Today, I added a second managed bean to my application. I wrote the Java code and added the bean name, class, and persistence to my faces-config.xml file.
No matter what I did, as soon as tried to reference the bean, I would get an ClassNotFoundException. Basically the application was not seeing the reference in the faces-config file. I spent most of my energy thinking I somehow had improper syntax in the file.
A quick search found this Stack Overflow, and the comment by Mark Leusink did the trick. I did a Project | Clean in Eclipse, and the managed bean worked as expected. The Project | Clean will launch a window where you can choose any or all of the projects in your 'Application' window.
Hopefully this will be helpful to someone. I know I am going to try it whenever strange things are happening in my xpages projects. BTW: I am using Notes 9.