Hi, I was working on a project and all the sudden it started giving me null pointer exceptions for no clear reason, and I cannot figure out why. The guy on the mailing list told me to submit the project to Jira. The only things I can think that might be the cause is I was trying to figure out how to get many-to-many relationships to work, and inheritance, and so i kept modifying properties, which gave me database errors. So I finally just dropped all the tables in the database. And still I had this error. I've attached my project for you, including the stacktrace in it.