFoundException: Could not
locate instaparse/core__init.class or instaparse/core.clj on
classpath: (company.clj:1)
Compilation failed.
I checked classpath for my project and I think that instaparse should be found there.
lein classpath
C:\bachelor\test;C:\bachelor\src;C:\bachelor\dev-resources;C:\bachelor\resources;C:\bachelor\target\classes;C:\Users\Maciej.m2\repository\instaparse\instaparse\1.1.0\instaparse-1.1.0.jar;C:\Users\Mac
iej.m2\repository\org\clojure\clojure-contrib\1.2.0\clojure-contrib-1.2.0.jar;C:\Users\Maciej.m2\repository\org\clojure\clojure\1.5.1\clojure-1.5.1.jar
Have any idea what I am doing wrong?
UPDATE
I updated result for lein classpath. Earlier, I've pasted old result.
here is a working sample project:
project.clj:
(defproject parse "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.5.1"]
[instaparse "1.1.0"]])
you don't need the lines for contrib, and string is built into clojure now.
src/parse/core.clj:
(ns parse.core
(:require [instaparse.core :as insta]
[clojure.string :as str]))
(def as-and-bs
(insta/parser
"S = AB*
AB = A B
A = 'a'+
B = 'b'+"))
repl:
#<Namespace parse.core>
parse.core> (as-and-bs "aaaaabbbaaaabb")
[:S [:AB [:A "a" "a" "a" "a" "a"] [:B "b" "b" "b"]] [:AB [:A "a" "a" "a" "a"] [:B "b" "b"]]]
parse.core> (str/join "," ["a" "b" "c"])
"a,b,c"
My general Liningen strangeness resolution checklist:
run lein deps and restart nrepl/emacs
lein clean and restart nrepl/emacs
remove the local libs dir (lein v1.x)
remove my local maven repository and run lein deps
I've found out what was wrong. I was creating project with leiningen but develop source with Clojure-box or Clooj. I was also trying to compile my source with that tools and it was mistake. When you run such IDE it loads that's own classpath and that is why it could not find library I'd like to use. Now I compile my src with
lein compile
and run it in
lein repl
and everything is just working fine.
Is it possible to grab the project information within the clojure repl?
For example, if there was a project defined:
(defproject blahproject "0.1.2" ....)
When running a repl in the project directory, is there a function like this?
> (project-version)
;=> 0.1.2
While you can parse project.clj yourself, this may be annoying. It's also a lot of work. Instead, you can just do:
(System/getProperty "projectname.version")
Leiningen project files are just Clojure data :)
(-> "/path/to/project.clj" slurp read-string (nth 2))
I use environ (https://github.com/weavejester/environ) which sucks in settings from a number of sources, including system properties. The project version appears as :<project-name>-version:
foobar.repl=> (require '[environ.core :refer [env]])
nil
foobar.repl=> (:foobar-version env)
"0.1.0-SNAPSHOT"
Add the below code to the end of project.clj:
(def project (assoc-in project [:repl-options :init]
`(~'def ~'project-version ~(project :version))))
Now you will have a var called project-version in the initial namespace for the repl.
As described in this discussion.
(ns myproject.example
(:require [clojure.java.io :as io])
(:import java.util.Properties))
(defn get-version [dep]
(let [path (str "META-INF/maven/" (or (namespace dep) (name dep))
"/" (name dep) "/pom.properties")
props (io/resource path)]
(when props
(with-open [stream (io/input-stream props)]
(let [props (doto (Properties.) (.load stream))]
(.getProperty props "version"))))))
(get-version 'myproject) ; => 0.1.0
(get-version 'org.clojure/clojure) ; => 1.3.0
As vemv said, Leiningen project files are just Clojure data. So, it's easy to access your project as an ordinary hash-map:
(->> "project.clj"
slurp
read-string
(drop 2)
(cons :version)
(apply hash-map)
(def project))
If you need this variable only in your repl, you can add it to repl-options to your project.clj:
(defproject yourproject "0.1.0"
:description ""
:url ""
:dependencies [ [org.clojure/clojure "1.4.0"]]
:repl-options { :init (->> "project.clj"
slurp
read-string
(drop 2)
(cons :version)
(apply hash-map)
(def project))})
Now, you have project variable in your repl. So, to access the version of your project you can simply type (:version project).
