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java.lang.IllegalArgumentException: message cannot be null	at org.eclipse.jetty.websocket.jsr356.AbstractJsrRemote.assertMessageNotNull(AbstractJsrRemote.java:69)	at org.eclipse.jetty.websocket.jsr356.JsrAsyncRemote.sendBinary(JsrAsyncRemote.java:61)	at com.apple.sample.websocket.endpoint.FileServer.onMessage(FileServer.java:56)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.eclipse.jetty.websocket.common.events.annotated.CallableMethod.call(CallableMethod.java:71)	at org.eclipse.jetty.websocket.jsr356.annotations.OnMessageTextCallable.call(OnMessageTextCallable.java:63)	at org.eclipse.jetty.websocket.jsr356.annotations.JsrEvents.callText(JsrEvents.java:197)	at org.eclipse.jetty.websocket.jsr356.endpoints.JsrAnnotatedEventDriver.onTextMessage(JsrAnnotatedEventDriver.java:378)	at org.eclipse.jetty.websocket.common.message.SimpleTextMessage.messageComplete(SimpleTextMessage.java:69)	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.appendMessage(AbstractEventDriver.java:66)	at org.eclipse.jetty.websocket.jsr356.endpoints.JsrAnnotatedEventDriver.onTextFrame(JsrAnnotatedEventDriver.java:360)	at org.eclipse.jetty.websocket.common.events.AbstractEventDriver.incomingFrame(AbstractEventDriver.java:162)	at org.eclipse.jetty.websocket.common.WebSocketSession.incomingFrame(WebSocketSession.java:376)	at org.eclipse.jetty.websocket.common.extensions.AbstractExtension.nextIncomingFrame(AbstractExtension.java:176)	at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.nextIncomingFrame(PerMessageDeflateExtension.java:105)	at org.eclipse.jetty.websocket.common.extensions.compress.CompressExtension.forwardIncoming(CompressExtension.java:142)	at org.eclipse.jetty.websocket.common.extensions.compress.PerMessageDeflateExtension.incomingFrame(PerMessageDeflateExtension.java:85)	at org.eclipse.jetty.websocket.common.extensions.ExtensionStack.incomingFrame(ExtensionStack.java:220)	at org.eclipse.jetty.websocket.common.Parser.notifyFrame(Parser.java:220)	at org.eclipse.jetty.websocket.common.Parser.parse(Parser.java:256)	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.readParse(AbstractWebSocketConnection.java:679)	at org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection.onFillable(AbstractWebSocketConnection.java:511)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)	at java.lang.Thread.run(Thread.java:745)