I am plugging in Spring to existing Java EE web Application. I have following lines in my web.xml:
<listener>
<listener-class>com.MyContextListener</listener-class>
</listener>
And Following MyContextListener class?
public class MyContextListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent event) {
//...
}
}
What should I do to make MyContextListener be managed by Spring?
Edited:
My assumption is: Spring should create all servlets and all web app infrastructure so everything happened in contextInitialized method of MyContextListener should be somehow handled by Spring. How can I achieve, by implementing some interface I suppose. Correct me if I am wrong. Thanks!
Well,
We had a similar scenario of configuring an exiting Jersey web services app to use Spring for dependency injection. Our Jersey webapp had extended ContextLoaderListener as follow
public class XServletContextListener extends ContextLoaderListener {
...
@Override
public void contextInitialized(ServletContextEvent arg0) {
super.contextInitialized(arg0);
....
}
@Override
public void contextDestroyed(ServletContextEvent arg0) {
super.contextDestroyed(arg0);
....
}
}
where ContextLoaderListener is
import org.springframework.web.context.ContextLoaderListener;
We included the jersey-spring bridge with all spring dependencies including applicationContext.xml as follow
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.xxx.*" />
....
....
</beans>
And obviously needed to make sure that XServletContextListener is included in the web.xml as follow
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>com.xxx.**.XServletContextListener</listener-class>
</listener>
Followed by servlet and its init-param values and servlet mapping. You can obviously adopt annotation config in place of xml confib in which case you would need to use WebListener annotation.
We use a variety of annotations such as
@Component for objects
@Service for services
@Repository for DAOs
@Controller for controllers/resources
@ContextConfiguration for tests
Everything is loaded and autowired by Spring framework.