Question

I want to create a bean that has start() and stop() methods. When the webapp s context is active, start() is called during Spring s runtime bootup. When the webapp is undeployed or stopped, the stop() method is invoked.

Is this correct: I annotate my start() method with @PostConstruct and the stop() method with @PreDestroy ?

Normally in the servlet world, I write a ServletContextListener. Would I be able to access the ApplicationContext from the ServletContextListener ?

Answer 1

You can either annotate your start() and stop() methods as you describe, or you can tell Spring to invoke them explicitly, e.g.

<bean class="MyClass" init-method="start" destroy-method="stop"/>

As for the ServletContextListener, it would not have easy access to the Spring context. It s best to use Spring s own lifecycle to do your bean initialization.

Answer 2

Implement the Lifecycle or SmartLifecycle interfaces in your bean, as described in

http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/beans.html#beans-factory-lifecycle-processor

public interface Lifecycle {
  void start();
  void stop();
  boolean isRunning();
}

Your ApplicationContext will then cascade its start and stop events to all Lifecycle implementations. See also the JavaDocs:

http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/context/Lifecycle.html

http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/context/SmartLifecycle.html

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