JPA Glassfish Database Update Issue

Question

I have an application deployed on Glassfish v3.0.1 which reads events from a table in my database. Once ready it marks them as processed. I am getting a strange error I can\

Answer 1

On Glassfish 3.1.2 at least, sometimes a previous iteration of a bean that has changed will choke Glassfish at deployment. The app will run until it gets to whatever bit of code that should be called but can't be because the previously deployed class is still there. I think Glassfish might keep track of each and prevent the new code from calling the old code, but I haven't really been that keen to worry about it as the solution is simple enough:

Stop the server, go to the domain directory and delete all the files and sub-directories in the application directory. Then do the same in the generated and osgi-cache directories. Restart the server and rebuild/redeploy.