How to use Servlet 3 @WebServlet & async with Spring MVC 3?

java spring spring-mvc long-polling servlet-3.0
Ben picture Ben · Jul 27, 2010 · Viewed 12.2k times · Source

I would like to integrate the servlet 3.0 async support with spring MVC. Something like:

@RequestMapping("/chat")
@WebServlet(name="myServlet", asyncSupported=true)
public String getMessage(String userName) {
      ......
}

is it possible?

Answer

Krish Bheeman picture Krish Bheeman · Oct 29, 2010

Not so fast, it is not that easy to implement good long polling. The method you mentioned works well, but there is a serious issue of "thread starvation"

Each Long polling will use up one thread, if you have 1000 concurrent user you would need 1000 thread to service the long polling request ( which most of the time does update of the server side status on the client browser)

Jetty 6 has a continue pattern whcih cleverly releases the thread of long polling request to be used by rhe real application logic.

Related questions

What's the difference between @Component, @Repository & @Service annotations in Spring?

Can @Component, @Repository and @Service annotations be used interchangeably in Spring or do they provide any particular functionality besides acting as a notation device? In other words, if I have a Service class and I change the annotation from @Service …

Read More
UnsatisfiedDependencyException: Error creating bean with name

For several days I'm trying to create Spring CRUD application. I'm confused. I can't solve this errors. org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'clientController': Unsatisfied dependency expressed through method 'setClientService' parameter 0; nested exception is org.springframework.…

Read More
@Autowired - No qualifying bean of type found for dependency

I've started my project by creating entities, services and JUnit tests for services using Spring and Hibernate. All of this works great. Then I've added spring-mvc to make this web application using many different step-by-step tutorials, but when I'm trying …

Read More