[doc] AbstractDispatcherServletInitializer support DispatcherServlet from Root Context [SPR-16041]

[spring-projects-issues]

Rob Winch opened SPR-16041 and commented

It would be nice if AbstractDispatcherServletInitializer made it simple to register the DispatcherServlet using the root ApplicationContext

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Affects: 4.3.11, 5.0 GA

Issue Links:

• AbstractAnnotationConfigDispatcherServletInitializer does not allow consolidating all configuration into the "root" context [SPR-11357] #15982 AbstractAnnotationConfigDispatcherServletInitializer does not allow consolidating all configuration into the "root" context

Referenced from: commits 32d78e6

[spring-projects-issues]

Rossen Stoyanchev commented

Note that the sub-class AbstractAnnotationConfigDispatcherServletInitializer has already allowed this for quite some time (see #15982). So all that any sub-class would have to do is create an instance of a WebApplicationContext. We could probably pre-implement createServletApplicationContext to do just that and feature more prominently the fact that you can put all configuration in the root context.

[spring-projects-issues]

Rob Winch commented

Rossen Stoyanchev I must have messed something up previously because the use case I wanted appears to work. For example, the following does appear to work:

public class WebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
	@Override
	protected Class<?>[] getRootConfigClasses() {
		return new Class[] { WebMvcConfig.class, SecurityConfig.class };
	}

	@Override
	protected Class<?>[] getServletConfigClasses() {
		return null;
	}

	@Override
	protected String[] getServletMappings() {
		return new String[] { "/" };
	}
}

[spring-projects-issues]

Rossen Stoyanchev commented

I've done updates to the Javadoc and reference to better document how to have a single application context in both Java config and web.xml. Aside from that everything works as expected.