SplitPane divide size is not correct in vertical split . When divide size is 100 it has to increase the size of the divider but it gives an impression that it have reduced the size of the second component. actually divider size has to be increased.
Step to reproduce:
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1) Run SwingSet2.
2) Select SplitPane demo .
3) Select Vertical Split.
4) Enter 50  in the divider size & observe that second component size is reduced.
I have attached the screen shots of the same.  It works fine for horizontal spite.