The Java editor shows tons of invalid errors like
a) Duplicate generator named "..."
b) Duplicate query named.

These invalid errors are new. They are not present when using JBossTools 3.0.0.cr2. Also they are not present when using Eclipse 3.4.2, WTP 3.0.4 and the "Generic platform" for the JPA facet.

I'll provide 2 screenshots to illustrate the bad usability.