I am encountering this error (java.lang.NoClassDefFoundError: org/hibernate/cfg/HbmBinder$SecondPass) when I try to get a Hibernate session using the follow code:

Configuration cfg = new Configuration();
cfg.addClass(test.Widget.class);

The NoClassDefFoundError only occurs when I am running it inside a servlet in Tomcat. If I am running the exact same code in a standalone static main(), it works perfectly.

This is hibernate 3.1.2, and I have all the jars (including annotation) in my path.

Any help will be appreciated.