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问题描述：执行爬网页命令时出现错误：

# ./bin/nutch crawl

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/nutch/crawl/Crawl Caused by: java.lang.ClassNotFoundException: org.apache.nutch.crawl.Crawl         at java.net.URLClassLoader$1.run(URLClassLoader.java:217)         at java.security.AccessController.doPrivileged(Native Method)         at java.net.URLClassLoader.findClass(URLClassLoader.java:205)         at java.lang.ClassLoader.loadClass(ClassLoader.java:319)         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)         at java.lang.ClassLoader.loadClass(ClassLoader.java:264)         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332) Could not find the main class: org.apache.nutch.crawl.Crawl. Program will exit.

 

原因：apache-nutch-1.2-src.tar.gz解压的文件夹这没有文件nutch-1.2.jar、nutch-1.2.job和nutch-1.2.war

 

解决方法：将apache-nutch-1.2-bin.tar.gz中的nutch-1.2.jar、nutch-1.2.job和nutch-1.2.war拷贝过来

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