springIOC: Beans Configuration file

 The objects that form the backbone of your application and that are managed by the Spring IOC container are called beans. A bean is an object that is instantiated, assembled and managed by Spring IOC container.

 The beans are created with the configuration metadata provided in the form of XML. The bean definition contains the information called configuration metadata which is needed for the container to know the following items:

                       How to create a bean

                       Bean’s life cycle details

                       Bean’s dependencies

All the above configuration metadata translates into a set of the following properties that makeup each bean definition.

Class – This attribute is mandatory and specifies which bean class to be used

Scope – This attribute specifies the scope of the object

Name/ID – This attribute specifies the bean identifier uniquely. We use either id.name to specify the bean identifier(s).

Constructor–arg – This is used to inject the dependency using constructor

properties – This is used to inject the dependencies using setters

Autowiring mode – This is used to inject the dependencies

Lazy-intialization mode – A lazy-initialized bean tells the IOC container to create a bean instance when it is first requested rather than at start up of the application

Initialization method – A callback to be called just after all necessary properties on the bean have set by the container.

Destruction method – A callback to be called when the container containing the bean is destroyed.

   <!-- A simple bean definition -->

   <bean id="..." class="...">

       <!-- collaborators and configuration for this bean go here -->

   </bean>

   <!-- A bean definition with lazy init set on -->

   <bean id="..." class="..." lazy-init="true">

       <!-- collaborators and configuration for this bean go here -->

   </bean>

 <!-- A bean definition with initialization method -->

   <bean id="..." class="..." init-method="...">

       <!-- collaborators and configuration for this bean go here -->

   </bean>

   <!-- A bean definition with destruction method -->

   <bean id="..." class="..." destroy-method="...">

       <!-- collaborators and configuration for this bean go here -->

   </bean>

<!-- A bean definition with initialization  with scope  -->

   <bean id="..." class="..."  scope="...">

       <!-- collaborators and configuration for this bean go here -->

   </bean>

<!-- A bean definition with inheritance  -->

   <bean id="..." class="..."  parent="...">

       <!-- collaborators and configuration for this bean go here -->

   </bean>

   <!-- more bean definitions go here -->

</beans>