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面试准备

Spring Framework 面试题与答案

问题 21. What is the Core container module?

This module is provides the fundamental functionality of the spring framework. In this module BeanFactory is the heart of any spring-based application. The entire framework was built on the top of this module. This module makes the Spring container.

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问题 22. What are different modules in spring?

spring have seven core modules
1. The Core container module
2. Application context module
3. AOP module (Aspect Oriented Programming)
4. JDBC abstraction and DAO module
5. O/R mapping integration module (Object/Relational)
6. Web module
7. MVC framework module

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问题 23. What is Application context module?

The Application context module makes spring a framework. This module extends the concept of BeanFactory, providing support for internationalization (I18N) messages, application lifecycle events, and validation. This module also supplies many enterprise services such JNDI access, EJB integration, remoting, and scheduling. It also provides support to other framework.

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问题 24. What is difference between singleton and prototype bean?

Basically a bean has scopes which defines their existence on the application

Singleton: means single bean definition to a single object instance per Spring IOC container.

Prototype: means a single bean definition to any number of object instances.

Whatever beans we defined in spring framework are singleton beans. There is an attribute in bean tag named ‘singleton’ if specified true then bean becomes singleton and if set to false then the bean becomes a prototype bean. By default it is set to true. So, all the beans in spring framework are by default singleton beans.

<bean id="createNewStock" class="springexample.stockMarket.CreateNewStockAccont" singleton="false">
<property name="newBid"/>
</bean>

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问题 25. What is AOP module?

The AOP module is used for developing aspects for our Spring-enabled application. Much of the support has been provided by the AOP Alliance in order to ensure the interoperability between Spring and other AOP frameworks. This module also introduces metadata programming to Spring. Using Spring's metadata support, we will be able to add annotations to our source code that instruct Spring on where and how to apply aspects.

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