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

来源：互联网发布：龙桃子淘宝下架编辑：程序博客网时间：2024/05/20 00:35

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