Why is Eclipse Juno 4.2 running “JPA Java Change Event Handler” processes?

Question

I have just upgraded to Eclipse Juno 4.2. I have a completely clean new workspace, but have imported projects that have previously been used in Eclipse 3.7 and therefore have so

Answer 1

I've experienced this behavior whenever I disabled the JPA Validator in Window => Preferences => Validation. Enabling it for both Build and Manual made the crazy loop disappear.