Spring – Bean Scopes

Bean scope is used to decide which type of bean instance should be return to the caller. Here’s 5 types of bean scopes supported :

• singleton – Return a single bean instance per Spring IoC container
• prototype – Return a new bean instance each time when requested
• request – Return a single bean instance per HTTP request. *
• session – Return a single bean instance per HTTP session. *
• globalSession – Return a single bean instance per global HTTP session. *

In most cases, you may only deal with the Spring’s core scope – singleton and prototype, and the default scope is singleton.

<bean id="customerService" class="com.mkyong.customer.services.CustomerService" scope="prototype"/>

Bean configuration file, no bean scope is specified, default to singleton.





<bean id="customerService" 
         class="com.mkyong.customer.services.CustomerService" />

It is same as :



<bean id="customerService" class="com.mkyong.customer.services.CustomerService" 
singleton="true"/>






Using Annotation:


@Service
@Scope("prototype")
public class CustomerService{}


Enable the auto scanning:


<context:component-scan base-package="com.mkyong.customer" />