Solved: Why does JComboBox seem to add multiple item instances?

(log SwingUtilities. IsEventDispatchThread() if you're unsure). If it's any other thread, move your update into a Runnable and use SwingUtilities.invokeLater() to schedule it for execution on the EDT.

(log SwingUtilities. IsEventDispatchThread() if you're unsure). If it's any other thread, move your update into a Runnable and use SwingUtilities.invokeLater() to schedule it for execution on the EDT.

Try setSelectedItem(null) as part of your update.

Dumb mistake. Adding it twice (@Geoffrey). Taking too long to find the 2nd add in another class.My grandmother warned me not to get old.

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