Skills421

Execute Code after Bean Initialized

• make Bean implement InitializingBean
• override method public void afterPropertiesSet()
• code is executed just after the properties have been set

Problem

• tightly coupled to Spring Framework

Execute Code before Bean is Destroyed

• make Bean implement DisposableBean
• override method public void destroy()
• code is executed just before the bean is destroyed

Problem

• tightly coupled to Spring Framework

De-coupled Callbacks

• write your own methods – e.g. myInit() and myDestroy()
• configure the spring.xml and add attributes to the bean as follows:

<bean id="mybean" class="..." init-method="myInit" destroy-method="myDestroy">
...
</bean>

Common De-coupled Callbacks

• write your own methods – e.g. myInit() and myDestroy()
• configure the spring.xml and add attributes as follows:

<beans default-init-method="myInit" default-destroy-method="myDestroy">
<bean id="mybean" class="...">
...
</bean>
...
</beans>

• Spring will try and run the default-init-method and default-destroy-method for every bean it configures.
• if Spring finds the myInit() method or the myDestroy() method, then it will run it, otherwise it will ignore it