lein uberjar -没有正确设置主类？

Question

在一个新的lein new re-frame bc +handler应用程序上，如果我使用lein uberjar或lein jar，它似乎不能正确设置主类。在推理的最后，它告诉我

Warning: The Main-Class specified does not exist within the jar. It may not be executable as expected. A gen-class directive may be missing in the namespace which contains the main method, or the namespace has not been AOT-compiled.

下面是使用template+处理程序模板创建的server.clj和project.clj：

server.clj：

(ns bc.server
  (:require [bc.handler :refer [handler]]
            [config.core :refer [env]]
            [ring.adapter.jetty :refer [run-jetty]])
  (:gen-class))

 (defn -main [& args]
   (let [port (Integer/parseInt (or (env :port) "3000"))]
     (run-jetty handler {:port port :join? false})))

project.clj：

(defproject bc "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.10.1"]
                 [org.clojure/clojurescript "1.10.597"
                  :exclusions [com.google.javascript/closure-compiler-unshaded
                               org.clojure/google-closure-library
                               org.clojure/google-closure-library-third-party]]
                 [thheller/shadow-cljs "2.8.83"]
                 [reagent "0.8.1"]
                 [re-frame "0.10.9"]
                 [compojure "1.6.1"]
                 [yogthos/config "1.1.7"]
                 [ring "1.7.1"]]

  :plugins [
            [lein-shell "0.5.0"]]

  :min-lein-version "2.5.3"

  :source-paths ["src/clj" "src/cljs"]

  :clean-targets ^{:protect false} ["resources/public/js/compiled" "target"]


  :shell {:commands {"open" {:windows ["cmd" "/c" "start"]
                             :macosx  "open"
                             :linux   "xdg-open"}}}

  :aliases {"dev"          ["with-profile" "dev" "do"
                            ["clean"]
                            ["run" "-m" "shadow.cljs.devtools.cli" "watch" "app"]]
            "prod"         ["with-profile" "prod" "do"
                            ["clean"]
                            ["run" "-m" "shadow.cljs.devtools.cli" "release" "app"]]
            "build-report" ["with-profile" "prod" "do"
                            ["clean"]
                            ["run" "-m" "shadow.cljs.devtools.cli" "run" "shadow.cljs.build-report" "app" "target/build-report.html"]
                            ["shell" "open" "target/build-report.html"]]
            "karma"        ["with-profile" "prod" "do"
                            ["clean"]
                            ["run" "-m" "shadow.cljs.devtools.cli" "compile" "karma-test"]
                            ["shell" "karma" "start" "--single-run" "--reporters" "junit,dots"]]}

  :profiles
  {:dev
   {:dependencies [[binaryage/devtools "0.9.11"]]}

   :prod { }

   :uberjar {:source-paths ["env/prod/clj"]
             :omit-source  true
             :main         bc.server
             :aot          [bc.server]
             :uberjar-name "bc.jar"
             :prep-tasks   ["compile" ["prod"]]}
   })

当我使用lein uberjar时，它确实会生成一个jar文件，但是当我尝试运行它时，它会错误地告诉我它不包含主类。

我做错了什么？

Answer 1

您的uberjar配置文件在:prep-tasks中调用["compile" ["prod"]]。您的"prod"别名调用"clean"，"target"列在:clean-targets中。

从本质上讲，您的uberjar会删除已编译的Clojure代码。

Answer 2

您需要告诉leiningen哪个名称空间具有您的main函数。在project.clj中

  :main my.service.runner

来自：https://github.com/technomancy/leiningen/blob/master/sample.project.clj#L222