java - understanding of spring bean scopes in a web application -

as per springsource documentation singleton scoped bean instantiated once per
container. example have singleton scoped userdetails bean contains information
user.
in main() method:

applicationcontext context = new classpathxmlapplicationcontext(new string[] {"spring-customer.xml"});   userdetails ud1 = (userdetails)context.getbean("userdetails");   custa.setaddress("address set ud1");   system.out.println("address : " + ud1.getaddress());    userdetails ud2 = (userdetails)context.getbean("userdetails");   system.out.println("address : " + ud2.getaddress()); 

the output

address set ud1   address set ud1 

because of userdetails singleton bean, second retrieval ud2 give same result of ud1.

now here problem:
web application have following userdetails bean in dispatcher-servlet.xml.

<bean id="userdetails" class="com.mukund.dto.userdetails" />   

first question: singleton scope default web application ?
if yes:
bean autowired accountservice , customerservice classes.
if client clienta has set first name of user "usera" in customerservice class , after time retrieves first name accountservice class,

second question: same instance of userdetails "usera" first name ?
third question: in mean time if client clientb tries first name in accountservice class "usera" ?
fourth question: same userdetails instance shared clienta, clientb , others ? if yes: scope choose prototype, request or session.

i hope understand point. please explain me spring bean scopes regards web application.

thanks

yes singleton default scope web applications. same instance of userdetails in services (and users).

what scope right 1 depends on want. want inject data transfer object services? how long should object exist?

• prototype scope: each service gets own userdetails object
• request scope: same instance time of request
• session scope: same instance long in same session.