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What is the use of parameter in @ModelAttribute?

 
Ranch Hand
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What does this "obj" do exactly?
 
Rancher
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Its a way to acces data from your jsppage in your controller. Say you have a form and you want to save the values of that form to the database, @ModelAtribute would be the way to go.
For example this a way to register I wrote a while back:

First in the get method you put your form in a map:



Then in the post method you can bind the map to a entity and save that entity to the database:



Hope this clarified it a bit...
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