[英]gen-class not generating a class
I'm having difficulty referencing classes generated via :gen-class
. 我在引用通过
:gen-class
生成的类时遇到困难。
The smallest example I can show that demonstrates the problem is: 我可以显示的最小的示例说明了这个问题:
(defproject test-proj
:dependencies [[org.clojure/clojure "1.8.0"]]
:aot [test-proj.test])
(ns test-proj.test
(:gen-class))
(defn -main []
(println test_proj.test)) ; Error here
The problem is, this yields a ClassNotFoundException
on the marked line. 问题是,这会在标记的行上产生
ClassNotFoundException
。
(I tried all different combinations of -
and _
in the above file and the project.clj
. I still don't fully understand what requires an underscore and what tolerates a dash. Some things seem to roll with dashes and convert them as needed, whereas I know from messing around that in the -main
, I need underscores to reference test_proj.test
.) (我在上面的文件和
project.clj
尝试了-
和_
所有不同组合。我仍然不完全了解需要使用下划线和容忍破折号的功能。有些东西似乎会随破折号一起滚动,并根据需要进行转换,而我知道,从插科打诨,在-main
,我需要下划线参考test_proj.test
。)
If I go into the project root file, there's no target
folder, so it's not generating the class. 如果我进入项目的根文件,则没有
target
文件夹,因此不会生成类。 If I go into the terminal and run lein compile
, it generates the needed classes under target
, and the above code runs without error. 如果我进入终端并运行
lein compile
,它会在target
下生成所需的类,并且上面的代码运行没有错误。 This is a poor workaround though. 但是,这是一个较差的解决方法。 What if I modify the file and forget to manually recompile it?
如果我修改了文件却忘记了手动重新编译怎么办? It's also a pain to have to manually compile it after any time I do a
clean
. 我每次
clean
后都必须手动编译它也是一种痛苦。
As a shot in the dark, I tried using compile
right underneath the ns
macro: 在黑暗中拍摄时,我尝试在
ns
宏下面使用compile
:
(compile 'test-proj.test)
If I uses dashes, compile
seems to do literally nothing. 如果我使用破折号,那么
compile
似乎什么也没做。 I may be misinterpreting its use, but it doesn't generate class files under target
. 我可能会误解其用法,但它不会在
target
之下生成类文件。 If I use underscores, it gives an exception saying that the namespace isn't found. 如果使用下划线,则会出现异常,表明找不到名称空间。
Is there a way to have the classes generated automatically so I don't need to run lein compile
everytime? 有没有一种方法可以自动生成类,所以我不需要每次都运行
lein compile
? I thought that that's what the :aot
in the project.clj
did. 我认为这就是
project.clj
的:aot
所做的。
With Leiningen, specify :aot settings. 使用Leiningen,指定:aot设置。 :all is the easiest.
:all是最简单的。
project.clj project.clj
(defproject test-proj "0.1.0-SNAPSHOT"
:main test-proj.core
:aot :all
:dependencies [[org.clojure/clojure "1.8.0"]])
If you want, you can specify the exact namespaces in an array as seen below: 如果需要,可以在数组中指定确切的名称空间,如下所示:
project.clj project.clj
(defproject test-proj "0.1.0-SNAPSHOT"
:main test-proj.core
:aot [test-proj.core]
:dependencies [[org.clojure/clojure "1.8.0"]])
Then the following lein command: 然后执行以下lein命令:
lein compile
Will generate the byte code and .class files as specified in the :aot settings above. 将生成上述:aot设置中指定的字节码和.class文件。
core.clj core.clj
(ns test-proj.core
(:gen-class))
(defn -main[]
(println test_proj.core)
(println "Hello, World!"))
You want to see something like the below: 您想看到类似下面的内容:
NikoMacBook% lein compile
Compiling test-proj.core
Once this is done, check the target folder, contains the proper class file, here test_proj/core.class. 完成此操作后,检查目标文件夹,其中包含正确的类文件,此处为test_proj / core.class。
NikoMacBook% tree target
target
├── classes
│ ├── META-INF
│ │ └── maven
│ │ └── test-proj
│ │ └── test-proj
│ │ └── pom.properties
│ └── test_proj
│ ├── core$_main.class
│ ├── core$fn__38.class
│ ├── core$loading__5569__auto____36.class
│ ├── core.class
│ └── core__init.class
└── stale
└── leiningen.core.classpath.extract-native-dependencies
7 directories, 7 files
The following will run the :main namespace, so test-proj.core. 以下将运行:main命名空间,因此运行test-proj.core。
lein run
Will output 将输出
NikoMacBook% lein run
Compiling test-proj.core
Compiling test-proj.core
test_proj.core
Hello, World!
Note, that the class is calling itself. 注意,该类正在调用自身。 Note also that if you do not run lein compile beforehand , it will run by itself.
还请注意,如果您不预先运行lein compile,它将自行运行。
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