no actionEvent from JFormattedTextField without edit?
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After changing an app from java1.4.2 to java6_30 client complains about changed behaviour of some date input-field. field is subclassed from JFormattedTextField with a digit-mask to form a date/time (##.##.#### ##:##) - no problems here. 
problem (changed behaviour) is, that just pressing enter without any edit gives no actionEvent. Moving cursor, then enter : no actionEvent; Tab -> actionEvent; pressing one or more digits, enter -> actionEvent.
The actionEvent used to come through with java142. seems, in java6 the CommitAction is specifically disabled, when no edit was done. but why? the default behaviour of JTextField is enter -> actionEvent, no matter if there was an edit or not.
any ideas? explanation or workaround?