Buildr中buildr eclipse命令不解

最近看Jruby语言实战技术，其中用到了buildr，就照着中所说的做，但是下载了buildr，
当执行buildr eclipse命令时，并不像书中所说的会在当前工程的子工程中创建 .classpath 和 .project 文件。
看了buildr官方的User Guide是这样描述的：
The eclipse task will generate a .classpath and .project file for each of projects
(and sub-project) that compiles source code. It will not generate files for other
projects, for examples, projects you use strictly for packaging a distribution, or
creating command line scripts, etc.
项目的目录结构是这样的，

CODE:

D:\JRUBY_WORK\CH03\BUILDR-JRUBY
│  buildfile
│
└─m_buildrbuildfile是这样的

CODE:

# Generated by Buildr 1.3.3, change to your liking
# Version number for this release
VERSION_NUMBER = "1.0.0"
# Group identifier for your projects
GROUP = "buildr-jruby"
COPYRIGHT = ""

# Specify Maven 2.0 remote repositories here, like this:
repositories.remote << "http://www.ibiblio.org/maven2/"

desc "The Buildr-jruby project"
define "buildr-jruby" do

  project.version = VERSION_NUMBER
  project.group = GROUP
  manifest["Implementation-Vendor"] = COPYRIGHT
       
        define "m_buildr" do
                compile
                package :jar
        end
end运行buildr eclipse 后不会在m_buildr目录下产生  .classpath 和 .project 文件。
请高人指点，谢谢