[xwiki-users] Installation fails with Glassfish 3.0.1

Dear Group, after following the guide on http://platform.xwiki.org/xwiki/bin/view/AdminGuide/InstallationGlassFish I seem to be getting an error message (see below); so far I have tried installation using GlassFish 3.0.1 on Amazon Linux and Ubuntu 11.04: both times I get the error. Any ideas? Do I have to set up a database first? Thank you in advance for useful hints, Sandor -- Error message start --- type Exception report message descriptionThe server encountered an internal error () that prevented it from fulfilling this request. exception javax.servlet.ServletException: com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize main XWiki context Wrapped Exception: Error number 3001 in 3: Cannot load class com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from param xwiki.store.migration.manager.class Wrapped Exception: Error number 0 in 3: Exception while hibernate execute Wrapped Exception: Could not create a DBCP pool. There is an error in the hibernate configuration file, please review it. root cause com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize main XWiki context Wrapped Exception: Error number 3001 in 3: Cannot load class com.xpn.xwiki.store.migration.hibernate.XWikiHibernateMigrationManager from param xwiki.store.migration.manager.class Wrapped Exception: Error number 0 in 3: Exception while hibernate execute Wrapped Exception: Could not create a DBCP pool. There is an error in the hibernate configuration file, please review it. note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 3.0.1 logs. --- Error message end ---