Nutch“java.lang.NoClassDefFoundError:”问题解决

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