[Nutch] ant编译的问题

缺包问题：

Could not load definitions from resource org/sonar/ant/antlib.xml. It could not be found.   

解决方法:

1. 下载 sonar-ant-task-2.2.jar
2. 将其拷贝到 ${NUTCH_HOME}/lib 目录下面，并修改${NUTCH_HOME}/build.xml，在

<taskdef uri="antlib:org.sonar.ant" resource="org/sonar/ant/antlib.xml">  

下添加

<classpath><fileset dir="./lib" includes="sonar*.jar" /></classpath>  

编译卡顿：

一直出现在以下界面不动

resolve-default:    
[ivy:resolve] :: Apache Ivy 2.3.0 - 20130110142753 :: http://ant.apache.org/ivy/ ::    
[ivy:resolve] :: loading settings :: file = /opt/apache-nutch-2.3.1/ivy/ivysettings.xml  

解决方法：
可通过修改maven中央库地址来解决
修改${NUTCH_HOME}/ivy/ivysettings.xml中

<property name="repo.maven.org"    
    value="http://repo1.maven.org/maven2/"    
    override="false"/>  

value值改为国内阿里云的中央库地址：http://maven.aliyun.com/nexus/content/groups/public/

参考资料：
1. http://blog.csdn.net/maoersong/article/details/52201812