Antialiasing for GTK L&F should be turned on by default if there is no embedded bitmap.

If attached sample program is executed on Solaris nevada,
there is no problem about font quality because embeded bitmap font
is used (see HGPGothic.png). HG-PGothicB-Sun has 13 dot embedded bitmap in it.
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% env LC_ALL=ja_JP.UTF-8 java -jar dist/DesktopApplication1.jar
Font = javax.swing.plaf.FontUIResource[family=HG-PGothicB-Sun,name=HG-PGothicB-Sun,style=plain,size=13]
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However, it is executed on Indiana, font quality is not good because
font is rendered by outline without antialiasing on (see ipag.png).
IPA has no 13 dot embedded bitmap in it.
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% env LC_ALL=ja_JP.UTF-8 java -jar dist/DesktopApplication1.jar
Font = javax.swing.plaf.FontUIResource[family=IPAPGothic,name=IPAPGothic,style=plain,size=13]
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So I think that antialiasing should be turned on by default if font glyph is
rendered by outline (not embedded bitmap) to consider font quality.
I attached SwingSet2 result as SwingSet2_GTK_indiana.png when GTK style look & feel is selected.
Result is same with my sample program. This problem was first found when netbeans was used on indiana.
Also I found 6418032 which describes exactly same problem we encounted in indiana.
Indiana default Japanese font is IPA. So the situation is the same with Linux destro. From the following evalation,
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The logic has been updated so on FC5 and other non-Sun desktops AA will be applied.
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AA seems to be turned on FC5 and other non-Sun desktops. So same setting is also needed on indiana.