Of course, you can simply use native Leiningen code to parse you project file:
(defproject yourproject "0.1.0"
:description ""
:url ""
:dependencies [ [org.clojure/clojure "1.4.0"]
[leiningen-core "2.1.3"]]
:repl-options { :init (do (require 'leiningen.core.project)
(def project
(leiningen.core.project/read)))})
But, if you need only the version of your project and nothing more, then it's best to use Ankur's solution.
For a more fully-featured approach, you might want to take a look at the configleaf plugin for Leiningen (https://github.com/davidsantiago/configleaf). It will make the project map, with active profiles merged in, available to project code in a namespace of your choosing.
In case you need to do this from clojurescript you could create a macro (from another clj file) and call it from the cljs code :
;;ex: macro.clj
(defmacro get-project-version []
(System/getProperty "penelope.version"))
;;my_logic_code.cljs
(ns my-logic-code
(:require-macros [macros :as m]))
(def project-version (m/get-project-version))
I'd like to have two main classes (or more) with leiningen, and then be able to choose which one at the java command line. For example I have:
(ns abc (:gen-class))
(defn -main [] (println "abc"))
(ns def (:gen-class))
(defn -main [] (println "def"))
With a project.clj having:
(defproject my-jar "0.0.1"
:description "test"
:dependencies [
]
:main abc)
Then I build with lein uberjar, and run:
java -cp my-jar-0.0.1-standalone.jar abc
java -cp my-jar-0.0.1-standalone.jar def
I get it that when I specified :main abc in the project.clj it was calling that out as the main-class in the manifest, but I couldn't get it to run without putting something. But either way when I try to run the 'def' main, I get a class not found:
Exception in thread "main" java.lang.NoClassDefFoundError: def
This works at least with leiningen 2.0+
(defproject my-jar "0.0.1"
:description "test"
:dependencies [
]
:profiles {:main-a {:main abc}
{:main-b {:main def}}
:aliases {"main-a" ["with-profile" "main-a" "run"]
"main-b" ["with-profile" "main-b" "run"]})
Then you can run each main like so:
lein main-a
lein main-b
Which expands to this:
lein with-profile main-a run
lein with-profile main-b run
I'm using this in one of my projects and it works perfectly.
I added :aot [abc def] to the project.clj to generate compiled code and it worked.
What worked for me in both lein 2.7.0's run task as well as from the resulting uberjar is as follows...
project.clj:
(defproject many-mains "0.1.0-SNAPSHOT"
:description "Project containing multiple main methods"
:dependencies [[org.clojure/clojure "1.8.0"]]
:main nil
:target-path "target/%s"
:profiles {:main-abc {:main many-mains.abc}
:main-def {:main many-mains.def}
:main-ghi {:main org.rekdev.mm.ghi}
:core {:main many-mains.core}
:uberjar {:aot :all}})
For source like...
$ cat src/many_mains/abc.clj
(ns many-mains.abc
(:gen-class))
(defn -main
""
[& args]
(println "Hello, from many-mains.abc!"))
This lets lein run work like...
$ lein with-profile main-abc run
Hello, from many-mains.abc!
From the command line the '-' in many-mains needs to become a '_' which makes it a legal Java classname.
$ java -cp target/uberjar/many-mains-0.1.0-SNAPSHOT-standalone.jar many_mains.abc
Hello, from many-mains.abc!
There seems to have been some behavior changes between Lein 2.7.0 and prior around the effect of :main nil on the MANIFEST.MF. What I've got here works like a champ in Lein 2.7.0. The full source is at https://github.com/robertkuhar/many-mains