How popular is Jtable?

Question

I have to fill out a table with bank data. But nothing appears at all.

My Class

Inserting information in the table:

 DefaultTableModel dtm = new DefaultTableModel();
    String sql = "select * from eventos";

ResultSet rs = null;
try {
rs = stmt.executeQuery(query);
} catch (SQLException ex) {
Logger.getLogger(folha.class.getName()).log(Level.SEVERE, null, ex);
}


try {
while (rs.next()) {
    //pega os valores do bd para popular tabela
    dtm.addRow(new String[] {rs.getString("codEvento"), rs.getString("descricaoEvento"), rs.getString("referencia"), rs.getString("vencimento"), rs.getString("desconto") });
}
}catch (SQLException ex) {
        Logger.getLogger(folha.class.getName()).log(Level.SEVERE, null, ex);
}