How To Set the Transparency of a JavaCompon​ent(jRange​Slider)

I want to overlay two jRangeSliders, disabling the first one and setting the second transparent so that both are visible.

So far, I've played around with the java.awt.Color() values for quite a bit, but the transparency never works well.

slider.setBackground(java.awt.Color(1, 1, 1, 0.1))

does very scary things to my code, and I have no idea why additional buttons and badly placed sliders are randomly generated from it.

How do I make a slider's background transparent?

[Kairui Zeng]

No transparency works perfectly fine, and I've tried multiple Color() parameter formats. The only problem now is that when I set alpha to 0, the interface bugs out like crazy.