Your eclipse instance doesn't have the jar files in the lib directory of your hadoop installation in the class path.
On Sat, Nov 14, 2009 at 7:51 PM, felix gao <gre1...@gmail.com> wrote: > I wrote a simple code in my eclipse as > > Text t = new Text("hadoop"); > System.out.println((char)t.charAt(2)); > > when I try to run this I got > > Exception in thread "main" java.lang.NoClassDefFoundError: > org/apache/commons/logging/LogFactory > at org.apache.hadoop.io.Text.<clinit>(Text.java:49) > at com.example.io.WritableIOExample.main(WritableIOExample.java:44) > Caused by: java.lang.ClassNotFoundException: > org.apache.commons.logging.LogFactory > at java.net.URLClassLoader$1.run(URLClassLoader.java:200) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:188) > at java.lang.ClassLoader.loadClass(ClassLoader.java:307) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) > at java.lang.ClassLoader.loadClass(ClassLoader.java:252) > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) > ... 2 more > > The library used are Haddop 0.20.1 and log4j-1.2.15 > > Thanks for helping > -- Pro Hadoop, a book to guide you from beginner to hadoop mastery, http://www.amazon.com/dp/1430219424?tag=jewlerymall www.prohadoopbook.com a community for Hadoop Professionals