Spring - Websockets - JSR-356 - spring

Question

I implemented websockets into my application. I copied the configuration and dependencies from jHipster generated app, but I am getting the following errors:
java.lang.IllegalArgumentException: No 'javax.websocket.server.ServerContainer' ServletContext attribute. Are you running in a Servlet container that supports JSR-356?
and
org.apache.catalina.connector.ClientAbortException: java.io.IOException: An established connection was aborted by the software in your host machine
I believe these errors are the reason for the socket connection not being consistent and the therefore the client is not able to send and/or receive any messages.
I searched for a solution but other post didn't help (ie. adding glassfish dependencies).
These are my ws dependencies:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-messaging</artifactId>
</dependency>
Do I need to include some other dependencies or is the problem elsewhere?

Answer 1

I found a solution here.
I added these 2 beans:
#Bean
public TomcatServletWebServerFactory tomcatContainerFactory() {
TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();;
factory.setTomcatContextCustomizers(Collections.singletonList(tomcatContextCustomizer()));
return factory;
}
#Bean
public TomcatContextCustomizer tomcatContextCustomizer() {
return new TomcatContextCustomizer() {
#Override
public void customize(Context context) {
context.addServletContainerInitializer(new WsSci(), null);
}
};
}