java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
	at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:173)
	at com.newspace.HDFSDemo.init(HDFSDemo.java:28)
	at com.newspace.HDFSDemo.main(HDFSDemo.java:86)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
	at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 3 more

是因爲少導入了commons-logging.jar，導入此jar問題則會解決！