A divider can be no less than one pixel in size.
// Create a left-right split pane
JSplitPane pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftComponent, rightComponent);
// Get current size; it is look and feel dependent
int size = pane.getDividerSize();
// Set a new size
size = 1;
pane.setDividerSize(size);
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