EclipseLink JPA in Eclipse dumb error message
Sometimes you’re developing an app along with a new database schema to go with it, but you get this:
Schema "null" cannot be resolved for table "XXXX".
Window -> Preferences -> Validation, JPA Validator, turn off for Build.
This probably shouldn’t be on by default anyhow, people are most likely going to build new apps from scratch than build new apps to fit old databases; and even if they do build from old, Eclipse’s JPA Tools has a build entities from tables function.