Forcing jsr356 WebSocket Support - Atmosphere/atmosphere Wiki

If you want to force the use of jsr356 with Tomcat 7, Jetty 9.1.x or GlassFish 4, just add

       <init-param>
               <param-name>org.atmosphere.useNative</param-name>
               <param-value>false</param-value>
      </init-param>