e764c8d897
Two concurrent threads should not send a message on a single WebSocket session at the same time, for example see: http://docs.oracle.com/javaee/7/api/javax/websocket/RemoteEndpoint.Basic.html In StompSubProtocolHandler it is quite possible that multiple messages may be broadcast to a single WebSocket client concurrently. This change adds synchronization around the sending of a message to a specific cilent session. Issue: SPR-11023