[Tomcat] Tomcat call onClose several time when it fail to detect the connection is down

[jfarcand]

If Tomcat fails to detect the connection is closed, it will call onClose when trying to write a websocket message:

    at org.apache.catalina.websocket.StreamInbound.doOnClose(StreamInbound.java:226)
    at org.apache.catalina.websocket.WsOutbound.writeTextMessage(WsOutbound.java:229)
    at org.atmosphere.container.version.TomcatWebSocket.write(TomcatWebSocket.java:57)
    at org.atmosphere.websocket.WebSocket.write(WebSocket.java:222)

It may call it AGAIN if another message is trying to be written concurrently, causing Atmosphere to invoke the DefaultWebSocketProcessor.close several time causing all king of pollution in the logs.