java beginner

hai a i'm beginner 2 java...

i want to fetch data from database using combo box(drop down list) without using javascript...when i click list(ex:countrys should b selected)selected country should get inserted into db and should show list of countrys from db which i never give names n that should take from db..i,e fetched from db only...

n also give me a good example of using httpsession n for wat it s used ???

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