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How to add an additional connector in spring boot's application?
import org.apache.catalina.connector.Connector;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
import org.springframework.context.annotation.Bean;
public class SpringApplication {
public static void main(String[] args) {
new SpringApplicationBuilder(SpringApplication.class).run();
public ServletWebServerFactory servletContainer() {
TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
return tomcat;

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@lotabout lotabout commented Aug 26, 2019

Untitled Diagram

Say your main thread is blocking waiting for another service's callback. And the max worker thread number is 200. Then say

  • You received 200 requests, they are all blocking waiting for callback.
  • Now the callback request come but you have no more threads for processing it.
    So that your whole system is dead lock.

Thus we need to preserve some threads for our callback endpoint/controller.

The only way that I found is to create another connector(with another port) for the callback.

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