JTextField listener when text changes that modifies textField's text

Question

Any idea how I can add a text listener on to a JTextField, that triggers when the text changes and as an action modifies the JTextField's text.

I have tried using addInputMethodListener which seems to be appropriate but it doesn't seem to work. I have also tried textField.getDocument().addDocumentListener() but this throws java.lang.IllegalStateException: Attempt to mutate in notification when I try to modify textField's text.

Answer 1

DocumentListeners do not permit the modification of the underlying document of the JTextComponent. You are looking for a DocumentFilter.

Example