Neven, Thanks for the suggestions. We'd hoped we could just move this app over to Tomcat pretty easily, but yeah, we'll probably have to get the developer more involved. I'll check out the things that you suggested though. Is there any substitute for the JBossTransactionManager that could be used in Tomcat and configured in hibernate.cfg.xml? Thanks,
David -----Original Message----- From: Neven Cvetkovic <neven.cvetko...@gmail.com> To: Tomcat Users List <users@tomcat.apache.org> Sent: Thu, Apr 4, 2013 12:43 pm Subject: Re: Trouble loading MS SQl Server database driver in Tomcat 7.0.37 Hey David, I've misread that earlier - this is *java.lang.NoClassDefFoundError* - which means the class that was available at the compile time is not available now to the JVM. I suspect it might be a problem with your * com.systemsmadesimple.hibernate.HibernateUtil* class implementation. As per specification (JSE 12.4.2 Detailed Initialization Procedure http://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.4.2) says: "5. If the Class object for C is in an erroneous state, then initialization is not possible. Release LC and throw a NoClassDefFoundError." Now, for some reason that class worked fine on JBoss (that has hibernate and other required libraries packaged already), and now it is failing on Tomcat. I would look into the following things: 1. Contents of the WEB-INF/lib? What libraries? What versions? 2. Contents of CATALINA_HOME/lib? What else is there other than standard libraries? 3. HibernateUtil class implementation 4. How your transaction manager has been configured? This is just a wild guess, it might be that your developers leveraged transaction manager in the static initializer of HibernateUtil class, and that worked on JBoss since *JBossTransactionManagerLookup* is configured in your hibernate.cfg.xml file - now it is failing in Tomcat, and somehow other exceptions/errors are consumed/hidden in try-catch blocks in HibernateUtil class. Do you have access to the HibernateUtil source code? Who is building/packaging this application for you? Hope that helps! Cheers! Neven
