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JTable, JTextField and focus

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I have a JTable with cells backed by JTextFields:

Now I want the user to be able to enter text in the focused/selected
textfield simply by tabbing to that cell.
How can I cause editing to commence immediately when the user navigates
to a cell with the keyboard?
I have already tried several solutions:
- Calling requestFocus() on prev.getNext() (see above, second for-loop)
- Calling requestFocusInWindow() on prev.getNext() with the result that the requestFocusInWindow-method returns false
- Calling transferFocus() had no effect
- Calling DefaultKeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent() had no effect either.

Can anybody help me?

Don't get me started about those stupid light bulbs.
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