[jboss-user] [Installation, Configuration & DEPLOYMENT] - Re: [3.2.3] [NoClassDefFoundError] Weird exception although

[jaikiran]

"nicdo77" wrote : Well, this leads me to another question.
  | I already had hibernate2.jar packaged in my ear. BUT, at deployment time, i used to have a deployment failure cause JBoss couldn't find one of the Hibernate class. 

Where in the ear did you place the hibernate jar file?

"nicdo77" wrote : 
  | 
  | Does it seem normal to you to have twice hibernate2.jar? 
  | Nico.

Each application is allowed to have its own version of libraries. This means that there might be more than one version of the same jar file in a JBoss system. But you have to be careful about how you setup the classloading configurations. Read through the following links which might give you some idea on classloading in JBoss:

http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossClassLoadingUseCases

http://wiki.jboss.org/wiki/Wiki.jsp?page=ClassLoadingConfiguration

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