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Choice between various java technologies(urgent)

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Hi guys,
This question may sound stupid but i do need help very confused.I am confused as to when i am suppose to use JSP& servlets or instead of JSP i can use Javascript & HTML.When should i use EJB instead of just a plain java class to do the same thin.
For e.g say
i have a module where i enter data about a customer in a form now should i develop the form in html or use awt/swing and then the input given to the form should be inserted into a database.So should i use EJB for inserting data into database or should i user servlets to pick up form data and insert into database.
If i use awt/swing how can i transfer the form contents when the data is submitted to servlet/ejb
and if i use ejb to insert data into database how do i get the form values into ejb.
Further when do i use multithreading in my module and how exaclty can i implement it.
Please help me with this as it is very urgent and i am too confused as to what to choose over what.
Thanx in advance
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