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Check that you are invoking fireTableCellUpdated() with the right arguments.

If you continue to have problems post a small example that illustrates the problem. It needn't have all the rest of...

Listening for changes (strictly speaking, changes in the underlying data model not it's visual representation: the table cell) is covered in the Listening for Data Changes section of "How to Use...

It might help to post a simple example that compiles and illustrates the problem.

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private String[] heading;
private String[][] data;

public DataTable (String[] h, String[][] data){