Spring inject bean into startup class during server start up

Question

My bean is :

@Component public class KidsServerStartUp implements ServletContextListener { UploadService uplService; @Autowired public void setUplService( UploadService uplService ) { this.uplService = uplService; } public void contextInitialized(ServletContextEvent event) { System.out.println ( uplService ); } }

In web.xml; I am firstly calling spring framework to set all beans ; then setting the startup listener :

<listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <listener> <listener-class>com.kids.util.KidsServerStartUp</listener-class> </listener>

uplService is getting printed as null !

You are saying OptimizeImages is injected to UploadService but your code suggestes UploadService is injected to OptimizeImages, which one is correct? Where is the task scheduling code written? — Arun P Johny
– Arun P Johny, Commented Jul 3, 2012 at 3:21
Arun, I have done some re-factoring above so that the problem is more obvious. Thanks for looking into it. — Deepak Singhal
– Deepak Singhal, Commented Jul 3, 2012 at 4:07

Community · Accepted Answer · 2017-05-23 12:27:52Z

I think what you are looking for is something like this post.

Since you are using a ServletContextListener spring context will not be used for the creation of the Listener class. But we can get access to the ApplicationContext using the ServletContext.

public class KidsServerStartUp implements ServletContextListener { public void contextInitialized(ServletContextEvent event) { final WebApplicationContext springContext = WebApplicationContextUtils.getWebApplicationContext(event.getServletContext()); UploadService uplService = springContext.getBean(UploadService.class); System.out.println ( uplService ); } }

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