On 27/10/2015 19:15, Farzad Panahi wrote:
> Hi,
>
> I am using tomcat 8.0.23 to terminate my websocket connections. I have
> the following code to take care of the incoming messages:
>
> @OnMessage
> public void onMsg(Session session, byte[] request) {
> executorService.execute(() ->
> session.getAsyncRemote().sendBinary(
> ByteBuffer.wrap(getResponse(session,
> request)), result -> {
> if (!result.isOK()) {
> LOGGER.catching(result.getException());
> }
> }
> ));
> }
>
> But I get the following exception:
>
> Exception in thread "pool-6-thread-10160"
> java.lang.IllegalStateException: The remote endpoint was in state
> [BINARY_FULL_WRITING] which is an invalid state for called method
> at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase$StateMachine.checkState(WsRemoteEndpointImplBase.java:1148)
> at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase$StateMachine.binaryStart(WsRemoteEndpointImplBase.java:1101)
> at
> org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendBytesByCompletion(WsRemoteEndpointImplBase.java:152)
> at
> org.apache.tomcat.websocket.WsRemoteEndpointAsync.sendBinary(WsRemoteEndpointAsync.java:65)
>
> From what I understand from java doc, RemoteEndpoint.Async.sendBinary
> should not throw IllegalStateException:
>
>> sendBinary void sendBinary(ByteBuffer data, SendHandler handler)
>> Throws: IllegalArgumentException - if either the data or the handler are
>> null.
>
> It is also good to note that RemoEndpoint.Basic (not
> RemoteEndpoint.Async) has the following paragraph in java doc:
>
>> If the websocket connection underlying this RemoteEndpoint is busy sending a
>> message when a call is made to send another one, for example if two threads
>> attempt to call a send method concurrently, or if a developer attempts to
>> send a new message while in the middle of sending an existing one, the send
>> method called while the connection is already busy may throw an
>> IllegalStateException.
>
>
> Is this expected behaviour from tomcat or a possible implementation bug?
The behaviour is expected. You can't start a new message until the
previous one has finished.
Mark
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