How can i know that the application is written in a correct way???

Dear sirs...
it seems a little silly, but assume that i wrote an applicaion, how can i
1- be sure that its performance is good, i.e. did i designed the application to be fast?
2- if it is using SSL, how can i make sure the performance is high?
3- before the applicaion is installed should i use any specific tuning?
4- should i do some tuning to the database,& as? i know how to install the AS, & DB, and how to make the application work, but i want it to work as good as possible
thanks for any help & happy new year
regards

you need load testing tool for that...
you can test your application with "Web Performance Trainer".. it supports ssl, multiple users (up to 5000 simultaneous), etc...
i use it and it is very good... anyway i havent try it with UIX only plain JSP but i think it shoud work with UIX too...
ofcourse you have to load database with lots of dummy records to have valid results...
my expirience is that for single standallone oc4j instance on heavy load maximum is 50-100 simultaneous users over ssl aes-256 (but load testing tool, oc4j and db are on the same computer which have only 2 GB of ram, and DB is only light loaded with with several hundred records, and each of those 50-100 concurent users have its own login name, each on its own separate SSL chanel.. so encryption load is really really heavy) on real deplyment system performance should be much much gerater, because DB, AS, and OC4J's should be on diferent machines each...

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