Error while installing jruby on windows 7

Question

I am trying to install JRuby in my system, I follow the following steps:

• Download a copy of the latest JRuby from the JRuby download page.
• Unzip the file with your achive program. If you don't have one that works, download 7-Zip.
• Copy the JRuby folder called jruby-1.7.2 directly to "C:/"
• Set environment variables on your system. Right click "My Computer" go to "Advanced" then "Environmental Variables". Create these: JRUBY_HOME = C:/jruby-1.7.2
• Next you'll have to edit the PATH variable. Add ;C:\\jruby-1.1.5\\bin; to the end of that variable.

And then I am running the command:

C:\Users\sitanshu\rubyApp\jruby-1.7.2>jruby -v

then it shows the following error:

jruby 1.7.2 (1.9.3p327) 2013-01-04 302c706 on Java HotSpot(TM) Client VM 1.7.0-ea-b19 [Windows Vista-x86]
NameError: uninitialized constant Java::JavaLang::ProcessBuilder::Redirect
   const_missing at org/jruby/RubyModule.java:2677
  ProcessManager at file:/C:/Users/sitanshu/rubyApp/jruby-1.7.2/lib/jruby.jar!/jruby/kernel/jruby/process_manager.rb:12
           JRuby at file:/C:/Users/sitanshu/rubyApp/jruby-1.7.2/lib/jruby.jar!/jruby/kernel/jruby/process_manager.rb:6
          (root) at file:/C:/Users/sitanshu/rubyApp/jruby-1.7.2/lib/jruby.jar!/jruby/kernel/jruby/process_manager.rb:3
            load at org/jruby/RubyKernel.java:1046
          (root) at file:/C:/Users/sitanshu/rubyApp/jruby-1.7.2/lib/jruby.jar!/jruby/kernel.rb:1

So where am I going wrong and what is the solution for that?

Answer 1

我将测试Java是否已更新并正常工作

java -version

Answer 2

Under your environment variables, make sure you have a JAVA_HOME variable pointing to your JRE root folder, like this:

• C:\\Program Files\\Java\\jre7\\

Make sure your Java JRE bin folder is also part of your PATH variable:

• ;C:\\Program Files\\Java\\jre7\\bin\\

Additionally, when you are adding jruby to your PATH variable, make sure you are referencing the correct folder location. In the example you have given, you are installing jruby to C:\\jruby-1.7.2 , but then you are actually referring to this different folder C:\\jruby-1.1.5 in your PATH configuration.

Also, when you are defining your JRUBY_HOME variable, make sure you are using backslash \\ characters. In your example above you used a forward slash / character. Remember, that windows uses backslashes between folders.

Finally, after you've made all your environment variable changes, remember to open a new command window for your changes to take effect.