解决ivy is not available

今天用Ant编译Lucene时抛出错误：

ivy is not available

原来是缺少一个ivy插件，ivy插件是用来智能管理dependency的。项目主页是http://ant.apache.org/ivy/ ，只需将ivy-version.jar放入下列目录即可：

/usr/share/ant/lib
${HOME}/.ant/lib

不过既然在用ant，那么不妨用ant自动将ivy放入它该去的地方。新建一个编译脚本：

<project name="demo" default="resolve" xmlns:ivy="antlib:org.apache.ivy.ant">

    <target name="bootstrap" description="Install ivy">
        <mkdir dir="${user.home}/.ant/lib"/>
        <get dest="${user.home}/.ant/lib/ivy.jar" src="http://search.maven.org/remotecontent?filepath=org/apache/ivy/ivy/2.3.0/ivy-2.3.0.jar"/>
    </target>

    <target name="resolve" description="Use ivy to resolve classpaths">
        <ivy:resolve/>

        <ivy:report todir='build/ivy-reports' graph='false' xml='false'/>

        <ivy:cachepath pathid="compile.path" conf="compile"/>
        <ivy:cachepath pathid="test.path"    conf="test"/>
    </target>

    <target name="clean" description="Cleanup build files">
        <delete dir="build"/>
    </target>

    <target name="clean-all" depends="clean" description="Additionally purge ivy cache">
        <ivy:cleancache/>
    </target>

</project>

然后一句ant bootstrap就完工了。

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