Cleanup Eclipse JPA validation, etc. errors

[karlmdavis]

Since switching to Eclipse Java EE Luna, there are a number of Eclipse JPA validation errors cluttering up the Problems view.

An example of one such error: The Java class for mapped type "Account" is final.

These errors ought to be cleaned up, even though Hibernate doesn't actually care about them. I'm technically violating the JPA spec. Doesn't really matter whether or not I think the spec is stupid; I should follow it.

[karlmdavis]

I would estimate this issue as follows:

• 0.5h: Just go through and clean up the errors. There's nothing major needed here: just minor changes.

That's an estimate of 0.5h, total.

[karlmdavis]

My estimate was way off: ended up taking 6.75h, total.

Most of the overage was due to all of the Hibernate bugs I ended up encountering:

• HHH-9427: Errors when using mixed-case column name in @JoinColumn
• HHH-9430: Errors when using GenerationType.IDENTITY on PostgreSQL, when entity has more than one column
• HHH-9431: Errors with mixed-case sequence name