ant nutch报错

 https://repository.apache.org/content/repositories/snapshots/com/google/javascript/closure-compiler/v20130603/closure-compiler-v20130603.jar

[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::

[ivy:resolve] ::              FAILED DOWNLOADS            ::

[ivy:resolve] :: ^ see resolution messages for details  ^ ::

[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::

[ivy:resolve] :: org.restlet.jse#org.restlet.ext.jaxrs;2.2.3!org.restlet.ext.jaxrs.jar

[ivy:resolve] :: org.apache.commons#commons-collections4;4.0!commons-collections4.jar

[ivy:resolve] :: com.google.javascript#closure-compiler;v20130603!closure-compiler.jar

[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::

[ivy:resolve] :::: ERRORS

[ivy:resolve] Server access Error: 拒绝链接 url=http://repo1.maven.org/maven2/org/apache/commons/commons-collections4/4.0/commons-collections4-4.0.jar

[ivy:resolve] 

[ivy:resolve] :: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS

BUILD FAILED

/home/hadoop/nutch/build.xml:467: impossible to resolve dependencies:

resolve failed - see output for details

解决办法：

致使依赖的jar没法正常下载，编译失败。此问题的缘由是http://repo1.maven.org/maven2/不存在，解决方案是寻找能使用的资源库URL。通过测试http://mirrors.ibiblio.org/maven2/在浏览器下能够正常访问，用此URL替换\ivy目录下ivysettings.xml中的http://repo1.maven.org/maven2/，能够正常下载所依赖的jar包，编译成功。
<property name="repo.maven.org" value="http://repo1.maven.org/maven2/" override="false"/>

或者修改hosts文件，添加72.21.81.253    repo1.maven.org，该方法也能够解决下载问题