I have an application which was developed in Netbeans using hibernate. It works ok in windows server, but in Linux server it does not work. the error is shown below. The connection is broken due to the error happens when I try to use the database.
I used netbeans 6.5 as IDE and MySql as database.

Description: An unhandled exception occurred during the execution of the web application. Please review the following stack trace for more information regarding the error.

Exception Details: java.lang.NoClassDefFoundError
Could not initialize class SimulES.Control.HibernateUtil

Possible Source of Error:
Class Name: SimulES.Control.PlayerController
File Name: PlayerController.java
Method Name:
Line Number: 44

Source not available. Information regarding the location of the exception can be identified using the exception stack trace below.

Stack Trace:

SimulES.Control.PlayerController.(PlayerController.java:44)