Groovy与Grape和AntBuilder类加载器问题

我想用groovy做一个小ftp脚本,发现这个帖子 http://www.hhhhq.org/blog/2009/05/01/ftp-using-groovy-and-ant/
由于有几个依赖项,我想使用Grape.所有依赖项都已解析并存在于缓存中.但我无法让Ant在其他库中找到可选任务.
它总是说

Caught: : Problem: failed to create task or type ftp
Cause: the class org.apache.tools.ant.taskdefs.optional.net.FTP was not found.
        This looks like one of Ant's optional components.
Action: Check that the appropriate optional JAR exists in
        -ANT_HOMElib
        -the IDE Ant configuration dialogs

Do not panic,this is a common problem.
The commonest cause is a missing JAR.

This is not a bug; it is a configuration problem

        at GrabTest.runMe(GrabTest.groovy:15)
        at GrabTest.run(GrabTest.groovy:26)

Groovy版本：1.6.5 JVM：1.6.0_15

这是我的源代码

@Grab(group='ant',module='ant',version='[1.6.5,)')
@Grab(group='ant',module='ant-nodeps',version='[1.0,module='ant-apache-oro',)') 
@Grab(group='ant',module='ant-commons-net',)') 
@Grab(group='apache-oro',module='jakarta-oro',version='[2.0.8,)')
@Grab(group='commons-net',module='commons-net',version='[1.4,)')
def runMe() {
    // works
    println getClass().getClassLoader().loadClass("org.apache.tools.ant.taskdefs.optional.net.FTP")

    def ant = new AntBuilder()

    println getClass().getClassLoader() //groovy.lang.GroovyClassLoader$InnerLoader
    println ant.getClass().getClassLoader() //org.codehaus.groovy.tools.RootLoader
    ant.ftp( server:"ftp.foo.com",userid:"user",password:"passwd",passive:"yes",verbose:"yes",remotedir:"/pub/incoming",binary:"yes" ) {
                fileset( dir:"." ) { include( name:"**/*.gz" ) }
            }
}

runMe()

正如你所看到的,我怀疑是类问题的类加载器
Grape不会在那里注入依赖项.
知道如何让它工作吗？

import groovy.grape.Grape;

Grape.grab(group:'ant',module:'ant',version:'1.6.5',classLoader:this.class.classLoader.rootLoader)
Grape.grab(group:'ant',module:'ant-nodeps',module:'ant-apache-oro',module:'ant-commons-net',classLoader:this.class.classLoader.rootLoader)
Grape.grab(group:'commons-net',module:'commons-net',version:'1.4.1',classLoader:this.class.classLoader.rootLoader)
Grape.grab(group:'oro',module:'oro',version:'2.0.8',classLoader:this.class.classLoader.rootLoader)