Integrating Atmosphere with Spring MVC - spring-mvc

Question

I want to provide push notifications in a Spring MVC project, using JDK 1.6 targeting all browsers. I followed this post and finally decided to go with Atmosphere.
For Server-sent events, My server controller is (source):
#Controller
public class AtmosphereController {
#RequestMapping(value="/getTime", method=RequestMethod.GET)
#ResponseBody
public void websockets(final AtmosphereResource atmosphereResource) {
final HttpServletRequest request = atmosphereResource.getRequest();
final HttpServletResponse response = atmosphereResource.getResponse();
atmosphereResource.suspend();
final Broadcaster bc = atmosphereResource.getBroadcaster();
bc.scheduleFixedBroadcast(new Callable<String>() {
public String call() throws Exception {
return (new Date()).toString();
}
}, 10, TimeUnit.SECONDS);
}
}
While running, I got org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.atmosphere.cpr.AtmosphereResource]: Specified class is an interface.
In solution to this, I got this relevant post. I added this to my dispatcher-servlet.xml:
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
</list>
</property>
</bean>
<mvc:annotation-driven>
<mvc:argument-resolvers>
<bean id= "atmosphereResource"
class="org.atmosphere.cpr.AtmosphereResourceImpl" />
</mvc:argument-resolvers>
</mvc:annotation-driven>
Doing this, also results in a new error:
[cvc-complex-type.2.1: Element 'mvc:annotation-driven' must have no character or element information item [children], because the type's content type is empty.]
I've also tried this. Please help me inject AtmosphereResource in Spring Controller. Do I also need to update web.xml or some other configuration file to make it work or what part I'm missing. Please help!
Please also comment on other alternatives to provide Server-Side Events functionality. Thanks in advance!

Answer 1

Your argument-resolvers must be a class like this:
public class AtmosphereArgumentResolver implements HandlerMethodArgumentResolver {
#Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
HttpServletRequest httpServletRequest= webRequest.getNativeRequest(HttpServletRequest.class);
return Meteor.build(httpServletRequest).getAtmosphereResource();
}
#Override
public boolean supportsParameter(MethodParameter parameter) {
return AtmosphereResource.class.isAssignableFrom(parameter.getParameterType());
}
}
and try this:
<mvc:annotation-driven>
<mvc:argument-resolvers>
<bean class="com.yourpackage.AtmosphereArgumentResolver" />
</mvc:argument-resolvers>
</mvc:annotation-driven>

Answer 2

try Atmosphere 2.1.0-RC1 and following this document . All you need to do is to add the atmosphere-spring.jar to your dependency.
-- Jeanfrancois