How to set vertical and horizontal scrollbars on a Java JScrollPane

If you want the horizontal and/or vertical scrollbars to always show on a Java JScrollPane, configure them like this:

scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

Other options are:

HORIZONTAL_SCROLLBAR_AS_NEEDED
HORIZONTAL_SCROLLBAR_NEVER

and:

VERTICAL_SCROLLBAR_AS_NEEDED
VERTICAL_SCROLLBAR_NEVER

See the ScrollPaneConstants Javadoc for more information.