$ ruby -v
jruby 9.0.0.0.pre1 (2.2.0p0) 2015-01-22 1e31288 Java HotSpot(TM) 64-Bit Server VM 24.55-b03 on 1.7.0_55-b13 +jit [darwin-x86_64]
$ jrubyc --help
NameError: missing class or uppercase package name (`org.jruby.compiler.impl.StandardASMCompiler'), caused by (NameError) cannot load Java class org.jruby.compiler.impl.StandardASMCompiler
  get_proxy_or_package_under_package at org/jruby/javasupport/JavaUtilities.java:54
                      method_missing at file:/Users/yuki/.rvm/rubies/jruby-9.0.0.0-pre1/lib/jruby.jar!/jruby/java/java_package_module_template.rb:14
                              (root) at /Users/yuki/.rvm/rubies/jruby-9.0.0.0-pre1/lib/ruby/stdlib/jruby/compiler.rb:10
                              (root) at /Users/yuki/.rvm/rubies/jruby-9.0.0.0-pre1/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
                             require at org/jruby/RubyKernel.java:954
                             require at /Users/yuki/.rvm/rubies/jruby-9.0.0.0-pre1/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:54
                              (root) at /Users/yuki/.rvm/rubies/jruby-9.0.0.0-pre1/lib/ruby/stdlib/jruby/jrubyc.rb:1
                             require at org/jruby/RubyKernel.java:954
                              (root) at /Users/yuki/.rvm/rubies/jruby-9.0.0.0-pre1/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
                          __script__ at /Users/yuki/.rvm/rubies/jruby-9.0.0.0-pre1/bin/jrubyc:3

$ ruby -v
jruby 1.7.18 (1.9.3p551) 2014-12-22 625381c on Java HotSpot(TM) 64-Bit Server VM 1.7.0_55-b13 +jit [darwin-x86_64]
$ jrubyc --help
jrubyc [options] (FILE|DIRECTORY)

  -d, --dir DIR            Use DIR as the base path
  -p, --prefix PREFIX      Prepend PREFIX to the file path and package. Default is no prefix.
  -t, --target TARGET      Output files to TARGET directory
  -J OPTION                Pass OPTION to javac for javac compiles
  -5                        --jdk5
                           Generate JDK 5 classes (version 49)
      --java               Generate .java classes to accompany the script
      --javac              Generate and compile .java classes to accompany the script
  -c CLASSPATH,            Add a jar to the classpath for building
      --classpath
      --sha1               Compile to a class named using the SHA1 hash of the source file
      --handles            Also generate all direct handle classes for the source file
      --verbose            Log verbose output while compile