[NETCONF-664] The ConcurrentModificationException was found in the websocket test in restconf-nb-rfc8040.

Sun, 3 May 2020 02:48:38 +0000

The specific code in AbstractCommonSubscriber.java is as follows. When the yang notification is monitored, the websocket message is sent.

/**code**/

synchronized void post(final String data) {

for (final WebSocketSessionHandler subscriber : subscribers) {

final Optional<InetSocketAddress> remoteEndpointAddress = subscriber.getRemoteEndpointAddress();

if (remoteEndpointAddress.isPresent()) {

subscriber.sendDataMessage(data);

LOG.debug("Data was sent to subscriber {} on address {}:", this, remoteEndpointAddress.get());

} else {

// removal is probably not necessary, because it will be removed explicitly soon after invocation of

// onWebSocketClosed(..) in handler; but just to be sure ...

subscribers.remove(subscriber);

LOG.debug("Subscriber for {} was removed - web-socket session is not open.", this);

}

In the process of traversing the set, delete the element, will cause ConcurrentModificationException.

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