Empty space in JScrollPane

Hi,
I have placed a JScrollPane with verticalScrollBar property set to AS_NEEDED. I have a JPane inside the JScrollPane with layOut property set to null.
When the form is not maximized, first half of the JPane is displayed and Vertical scrollbar is displayed. If I scroll down, after all controls, there is a huge empty space in the JPane, which is actually not there at design time. This happens even in the form maximized mode also.
Please help.

What I have noticed is, even if the VerticalScrollBarPolicy is set to AS_NEEDED, it is displaying the vertical scroll bar always! How to avoid that?

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