JSpinner is not matching with the native spinner like, the background color of the jspinner where the value is display is white, but where the native is different , its a textfield.
The arrow buttons are combined, but where as in native there is one pixel gap between the arrow buttons.
 I have attached the screen shots.

Step to Reproduce:
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1) Run swingset2.
2) Select "ColorChooser" demo.
3) select "HSB" tab.
4) Observe that Jspinner as described above.

I tested this on java 1.6.0 & there update release & jdk1.7.0 b14.