This was reported by a customer, Myee Riri, on the Customer Portal discussion forum (https://access.redhat.com/discussions/3332721):

This

<dependency>
  <groupId>org.jboss.spec.javax.websocket</groupId>
  <artifactId>jboss-websocket-api_1.0_spec</artifactId>
  <version>1.0.0.Final</version>
  <scope>provided</scope>
</dependency>

should be

<dependency>
  <groupId>org.jboss.spec.javax.websocket</groupId>
  <artifactId>jboss-websocket-api_1.1_spec</artifactId>
  <scope>provided</scope>
</dependency>