Erro ao iniciar a aplicação! Urgente!

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class br.com.servicos.hibernate.HibernateUtil

br.com.servicos.hibernate.HibernateThreadFilter.doFilter(HibernateThreadFilter.java:63)

org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

root cause

java.lang.NoClassDefFoundError: Could not initialize class br.com.servicos.hibernate.HibernateUtil

br.com.servicos.hibernate.HibernateThreadFilter.doFilter(HibernateThreadFilter.java:24)

org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

note The full stack trace of the root cause is available in the JBossWeb/2.0.0.GA logs.

Alguem sabe o que pode ser?