Best way for manage pk's

I am using sequences for manage mi primary keys'. My application are using create method of the entity for get the next value for my PK, using technique explained in:
http://hasamali.blogspot.com/2011/04/adf-bc-various-way-of-setting-sequence.html
http://mjabr.wordpress.com/2011/03/11/make-sequence-number-as-default-value/
http://webapplicationdeveloper.blogspot.com/2012/03/adf-11g-get-sequence-in-groovy.html
Which do you think is the best way to manage mi primary key's
thanks in advance
greetings

That made me laugh out loud :) Who says the use of triggers is 'not best practice'? Must be a hardcore java programmer I guess.
I once saw an application have a separate table that had a row for each other table and the latest value of the primary key for this table. Every insert in a table was preceded with a select from that table, and an update to increment the latest value. That way unique values for the primary key were ensured. How about that?
p.s. PLEASE DON'T DO THAT

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