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Hiber nate execution do not occur

From: <glassfish_at_javadesktop.org>
Date: Mon, 22 Sep 2008 09:11:17 PDT

I am a new comer for the hibernate , I am running my first program using netbeans6.1 with hibernate3.0.I carefully configure the hibernate. everything is good but i do not understand why it is not run. during runtime i got the following error..

Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
Exception in thread "main" java.lang.ExceptionInInitializerError
        at InitSessionFactory.<clinit>(InitSessionFactory.java:40)
        at Main.main(Main.java:18)
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
        at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:110)
        at InitSessionFactory.<clinit>(InitSessionFactory.java:36)
        ... 1 more
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:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
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