重新配置nutch1.2 报 Exception in thread "main" java.io.IOException: Job failed!
网上解决的办法都不行，原来是配置：
nutch-default.xml
//自己添加的时没有认真的原因造成的。
<property>
<name>plugin.folders</name>
<value>./src/plugins </value>
<description>Directories where nutch plugins are located. Each
element may be a relative or absolute path. If absolute, it is used
as is. If relative, it is searched for on the classpath.</description>
</property>
修改成：
<property>
<name>plugin.folders</name>
<value>./src/plugin</value>
<description>Directories where nutch plugins are located. Each
element may be a relative or absolute path. If absolute, it is used
as is. If relative, it is searched for on the classpath.</description>
</property>