Groovy中使用葡萄与AntBuilder类加载器问题

问题描述

我想用常规的一小FTP脚本，发现这个帖子http://www.hhhhq.org/blog/2009/05/01/ftp-using-groovy-and-ant/
由于有几个依赖我想用葡萄。所有的依赖关系解决，在缓存present。但我不能让蚂蚁找到其他的库可选任务。
它总是说

I wanted to use groovy for a little ftp script and found this post http://www.hhhhq.org/blog/2009/05/01/ftp-using-groovy-and-ant/Since there were several dependencies I wanted to use Grape. All dependencies are resolved and present in the cache. But I can't get Ant to find the optional tasks in the other libs.It always says

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_HOME\lib
        -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的版本：1.6.5 JVM：1.6.0_15

Groovy Version: 1.6.5 JVM: 1.6.0_15

下面是我的源$ C ​​$ C

Here is my source code

@Grab(group='ant', module='ant', version='[1.6.5,)')
@Grab(group='ant', module='ant-nodeps', version='[1.0,)')
@Grab(group='ant', module='ant-apache-oro', version='[1.0,)')
@Grab(group='ant', module='ant-commons-net', version='[1.0,)')
@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()

正如你可以看到我怀疑是问题的类加载器，似乎
葡萄不注入依赖那里。
我怎样才能得到它的主意工作？

As you can see I suspect the classloader of being the problem, it seems thatGrape doesn't inject the dependencies there.Any idea of how I can get it to work?

推荐答案

您说得对怀疑的类加载器是问题的根源。作为您code已经揭示，该AntBuilder从RootLoader，不具有访问由@Grab注解加载的类装载。作为的节目，Groovy的1.7是要解决这一问题。

You're right suspecting the classloader to be the root of the problem. As your code already reveals, the AntBuilder is loaded from the RootLoader, that doesn't have access to the classes loaded by the @Grab annotation. As GROOVY-3730 shows, Groovy 1.7 is going to address this problem.

不过，您可以直接使用 groovy.grape.Grape.grab（地图依赖）方法，在其中您可以设置特定的类加载器应该解决您的问题用于装载的依赖关系：

However, you can solve your problem by directly using the groovy.grape.Grape.grab(Map dependency) method, in which you can set a specific classloader that should be used to load the dependencies:

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

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