编译jruby“Hello world”问题 [英] Compile jruby "Hello world" problem

问题描述

我已经用Ruby编程了一段时间，我真的很喜欢它。最近我开始需要编译一些ruby代码。由于几个原因使用Ruby2exe不是一个选择我。所以我决定给Jruby一个尝试（生成一个jar将是足够好的）。

我使用windows和我安装java JDK 6u17（在C：\Program

$ b p>

我创建了一个文件script.rb与：

我创建了一个hello世界在java，编译和执行它只是罚款/ p>

放置Hello，world

这个程序与jruby：

jruby script.rb

我已将JAVA_HOME设置为C：\Program Files\Java\jdk1.6.0_17

我也成功运行：

java -jar c：\jruby\lib\jruby.jar .rb

然后用命令编译：

jruby -S jrubyc script.rb

它会生成类'script.class'

我的问题是我没有办法正确执行script.class

我尝试：

java -cp：：c：\jruby\lib\jruby.jar script

我得到错误消息：

 线程main中的异常java.lang.NoClassDefFoundError：script 
 Caused by： java.lang.ClassNotFoundException：script 
在java.net.URLClassLoader $ 1.run（未知源）
在java.security.AccessController.doPrivileged（本地方法）
在java.net.URLClassLoader .findClass（未知源）
 at java.lang.ClassLoader.loadClass（未知源）
 at sun.misc.Launcher $ AppClassLoader.loadClass（未知源）
 at java.lang.ClassLoader .loadClass（未知源）
 at java.lang.ClassLoader.loadClassInternal（未知源）
找不到主类：script。程序将退出。 
  

我也试过将jruby-complete-1.4.0.jar复制到本地dir以及其他几个

任何人都知道我做错了什么？

解决方案

假设你在windows上，我认为你的-cp参数是错误的：它应该是分号分隔：

java -cp。 ：\jruby\lib\jruby.jar script

但是，我通过单独设置CLASSPATH env更好的运气，例如：

  
 C：\ruby> set CLASSPATH = c：\Program Files\jruby- 0\lib\jruby.jar; 
 
 C：\ruby> java hello_world 
你好，世界！ 
  

但也许这是因为我的类路径需要一个空格。

您使用的是什么版本的JRuby？正如你所看到的，我在1.4。

I have been programming for a while with Ruby and I really enjoy it. Lately I started having the need of compiling some ruby code. For several reasons using Ruby2exe is not an option for me. So I decided to give Jruby a try (generating a jar would be good enough).

I am using windows and I installed java JDK 6u17 (at C:\Program Files\Java\jdk1.6.0_17).

I installed jruby 1.4 at C:\jruby

I created a hello world in java, compile and executed it just fine (so java works fine).

I created a file "script.rb" with:

puts "Hello, world"

I run this program with jruby:

jruby script.rb

And it works fine.

I did set JAVA_HOME to C:\Program Files\Java\jdk1.6.0_17

I also successfully run:

java -jar c:\jruby\lib\jruby.jar script.rb

I then compile with the command:

jruby -S jrubyc script.rb

It generates the class 'script.class'

My problem is that I found no way to properly execute script.class

I try:

java -cp .:c:\jruby\lib\jruby.jar script

And I get the error message:

Exception in thread "main" java.lang.NoClassDefFoundError: script
Caused by: java.lang.ClassNotFoundException: script
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: script.  Program will exit.

I also tried copying jruby-complete-1.4.0.jar to local dir as well as several other options.

Anyone know what am I doing wrong?

解决方案

Assuming you are on windows, I think your -cp arg is wrong: it should be semi-colon delimited:

java -cp .;c:\jruby\lib\jruby.jar script

But also, I had better luck by setting the CLASSPATH env separately, e.g.:

C:\ruby>set CLASSPATH=c:\Program Files\jruby-1.4.0\lib\jruby.jar;

C:\ruby>java hello_world
Hello, world!

But perhaps that's because my classpath needs a space in it.

What version of JRuby are you using? As you can see, I'm on 1.4.

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