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Wait ... calm. ;)
The first thing that is not really "good" is the CoinTable.getSize() for the scrollPane preferred size. At that time, the real size (getSize() ) of JTable is surely small (or even...

JTable must be inserted as a "view" into JScrollPane (generally it's sufficient new JScrollPane(yourTable) but there is also the setViewportView method to set the component to scroll). And scrollbars...