Java jruby-complete.jar的Gem安装

我正在尝试为jruby 1.7.4安装gems。我正在使用Ruby的Java实现，该实现作为程序（脚本API）的一部分提供。 以下是我在命令提示符下键入的命令：

java -Xmx500M -jar lib\jruby-complete.jar --command gem install builder --user-install

以下是我遇到的错误：

RuntimeCache.java:658:in `<clinit>': java.lang.NoClassDefFoundError: org/jcoding
s/Encoding

    from Ruby.java:216:in `<init>'
    from Ruby.java:275:in `newInstance'
    from Main.java:262:in `internalRun'
    from Main.java:221:in `run'
    from Main.java:201:in `main'

RuntimeCache.java:658:in`:java.lang.NoClassDefFoundError:org/jcoding
s/编码
来自Ruby.java:216:in`'
来自Ruby.java:275:in'newInstance'
来自Main.java:262:in'internalRun'
from Main.java:221:in'run'
from Main.java:201:in'Main'

原因：

null:-1:in `run': java.lang.ClassNotFoundException: org.jcodings.Encoding

    from null:-1:in `run'
    from null:-2:in `doPrivileged'
    from null:-1:in `findClass'
    from null:-1:in `loadClass'
    from null:-1:in `loadClass'
    from null:-1:in `loadClass'
    from RuntimeCache.java:658:in `<clinit>'
    from Ruby.java:216:in `<init>'
    from Ruby.java:275:in `newInstance'
    from Main.java:262:in `internalRun'
    from Main.java:221:in `run'
    from Main.java:201:in `main'

null:-1:在“运行”中：java.lang.ClassNotFoundException:org.jcodings.Encoding
from null:-1:在“run”中
from null:-2:在'doPrivileged'中
from null:-1:“findClass”中的
from null:-1:“loadClass”中的
from null:-1:“loadClass”中的
from null:-1:“loadClass”中的
来自RuntimeCache.java:658:in`'
来自Ruby.java:216:in`'
来自Ruby.java:275:in'newInstance'
来自Main.java:262:in'internalRun'
from Main.java:221:in'run'
from Main.java:201:in'Main'

我解决了我的问题。下面是我用来安装gems的更新命令：

java-Xmx500M-classpath lib\jcodings.jar；lib\joda-time.jar；lib\jruby-complete.jar org.jruby.Main--命令gem安装gem--用户安装