Spring - Websockets - JSR-356

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);
            }
        };
    }