Learning Stateful session beans

[iwanabeguru]

Hi

I am learning stateful session beans, and I need some help and/or explanation.

I created a very simple stateful bean.

public @Stateful class AdderBean implements Adder {

	private int data=0;
	
	public int getData(){
		return data;
	}
	
	public void addData(int d){
		data = data+d;
	}

}

I created a client servlet which reads an integer parameter from a textbox field, call the addData method of the bean and print the incremented value.

I have some problems with this little test application. If i get the bean inside the doGet method its behave like a statless bean. It only contains the last inserted value. However if i get the bean in the constructor of the servlet it works like a singleton bean and if i test it in two different browser which maintains two different sessions I can modify only one value and it's shared between two browsers.

I want to increment the value in the bean through more then one call like it is a very simplified shoping cart bean.

How can i use this bean?
Should I have to put the bean reference into the Session object and get it for every call?

May i misunderstood the concept of the stateful session beans, I think i don not have to maintain session manually when I use enterprise beans.

Please, provide me a proper method or explanation.
Thank you for your help.

iwanabeguru