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Differen types of spring bean scopes


In the spring bean configurations, bean attribute called 'scope' defines what kind of object has to created and returned. There are 5 types of bean scopes available, they are:

1) singleton: Returns a single bean instance per Spring IoC container.

2) prototype: Returns a new bean instance each time when requested.

3) request: Returns a single instance for every HTTP request call.

4) session: Returns a single instance for every HTTP session.

5) global session: global session scope is equal as session scope on portlet-based web applications.

If no bean scope is specified in bean configuration file, then it will be by default 'singleton'.

Here is an example for specifying bean scope configuration:

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
	
    <!-- Since scope is not defined, it assigns default value 'singleton'.
     It creates only one instance per spring IoC. -->
	<bean id="articleBean" class="com.java2novice.bean.Article" />
	
	<!-- Since scope is prototype, it creates and returns ColorBean for every 
	call-->
	<bean id="clrBean" class="com.java2novice.bean.ColorBean" scope="prototype"/>
	
	<bean id="ticketBean" class="com.java2novice.bean.TicketManager" scope="singleton"/>
    
</beans>
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Knowledge Centre
Can we call servlet destory() from service()?
As you know, destory() is part of servlet life cycle methods, it is used to kill the servlet instance. Servlet Engine is used to call destory(). In case, if you call destory method from service(), it just execute the code written in the destory(), but it wont kill the servlet instance. destroy() will be called before killing the servlet instance by servlet engine.
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