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I know how to enable async support in a XML configuration, I have done so for filters and servlets by adding tag
async-supported>true/async-supported
How to do it in a Java config file. I create a WebInit class which implements WebApplicationInitializer and overrides onStartUp -what should I do next?
public class WebInit implements WebApplicationInitializer {
@Override
public void onStartup(ServletContext container) throws ServletException {
//What to do here, to move from XML to java config
}
}
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To enable the asynchronous processing, add the @EnableAsync annotation to the configuration class. The @EnableAsync annotation switches on Spring's ability to run @Async methods in a background thread pool.
Spring MVC async relies on Servlet APIs which only provides async behavior between container threads and request processing threads but not end to end. Spring WebFlux on the other hand achieves concurrency by a fixed number of threads by using HTTP sockets and pushing chunks of data at a time through the sockets.
@Async has two limitations: It must be applied to public methods only. Self-invocation — calling the async method from within the same class — won't work.
Along the following lines -
ServletRegistration.Dynamic registration = container.addServlet(servletName, myServlet);
registration.setAsyncSupported(true);
EDIT:
Sorry, did not realize that you were looking for a Spring specific solution. With Spring MVC you would just extend a AbstractAnnotationConfigDispatcherServletInitializer assuming that your root and web contexts are @Configuration based. This initializer in-turn extends from AbstractDispatcherServletInitializer, this class has asyncSupported flag set by default.
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