After updating ubuntu to 12.04 all fonts got bold. I haven't installed themes or configured fonts.
from netbeans about:
Product Version: NetBeans IDE 7.1 (Build 201112071828)
Java: 1.7.0_03; Java HotSpot(TM) 64-Bit Server VM 22.1-b02
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This is a bug:
EDIT: in the first link, there is a comment that will point you to another bug. There you can find the following solution: