String too long, how to auto-truncate it?

Is there any general purpose add-on which can detect a string is
too long to insert/update for a database field, and truncate the
string to insert/update instead of getting ORA-01401 exception?

I strongly suggest you don't truncate data going into your database. Data in the database should be complete (and valid). Better to limit a user's input to the size of the field in the database by such methods as only providing an input field of x character size so he can't type in too many characters. If a user types in data and its retrieved truncated, he's going to be mad.
The question is, how large should a column be? If you set the max size to the max size if your current data set, then a future data value may be too large. I don't know the answer to this, but I suggest you be consistent for the same type of columns in multiple tables. For example, if you set the email address to 255 characters in one table, it should be the same in all tables.
See: http://www.javapractices.com/topic/TopicAction.do?Id=211

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