For others out there who encountered this issue, it's possible there is a problem with your schema.

I ran into this problem on a column that was originally defined one way and I made some changes. Java JPA is smart enough to understand these things but in my case I broke something and the only recourse was just regenerating my DB.

In production DON'T do this (obviously) but check to see your schema changes and see if something got broken by a recent update or something.

If you changed your entities make sure your relationships are wired up correctly and your property names are correctly mapped with getters/setters, etc.